amd64_transform.c 59.9 KB
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/*
 * This file is part of libFirm.
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 * Copyright (C) 2012 University of Karlsruhe.
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 */

/**
 * @file
 * @brief   code selection (transform FIRM into amd64 FIRM)
 */
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#include "debug.h"
#include "error.h"
#include "heights.h"
#include "ircons.h"
#include "irgmod.h"
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#include "irgraph_t.h"
#include "irmode_t.h"
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#include "irnode_t.h"
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#include "iropt_t.h"
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#include "tv_t.h"
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#include "util.h"
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#include "benode.h"
#include "betranshlp.h"
#include "beutil.h"
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#include "bearch_amd64_t.h"
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#include "beirg.h"
#include "beabihelper.h"
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#include "besched.h"
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#include "amd64_cconv.h"
#include "amd64_new_nodes.h"
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#include "amd64_nodes_attr.h"
#include "amd64_transform.h"
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#include "../ia32/x86_address_mode.h"
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#include "gen_amd64_regalloc_if.h"

DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)

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typedef struct reg_info_t {
	size_t   offset;
	ir_node *irn;
} reg_info_t;

static ir_mode         *mode_gp;
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static ir_mode         *mode_flags;
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static amd64_cconv_t   *current_cconv = NULL;
static reg_info_t       start_mem;
static reg_info_t       start_sp;
static reg_info_t       start_fp;
static size_t           start_callee_saves_offset;
static size_t           start_params_offset;
static pmap            *node_to_stack;
static be_stackorder_t *stackorder;
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static const arch_register_req_t amd64_requirement_gp = {
	arch_register_req_type_normal,
	&amd64_reg_classes[CLASS_amd64_gp],
	NULL,
	0,
	0,
	1
};

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#define BIT(x)    (1u << x)

static const arch_register_req_t amd64_requirement_gp_same_0 = {
	arch_register_req_type_normal | arch_register_req_type_should_be_same,
	&amd64_reg_classes[CLASS_amd64_gp],
	NULL,
	BIT(0),
	0,
	1
};

static const arch_register_req_t amd64_requirement_gp_same_0_not_1 = {
	arch_register_req_type_normal | arch_register_req_type_should_be_same
	| arch_register_req_type_must_be_different,
	&amd64_reg_classes[CLASS_amd64_gp],
	NULL,
	BIT(0),
	BIT(1),
	1
};

static const unsigned amd64_limited_gp_rcx [] = { BIT(REG_GP_RCX) };
static const arch_register_req_t amd64_requirement_rcx = {
	arch_register_req_type_limited,
	&amd64_reg_classes[CLASS_amd64_gp],
	amd64_limited_gp_rcx,
	0,
	0,
	1
};

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static const unsigned amd64_limited_gp_rax [] = { BIT(REG_GP_RAX) };
static const arch_register_req_t amd64_requirement_rax = {
	arch_register_req_type_limited,
	&amd64_reg_classes[CLASS_amd64_gp],
	amd64_limited_gp_rax,
	0,
	0,
	1
};

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static const arch_register_req_t *mem_reqs[] = {
	&arch_no_requirement,
};

static const arch_register_req_t *reg_mem_reqs[] = {
	&amd64_requirement_gp,
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	&arch_no_requirement,
};

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static const arch_register_req_t *reg_reg_mem_reqs[] = {
	&amd64_requirement_gp,
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	&amd64_requirement_gp,
	&arch_no_requirement,
};

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static const arch_register_req_t *reg_reg_reg_mem_reqs[] = {
	&amd64_requirement_gp,
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	&amd64_requirement_gp,
	&amd64_requirement_gp,
	&arch_no_requirement,
};

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static const arch_register_req_t *reg_reg_reqs[] = {
	&amd64_requirement_gp,
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	&amd64_requirement_gp,
};

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static const arch_register_req_t *rax_reg_reqs[] = {
	&amd64_requirement_rax,
	&amd64_requirement_gp,
};

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static const arch_register_req_t *reg_reqs[] = {
	&amd64_requirement_gp,
};

static const arch_register_req_t *reg_rcx_reqs[] = {
	&amd64_requirement_gp,
	&amd64_requirement_rcx,
};

static inline bool mode_needs_gp_reg(ir_mode *mode)
{
	return get_mode_arithmetic(mode) == irma_twos_complement;
}

static bool is_downconv(const ir_node *node)
{
	if (!is_Conv(node))
		return false;

	ir_mode *dest_mode = get_irn_mode(node);
	if (!mode_needs_gp_reg(dest_mode))
		return false;
	ir_mode *src_mode = get_irn_mode(get_Conv_op(node));
	if (!mode_needs_gp_reg(src_mode))
		return false;
	return get_mode_size_bits(dest_mode) <= get_mode_size_bits(src_mode);
}

static ir_node *skip_downconv(ir_node *node)
{
	while (is_downconv(node)) {
		if (get_irn_n_edges(node) > 1)
			break;
		node = get_Conv_op(node);
	}
	return node;
}

static bool is_sameconv(const ir_node *node)
{
	if (!is_Conv(node))
		return false;
	ir_mode *dest_mode = get_irn_mode(node);
	if (!mode_needs_gp_reg(dest_mode))
		return false;
	ir_mode *src_mode = get_irn_mode(get_Conv_op(node));
	if (!mode_needs_gp_reg(src_mode))
		return false;
	return get_mode_size_bits(dest_mode) == get_mode_size_bits(src_mode);
}

static ir_node *skip_sameconv(ir_node *node)
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{
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	while (is_sameconv(node)) {
		if (get_irn_n_edges(node) > 1)
			break;
		node = get_Conv_op(node);
	}
	return node;
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}

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static ir_node *get_reg(ir_graph *const irg, reg_info_t *const reg)
{
	if (!reg->irn) {
		/* this is already the transformed start node */
		ir_node *const start = get_irg_start(irg);
		assert(is_amd64_Start(start));
		arch_register_class_t const *const cls
			= arch_get_irn_register_req_out(start, reg->offset)->cls;
		reg->irn = new_r_Proj(start, cls ? cls->mode : mode_M, reg->offset);
	}
	return reg->irn;
}

static ir_node *get_initial_sp(ir_graph *irg)
{
	return get_reg(irg, &start_sp);
}

static ir_node *get_initial_fp(ir_graph *irg)
{
	return get_reg(irg, &start_fp);
}

static ir_node *get_initial_mem(ir_graph *irg)
{
	return get_reg(irg, &start_mem);
}

static ir_node *get_frame_base(ir_graph *irg)
{
	if (current_cconv->omit_fp) {
		return get_initial_sp(irg);
	} else {
		return get_initial_fp(irg);
	}
}
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static ir_node *gen_Const(ir_node *node)
{
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	ir_node  *block = be_transform_node(get_nodes_block(node));
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	dbg_info *dbgi  = get_irn_dbg_info(node);
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	ir_mode  *mode  = get_irn_mode(node);
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	if (!mode_needs_gp_reg(mode))
		panic("amd64: float constant not supported yet");
	ir_tarval *tv = get_Const_tarval(node);
	uint64_t val = get_tarval_uint64(tv);
	amd64_insn_mode_t imode = val > UINT32_MAX ? INSN_MODE_64 : INSN_MODE_32;
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	return new_bd_amd64_MovImm(dbgi, block, imode, val, NULL);
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}

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typedef enum reference_mode_t {
	REFERENCE_DIRECT,
	REFERENCE_IP_RELATIVE,
	REFERENCE_GOT,
} reference_mode_t;

static reference_mode_t need_relative_addressing(const ir_entity *entity)
{
	if (!be_options.pic)
		return REFERENCE_DIRECT;

	/* simply everything is instruction pointer relative, external functions
	 * use a global offset table */
	return entity_has_definition(entity)
	   && (get_entity_linkage(entity) & IR_LINKAGE_MERGE) == 0
	    ? REFERENCE_IP_RELATIVE : REFERENCE_GOT;
}

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static ir_node *gen_Address(ir_node *node)
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{
	ir_node   *block  = be_transform_node(get_nodes_block(node));
	dbg_info  *dbgi   = get_irn_dbg_info(node);
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	ir_entity *entity = get_Address_entity(node);
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	/* do we need RIP-relative addressing because of PIC? */
	reference_mode_t mode = need_relative_addressing(entity);
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	if (mode == REFERENCE_DIRECT)
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		return new_bd_amd64_MovImm(dbgi, block, INSN_MODE_64, 0, entity);

	amd64_addr_t addr;
	memset(&addr, 0, sizeof(addr));
	addr.base_input  = RIP_INPUT;
	addr.index_input = NO_INPUT;
	addr.mem_input   = NO_INPUT;
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	if (mode == REFERENCE_IP_RELATIVE) {
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		addr.immediate.entity = entity;
		return new_bd_amd64_Lea(dbgi, block, 0, NULL, INSN_MODE_64, addr);
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	} else {
		assert(mode == REFERENCE_GOT);
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		addr.immediate.entity = new_got_entry_entity(entity);
		ir_node *load = new_bd_amd64_Mov(dbgi, block, 0, NULL, AMD64_OP_ADDR,
		                                 INSN_MODE_64, addr);
		return new_r_Proj(load, mode_gp, pn_amd64_Mov_res);
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	}
}

typedef ir_node *(*construct_binop_func)(dbg_info *dbgi, ir_node *block,
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	int arity, ir_node *in[], const amd64_binop_addr_attr_t *attr_init);
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typedef ir_node *(*construct_rax_binop_func)(dbg_info *dbgi, ir_node *block,
	int arity, ir_node *in[], amd64_insn_mode_t insn_mode,
	amd64_op_mode_t op_mode, amd64_addr_t addr);

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typedef enum match_flags_t {
	match_am           = 1 << 0,
	match_mode_neutral = 1 << 1,
	match_immediate    = 1 << 2,
	match_commutative  = 1 << 3,
} match_flags_t;

typedef struct amd64_args_t {
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	amd64_binop_addr_attr_t     attr;
	ir_node                    *mem_proj;
	ir_node                    *in[4];
	int                         arity;
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	const arch_register_req_t **reqs;
} amd64_args_t;

static amd64_insn_mode_t get_insn_mode_from_mode(const ir_mode *mode)
{
	switch (get_mode_size_bits(mode)) {
	case  8: return INSN_MODE_8;
	case 16: return INSN_MODE_16;
	case 32: return INSN_MODE_32;
	case 64: return INSN_MODE_64;
	}
	panic("unexpected mode");
}

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static bool match_immediate_32(amd64_imm32_t *imm, const ir_node *op,
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                               bool can_match_ip_relative,
                               bool upper32_dont_care)
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{
	assert(mode_needs_gp_reg(get_irn_mode(op)));
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	assert(imm->offset == 0 && imm->entity == NULL);
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	if (is_Const(op)) {
		ir_tarval *tv = get_Const_tarval(op);
		if (!tarval_is_long(tv))
			return false;
		long    lval = get_tarval_long(tv);
		int32_t val  = (int32_t)lval;
		if ((long)val != lval)
			return false;
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		/** the immediate value is signed extended to 64bit, sometimes
		 * this is not what we want. */
		if (!upper32_dont_care && val < 0
		    && !mode_is_signed(get_tarval_mode(tv)))
		    return false;
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		imm->offset = val;
		return true;
	} else if (can_match_ip_relative && is_Address(op)) {
		/* TODO: check if entity is in lower 4GB address space/relative */
		ir_entity *entity = get_Address_entity(op);
		imm->entity = entity;
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		return true;
	}
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	/* TODO: SymConst, Add(SymConst, Const) ... */
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	return false;
}

static ir_heights_t *heights;

static bool source_am_possible(ir_node *block, ir_node *node, ir_node *other)
{
	if (!is_Proj(node))
		return false;
	ir_node *load = get_Proj_pred(node);
	if (!is_Load(load))
		return false;
	assert(get_Proj_proj(node) == pn_Load_res);
	if (get_nodes_block(load) != block)
		return false;
	/* make sure we are the only user */
	if (get_irn_n_edges(node) != 1)
		return false;
	/* ia32 backend claims this can happen, use an assert for now and see
	 * if we hit it :) */
	assert(!be_is_transformed(node));
	/* make sure the other input does not depend on the load */
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	if (other != NULL && get_nodes_block(other) == block
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	    && heights_reachable_in_block(heights, other, load))
		return false;

	return true;
}

static bool needs_extension(ir_node *op)
{
	ir_mode *mode = get_irn_mode(op);
	if (get_mode_size_bits(mode) >= 32)
		return false;
	return !be_upper_bits_clean(op, mode);
}

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static bool use_address_matching(match_flags_t flags, ir_node *block,
                                 ir_node *op1, ir_node *op2,
                                 ir_node **out_load, ir_node **out_op)
{
	bool flags_match = flags & match_am;

	if (flags_match && source_am_possible(block, op2, op1)) {
		(*out_load) = get_Proj_pred(op2);
		(*out_op)   = op1;
		return true;
	} else if (flags_match && (flags & match_commutative)
               && source_am_possible(block, op1, op2)) {
		(*out_load) = get_Proj_pred(op1);
		(*out_op)   = op2;
		return true;
	}
	return false;
}

static void perform_address_matching(const ir_node *load, int *arity,
                                     ir_node **in, amd64_addr_t *addr,
                                     const arch_register_req_t ***reqs)
{
	ir_node *ptr = get_Load_ptr(load);
	x86_address_t maddr;
	memset(&maddr, 0, sizeof(maddr));

	x86_create_address_mode(&maddr, ptr, x86_create_am_entities_ip_relative);
	assert(maddr.frame_entity == NULL);
	*reqs = reg_mem_reqs;

	if (maddr.base != NULL) {
		int base_input   = (*arity)++;
		addr->base_input = base_input;
		in[base_input]   = be_transform_node(maddr.base);
		*reqs             = reg_reg_mem_reqs;
	} else if(maddr.entity != NULL) {
		addr->base_input = RIP_INPUT;
	} else {
		addr->base_input = NO_INPUT;
	}
	if (maddr.index != NULL) {
		int index_input = (*arity)++;
		addr->index_input = index_input;
		in[index_input]  = be_transform_node(maddr.index);
		*reqs              = maddr.base != NULL
			                           ? reg_reg_reg_mem_reqs
			                           : reg_reg_mem_reqs;
	} else {
		addr->index_input = NO_INPUT;
	}
	ir_node *mem           = get_Load_mem(load);
	ir_node *new_mem       = be_transform_node(mem);
	int      mem_input     = (*arity)++;
	in[mem_input]          = new_mem;
	addr->mem_input        = mem_input;
	addr->immediate.entity = maddr.entity;
	addr->immediate.offset = maddr.offset;
	addr->log_scale        = maddr.scale;
}

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static void match_binop(amd64_args_t *args, ir_node *block,
                        ir_mode *mode, ir_node *op1, ir_node *op2,
                        match_flags_t flags)
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{
	memset(args, 0, sizeof(*args));

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	bool use_am;
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	bool use_immediate = flags & match_immediate;
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	bool mode_neutral  = flags & match_mode_neutral;
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	unsigned mode_bits = get_mode_size_bits(mode);
	if (mode_bits == 8 || mode_bits == 16)
		use_am = false;
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	args->attr.base.insn_mode = get_insn_mode_from_mode(mode);
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	/* TODO: legalize phase */
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	if (mode_neutral) {
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		op1 = skip_downconv(op1);
		op2 = skip_downconv(op2);
	} else {
		/* TODO: extend inputs? */
		(void)needs_extension;
	}

	ir_node *load;
	ir_node *op;
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	use_am = use_address_matching(flags, block, op1, op2, &load, &op);

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	if (use_immediate
	    && match_immediate_32(&args->attr.u.immediate, op2, false, mode_neutral)) {
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		/* fine, we found an immediate */
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		args->attr.base.base.op_mode = AMD64_OP_REG_IMM;
		args->in[args->arity++]      = be_transform_node(op1);
		args->reqs                   = reg_reqs;
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	} else if (use_am) {
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		ir_node *new_op        = be_transform_node(op);
		int      reg_input     = args->arity++;
		args->attr.u.reg_input = reg_input;
		args->in[reg_input]    = new_op;
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		amd64_addr_t *addr     = &args->attr.base.addr;
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		perform_address_matching(load, &(args->arity), args->in, addr,
				                 &(args->reqs));

		args->mem_proj               = be_get_Proj_for_pn(load, pn_Load_M);
		args->attr.base.base.op_mode = AMD64_OP_ADDR_REG;
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	} else {
		/* simply transform the arguments */
		args->in[args->arity++] = be_transform_node(op1);
		args->in[args->arity++] = be_transform_node(op2);
		args->reqs              = reg_reg_reqs;
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		args->attr.base.base.op_mode = AMD64_OP_REG_REG;
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	}
}

static ir_node *gen_binop_am(ir_node *node, ir_node *op1, ir_node *op2,
                             construct_binop_func func, match_flags_t flags)
{
	ir_node *block = get_nodes_block(node);
	ir_mode *mode  = get_irn_mode(node);
	amd64_args_t args;
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	match_binop(&args, block, mode, op1, op2, flags);
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	dbg_info *const dbgi      = get_irn_dbg_info(node);
	ir_node  *const new_block = be_transform_node(block);

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	ir_node *new_node = func(dbgi, new_block, args.arity, args.in, &args.attr);
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	arch_set_irn_register_reqs_in(new_node, args.reqs);
	arch_set_irn_register_req_out(new_node, 0, &amd64_requirement_gp_same_0);

	if (args.mem_proj != NULL) {
		ir_node *load = get_Proj_pred(args.mem_proj);
		be_set_transformed_node(load, new_node);
	}

	return new_r_Proj(new_node, mode_gp, pn_amd64_Sub_res);
}

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/* Transform arguments for a binop using RAX and register as input */
static void gen_binop_rax_reg(ir_node *op1, ir_node *op2, ir_node **in,
                              int *arity, amd64_op_mode_t *op_mode,
                              const arch_register_req_t ***reqs)
{
	in[(*arity)++] = be_transform_node(op1);
	in[(*arity)++] = be_transform_node(op2);
	*reqs          = rax_reg_reqs;
	*op_mode       = AMD64_OP_RAX_REG;
}

static ir_node *gen_binop_rax(ir_node *node, ir_node *op1, ir_node *op2,
                              construct_rax_binop_func make_node,
                              match_flags_t flags)
{
	bool use_am;
	bool mode_neutral  = flags & match_mode_neutral;
	assert(! (flags & match_immediate));

	ir_mode *mode = get_irn_mode(op1);

	unsigned mode_bits = get_mode_size_bits(mode);
	if (mode_bits == 8 || mode_bits == 16)
		use_am = false;
	amd64_insn_mode_t insn_mode = get_insn_mode_from_mode(mode);

	/* TODO: legalize phase */
	if (mode_neutral) {
		op1 = skip_downconv(op1);
		op2 = skip_downconv(op2);
	} else {
		/* TODO: extend inputs? */
		(void)needs_extension;
	}

	ir_node *load;
	ir_node *op;
	ir_node *mem_proj;
	ir_node *block = get_nodes_block(node);
	ir_node *in[4];
	int      arity = 0;
	const arch_register_req_t **reqs;
	amd64_op_mode_t op_mode;
	amd64_addr_t    addr;
	memset(&addr, 0, sizeof(addr));

	use_am = use_address_matching(flags, block, op1, op2, &load, &op);
	if (use_am) {
		ir_node *new_op    = be_transform_node(op);
		int      reg_input = arity++;
		in[reg_input]      = new_op;

		perform_address_matching(load, &arity, in, &addr, &reqs);

		mem_proj                = be_get_Proj_for_pn(load, pn_Load_M);
		op_mode                 = AMD64_OP_RAX_ADDR;
	} else {
		/* simply transform the arguments */
		gen_binop_rax_reg(op1, op2, in, &arity, &op_mode, &reqs);
	}

	(void)mem_proj;
	dbg_info *dbgi      = get_irn_dbg_info(node);
	ir_node  *new_block = be_transform_node(block);
	ir_node  *new_node  = make_node(dbgi, new_block, arity, in, insn_mode,
	                                op_mode, addr);
	arch_set_irn_register_reqs_in(new_node, reqs);
	return new_node;
}

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typedef ir_node *(*construct_shift_func)(dbg_info *dbgi, ir_node *block,
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	int arity, ir_node *in[], const amd64_shift_attr_t *attr_init);
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static ir_node *gen_shift_binop(ir_node *node, ir_node *op1, ir_node *op2,
                                construct_shift_func func, match_flags_t flags)
{
	ir_mode *mode = get_irn_mode(node);
	assert(!mode_is_float(mode));

	if (get_mode_modulo_shift(mode) != 32 && get_mode_size_bits(mode) != 64)
		panic("insupported modulo shift used");

	ir_node *in[3];
	int      arity = 0;
	if (flags & match_mode_neutral) {
		op1 = skip_downconv(op1);
		in[arity++] = be_transform_node(op1);
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		mode = get_mode_size_bits(mode) > 32 ? mode_gp : mode_Iu;
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	} else {
		op1 = skip_sameconv(op1);
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		/* Use 8/16bit operations instead of doing zext/upconv */
		in[arity++] = be_transform_node(op1);
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	}

	/* we can skip any convs for the shift count, as it only uses the lowest
	 * 5/6 bits anyway */
	while (is_Conv(op2) && get_irn_n_edges(op2) == 1) {
		ir_node *const op = get_Conv_op(op2);
		if (mode_is_float(get_irn_mode(op)))
			break;
		op2 = op;
	}

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	amd64_shift_attr_t attr;
	memset(&attr, 0, sizeof(attr));
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	const arch_register_req_t **reqs;
	const arch_register_req_t  *out_req0;
	if (is_Const(op2)) {
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		attr.base.op_mode = AMD64_OP_SHIFT_IMM;
		reqs              = reg_reqs;
		out_req0          = &amd64_requirement_gp_same_0;
		attr.immediate    = get_tarval_long(get_Const_tarval(op2));
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	} else {
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		attr.base.op_mode = AMD64_OP_SHIFT_REG;
		in[arity++]       = be_transform_node(op2);
		reqs              = reg_rcx_reqs;
		out_req0          = &amd64_requirement_gp_same_0_not_1;
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	}
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	attr.insn_mode = get_insn_mode_from_mode(mode);
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	ir_node  *const block     = get_nodes_block(node);
	dbg_info *const dbgi      = get_irn_dbg_info(node);
	ir_node  *const new_block = be_transform_node(block);
	ir_node  *const new_node  = func(dbgi, new_block, arity, in, &attr);
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	arch_set_irn_register_reqs_in(new_node, reqs);
	arch_set_irn_register_req_out(new_node, 0, out_req0);
	return new_node;
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}

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static ir_node *gen_Add(ir_node *const node)
{
	ir_node *op1 = get_Add_left(node);
	ir_node *op2 = get_Add_right(node);
	ir_node *res = gen_binop_am(node, op1, op2, new_bd_amd64_Add,
	                            match_immediate | match_am | match_mode_neutral
	                            | match_commutative);
	x86_mark_non_am(node);
	return res;
}
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static ir_node *gen_Sub(ir_node *const node)
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{
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	/* do not match AM yet until we have a sub->neg+add rule in amd64_finish */
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	dbg_info *const dbgi    = get_irn_dbg_info(node);
	ir_node  *const block   = be_transform_node(get_nodes_block(node));
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	ir_node  *const op1     = get_Sub_left(node);
	ir_node  *const op2     = get_Sub_right(node);
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	ir_node  *const new_op1 = be_transform_node(op1);
	ir_node  *const new_op2 = be_transform_node(op2);
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	ir_mode  *const mode    = get_irn_mode(node);
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	ir_node *in[2] = { new_op1, new_op2 };
	amd64_binop_addr_attr_t attr;
	memset(&attr, 0, sizeof(attr));
	attr.base.base.op_mode = AMD64_OP_REG_REG;
	attr.base.insn_mode    = get_insn_mode_from_mode(mode);
	ir_node *res = new_bd_amd64_Sub(dbgi, block, ARRAY_SIZE(in), in, &attr);
	arch_set_irn_register_reqs_in(res, reg_reg_reqs);
	arch_set_irn_register_req_out(res, 0, &amd64_requirement_gp_same_0);
	return new_r_Proj(res, mode_gp, pn_amd64_Sub_res);
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}

static ir_node *gen_And(ir_node *const node)
{
	ir_node *op1 = get_And_left(node);
	ir_node *op2 = get_And_right(node);
	return gen_binop_am(node, op1, op2, new_bd_amd64_And,
	                    match_immediate | match_am | match_mode_neutral
	                    | match_commutative);
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}

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static ir_node *gen_Eor(ir_node *const node)
{
	ir_node *op1 = get_Eor_left(node);
	ir_node *op2 = get_Eor_right(node);
	return gen_binop_am(node, op1, op2, new_bd_amd64_Xor,
	                    match_immediate | match_am | match_mode_neutral
	                    | match_commutative);
}

static ir_node *gen_Or(ir_node *const node)
{
	ir_node *op1 = get_Or_left(node);
	ir_node *op2 = get_Or_right(node);
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	return gen_binop_am(node, op1, op2, new_bd_amd64_Or,
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	                    match_immediate | match_am | match_mode_neutral
	                    | match_commutative);
}

static ir_node *gen_Mul(ir_node *const node)
{
	ir_node *op1 = get_Mul_left(node);
	ir_node *op2 = get_Mul_right(node);
	return gen_binop_am(node, op1, op2, new_bd_amd64_IMul,
	                    match_immediate | match_am | match_mode_neutral
	                    | match_commutative);
}

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static ir_node *gen_Mulh(ir_node *const node)
{
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	ir_node *op1  = get_Mulh_left(node);
	ir_node *op2  = get_Mulh_right(node);
	ir_mode *mode = get_irn_mode(op1);
	ir_node *new_node;

	if(mode_is_signed(mode)) {
		new_node = gen_binop_rax(node, op1, op2, new_bd_amd64_IMul1Op,
                        /* match_am TODO */
                        match_mode_neutral | match_commutative);
        return new_r_Proj(new_node, mode_gp, pn_amd64_IMul1Op_res_high);
	} else {
		new_node = gen_binop_rax(node, op1, op2, new_bd_amd64_Mul,
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                         /* match_am TODO */
                         match_mode_neutral | match_commutative);
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		return new_r_Proj(new_node, mode_gp, pn_amd64_Mul_res_high);
	}
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}

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static ir_node *gen_Shl(ir_node *const node)
{
	ir_node *op1 = get_Shl_left(node);
	ir_node *op2 = get_Shl_right(node);
	return gen_shift_binop(node, op1, op2, new_bd_amd64_Shl,
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	                       match_immediate | match_mode_neutral);
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}

static ir_node *gen_Shr(ir_node *const node)
{
	ir_node *op1 = get_Shr_left(node);
	ir_node *op2 = get_Shr_right(node);
	return gen_shift_binop(node, op1, op2, new_bd_amd64_Shr,
	                       match_immediate);
}

static ir_node *gen_Shrs(ir_node *const node)
{
	ir_node *op1 = get_Shrs_left(node);
	ir_node *op2 = get_Shrs_right(node);
	return gen_shift_binop(node, op1, op2, new_bd_amd64_Sar,
	                       match_immediate);
}
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static ir_node *create_div(ir_node *const node, ir_mode *const mode,
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                           ir_node *const op1, ir_node *const op2)
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{
	dbg_info *const dbgi    = get_irn_dbg_info(node);
	ir_node  *const block   = be_transform_node(get_nodes_block(node));
	amd64_insn_mode_t insn_mode
		= get_mode_size_bits(mode) > 32 ? INSN_MODE_64 : INSN_MODE_32;
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	ir_node *res;
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	ir_node *in[3];
	int      arity = 0;
	const arch_register_req_t **reqs;
	amd64_op_mode_t op_mode;

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	if (mode_is_signed(mode)) {
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		ir_node  *const new_op1 = be_transform_node(op1);

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		amd64_shift_attr_t attr;
		memset(&attr, 0, sizeof(attr));
		attr.base.op_mode = AMD64_OP_SHIFT_IMM;
		attr.insn_mode    = insn_mode;
		attr.immediate    = get_mode_size_bits(mode)-1;
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		ir_node *sar_in[1] = { new_op1 };
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		ir_node *const upper
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			= new_bd_amd64_Sar(dbgi, block, ARRAY_SIZE(sar_in), sar_in, &attr);
		arch_set_irn_register_reqs_in(upper, reg_reqs);

		in[arity++] = upper;
		gen_binop_rax_reg(op1, op2, in, &arity, &op_mode, &reqs);
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		amd64_addr_t addr;
		memset(&addr, 0, sizeof(addr));
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		res = new_bd_amd64_IDiv(dbgi, block, arity, in, insn_mode,
                                op_mode, addr);
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	} else {
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		const arch_register_req_t **zero_reqs;
		zero_reqs           = reg_reqs;
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		ir_node *const zero = new_bd_amd64_Xor0(dbgi, block);
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		in[arity++]         = zero;
		arch_set_irn_register_reqs_in(zero, zero_reqs);

		gen_binop_rax_reg(op1, op2, in, &arity, &op_mode, &reqs);

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		amd64_addr_t addr;
		memset(&addr, 0, sizeof(addr));
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		res  = new_bd_amd64_Div(dbgi, block, arity, in, insn_mode,
                                op_mode, addr);
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	}
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	arch_set_irn_register_reqs_in(res, reqs);
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	return res;
}

static ir_node *gen_Div(ir_node *const node)
{
	ir_mode *const mode = get_Div_resmode(node);
	if (!mode_needs_gp_reg(mode))
		panic("amd64: float div NIY");
	ir_node *const op1 = get_Div_left(node);
	ir_node *const op2 = get_Div_right(node);
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	return create_div(node, mode, op1, op2);
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}

static ir_node *gen_Proj_Div(ir_node *const node)
{
	ir_node *pred     = get_Proj_pred(node);
	ir_node *new_pred = be_transform_node(pred);
	long     pn       = get_Proj_proj(node);

	assert((long)pn_amd64_Div_M == (long)pn_amd64_IDiv_M);
	assert((long)pn_amd64_Div_res_div == (long)pn_amd64_IDiv_res_div);
	switch((pn_Div)pn) {
	case pn_Div_M:
		return new_r_Proj(new_pred, mode_M, pn_amd64_Div_M);
	case pn_Div_res:
		return new_r_Proj(new_pred, mode_gp, pn_amd64_Div_res_div);
	case pn_Div_X_except:
	case pn_Div_X_regular:
		panic("amd64 exception NIY");
	}
	panic("invalid Div Proj");
}

static ir_node *gen_Mod(ir_node *const node)
{
	ir_mode *const mode = get_Mod_resmode(node);
	ir_node *const op1  = get_Mod_left(node);
	ir_node *const op2  = get_Mod_right(node);
	assert(mode_needs_gp_reg(mode));
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	return create_div(node, mode, op1, op2);
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}

static ir_node *gen_Proj_Mod(ir_node *const node)
{
	ir_node *pred     = get_Proj_pred(node);
	ir_node *new_pred = be_transform_node(pred);
	long     pn       = get_Proj_proj(node);

	assert((long)pn_amd64_Div_M == (long)pn_amd64_IDiv_M);
	assert((long)pn_amd64_Div_res_mod == (long)pn_amd64_IDiv_res_mod);
	switch((pn_Mod)pn) {
	case pn_Mod_M:
		return new_r_Proj(new_pred, mode_M, pn_amd64_Div_M);
	case pn_Mod_res:
		return new_r_Proj(new_pred, mode_gp, pn_amd64_Div_res_mod);
	case pn_Mod_X_except:
	case pn_Mod_X_regular:
		panic("amd64 exception NIY");
	}
	panic("invalid Mod Proj");
}

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typedef ir_node* (*unop_constructor)(dbg_info*,ir_node*block,ir_node*op,amd64_insn_mode_t insn_mode);

static ir_node *gen_unop(ir_node *const node, int op_pos, unop_constructor gen)
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{
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	dbg_info *const dbgi   = get_irn_dbg_info(node);
	ir_node  *const block  = be_transform_node(get_nodes_block(node));
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	ir_node  *const op     = get_irn_n(node, op_pos);
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	ir_node  *const new_op = be_transform_node(op);
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	ir_mode  *const mode   = get_irn_mode(node);
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	amd64_insn_mode_t insn_mode
		= get_mode_size_bits(mode) > 32 ? INSN_MODE_64 : INSN_MODE_32;
	return gen(dbgi, block, new_op, insn_mode);
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}

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static ir_node *gen_Minus(ir_node *const node)
{
	return gen_unop(node, n_Minus_op, &new_bd_amd64_Neg);
}
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static ir_node *gen_Not(ir_node *const node)
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{
	return gen_unop(node, n_Not_op, &new_bd_amd64_Not);
}
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static ir_node *gen_Sel(ir_node *const node)
{
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	ir_node   *block     = get_nodes_block(node);
	ir_node   *new_block = be_transform_node(block);
	dbg_info  *dbgi      = get_irn_dbg_info(node);
	ir_node   *ptr       = get_Sel_ptr(node);
	ir_graph  *irg       = get_irn_irg(node);
	ir_node   *base      = get_frame_base(irg);
	ir_entity *entity    = get_Sel_entity(node);
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	if (!is_Proj(ptr) || !is_Start(get_Proj_pred(ptr)))
		panic("Sel not lowered");
	if (get_Sel_n_indexs(node) > 0)
		panic("array Sel not lowered %+F", node);
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	if (is_parameter_entity(entity) &&
	    get_entity_parameter_number(entity) == IR_VA_START_PARAMETER_NUMBER)
	    panic("va_start NIY");
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	amd64_addr_t addr;
	memset(&addr, 0, sizeof(addr));
	addr.base_input  = 0;
	addr.index_input = NO_INPUT;
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	addr.immediate.entity = entity;
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	ir_node *in[] = { base };
	ir_node *res = new_bd_amd64_Lea(dbgi, new_block, ARRAY_SIZE(in), in,
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	                                INSN_MODE_64, addr);
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	arch_set_irn_register_reqs_in(res, reg_reqs);
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	return res;
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}

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static ir_node *gen_Jmp(ir_node *node)
{
	ir_node  *block     = get_nodes_block(node);
	ir_node  *new_block = be_transform_node(block);
	dbg_info *dbgi      = get_irn_dbg_info(node);

	return new_bd_amd64_Jmp(dbgi, new_block);
}

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static ir_node *gen_Switch(ir_node *node)
{
	ir_graph *irg       = get_irn_irg(node);
	ir_node  *new_block = be_transform_node(get_nodes_block(node));
	ir_node  *sel       = get_Switch_selector(node);
	dbg_info *dbgi      = get_irn_dbg_info(node);
	ir_node  *new_sel   = be_transform_node(sel);
	const ir_switch_table *table  = get_Switch_table(node);
	unsigned               n_outs = get_Switch_n_outs(node);

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	ir_type   *const utype  = get_unknown_type();
	ir_entity *const entity = new_entity(utype, id_unique("TBL%u"), utype);
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	set_entity_visibility(entity, ir_visibility_private);
	add_entity_linkage(entity, IR_LINKAGE_CONSTANT);

	table = ir_switch_table_duplicate(irg, table);

	ir_node *out = new_bd_amd64_SwitchJmp(dbgi, new_block, new_sel, n_outs, table, entity);
	return out;
}

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static void make_start_out(reg_info_t *const info, struct obstack *const obst,
                           ir_node *const start, size_t const offset,
                           arch_register_t const *const reg,
                           arch_register_req_type_t const flags)
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{
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	info->offset = offset;
	info->irn    = NULL;
	arch_register_req_t const *const req
		= be_create_reg_req(obst, reg, arch_register_req_type_ignore | flags);
	arch_set_irn_register_req_out(start, offset, req);
	arch_set_irn_register_out(start, offset, reg);
}
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static ir_node *gen_Start(ir_node *node)
{
	ir_graph  *irg           = get_irn_irg(node);
	ir_entity *entity        = get_irg_entity(irg);
	ir_type   *function_type = get_entity_type(entity);
	ir_node   *block         = get_nodes_block(node);
	ir_node   *new_block     = be_transform_node(block);
	dbg_info  *dbgi          = get_irn_dbg_info(node);
	struct obstack *obst     = be_get_be_obst(irg);

	amd64_cconv_t const *const cconv = current_cconv;

	/* start building list of start constraints */

	/* calculate number of outputs */
	size_t n_outs = 2; /* memory, rsp */
	if (!cconv->omit_fp)
		++n_outs; /* rbp */
	/* function parameters */
	n_outs += cconv->n_param_regs;
	size_t n_callee_saves
		= rbitset_popcount(cconv->callee_saves, N_AMD64_REGISTERS);
	n_outs += n_callee_saves;

	ir_node *start = new_bd_amd64_Start(dbgi, new_block, n_outs);

	size_t o = 0;

	/* first output is memory */
	start_mem.offset = o;
	start_mem.irn    = NULL;
	arch_set_irn_register_req_out(start, o, arch_no_register_req);
	++o;

	/* the stack pointer */
	make_start_out(&start_sp, obst, start, o++, &amd64_registers[REG_RSP],
	               arch_register_req_type_produces_sp);

	if (!cconv->omit_fp) {
		make_start_out(&start_fp, obst, start, o++, &amd64_registers[REG_RBP],
		               arch_register_req_type_none);
	}

	/* function parameters in registers */
	start_params_offset = o;
	for (size_t i = 0; i < get_method_n_params(function_type); ++i) {
		const reg_or_stackslot_t *param = &current_cconv->parameters[i];
		const arch_register_t    *reg   = param->reg;
		if (reg != NULL) {
			arch_set_irn_register_req_out(start, o, reg->single_req);
			arch_set_irn_register_out(start, o, reg);
			++o;
		}
	}

	/* callee saves */
	start_callee_saves_offset = o;
	for (size_t i = 0; i < N_AMD64_REGISTERS; ++i) {
		if (!rbitset_is_set(cconv->callee_saves, i))
			continue;
		const arch_register_t *reg = &amd64_registers[i];
		arch_set_irn_register_req_out(start, o, reg->single_req);
		arch_set_irn_register_out(start, o, reg);
		++o;
	}
	assert(n_outs == o);

	return start;
}

static ir_node *gen_Proj_Start(ir_node *node)
{
	ir_graph *irg       = get_irn_irg(node);
	ir_node  *block     = get_nodes_block(node);
	ir_node  *new_block = be_transform_node(block);
	long      pn        = get_Proj_proj(node);
	be_transform_node(get_Proj_pred(node));

	switch ((pn_Start)pn) {
	case pn_Start_X_initial_exec:
		return new_bd_amd64_Jmp(NULL, new_block);
	case pn_Start_M:
		return get_initial_mem(irg);
	case pn_Start_T_args:
		return new_r_Bad(irg, mode_T);
	case pn_Start_P_frame_base:
		return get_frame_base(irg);
	}
	panic("Unexpected Start Proj: %ld\n", pn);
}

static ir_node *get_stack_pointer_for(ir_node *node)
{
	/* get predecessor in stack_order list */
	ir_node *stack_pred = be_get_stack_pred(stackorder, node);
	if (stack_pred == NULL) {
		/* first stack user in the current block. We can simply use the
		 * initial sp_proj for it */
		ir_graph *irg = get_irn_irg(node);
		return get_initial_sp(irg);
	}

	be_transform_node(stack_pred);
	ir_node *stack = pmap_get(ir_node, node_to_stack, stack_pred);
	if (stack == NULL) {
		return get_stack_pointer_for(stack_pred);
	}

	return stack;
}

static ir_node *gen_Return(ir_node *node)
{
	ir_node  *block     = get_nodes_block(node);
	ir_graph *irg       = get_irn_irg(node);
	ir_node  *new_block = be_transform_node(block);
	dbg_info *dbgi      = get_irn_dbg_info(node);
	ir_node  *mem       = get_Return_mem(node);
	ir_node  *new_mem   = be_transform_node(mem);
	ir_node  *sp        = get_stack_pointer_for(node);
	size_t    n_res     = get_Return_n_ress(node);
	struct obstack *be_obst = be_get_be_obst(irg);
	amd64_cconv_t  *cconv   = current_cconv;

	/* estimate number of return values */
	size_t n_ins = 2 + n_res; /* memory + stackpointer, return values */
	size_t n_callee_saves
		= rbitset_popcount(cconv->callee_saves, N_AMD64_REGISTERS);
	n_ins += n_callee_saves;

	const arch_register_req_t **reqs
		= OALLOCN(be_obst, const arch_register_req_t*, n_ins);
	ir_node **in = ALLOCAN(ir_node*, n_ins);
	size_t    p  = 0;

	in[p]   = new_mem;
	reqs[p] = arch_no_register_req;
	++p;

	in[p]   = sp;
	reqs[p] = amd64_registers[REG_RSP].single_req;
	++p;

	/* result values */
	for (size_t i = 0; i < n_res; ++i) {
		ir_node                  *res_value     = get_Return_res(node, i);
		ir_node                  *new_res_value = be_transform_node(res_value);
		const reg_or_stackslot_t *slot          = &current_cconv->results[i];
		in[p]   = new_res_value;
		reqs[p] = slot->req;
		++p;
	}
	/* callee saves */
	ir_node *start = get_irg_start(irg);
	long start_pn = start_callee_saves_offset;
	for (size_t i = 0; i < N_AMD64_REGISTERS; ++i) {
		if (!rbitset_is_set(cconv->callee_saves, i))
			continue;
		const arch_register_t *reg    = &amd64_registers[i];
		ir_mode               *mode  = reg->reg_class->mode;
		ir_node               *value = new_r_Proj(start, mode, start_pn++);
		in[p]   = value;
		reqs[p] = reg->single_req;
		++p;
	}
	assert(p == n_ins);

	ir_node *returnn = new_bd_amd64_Return(dbgi, new_block, n_ins, in);
	arch_set_irn_register_reqs_in(returnn, reqs);

	return returnn;
}

static ir_node *gen_Call(ir_node *node)
{
	ir_node         *callee       = get_Call_ptr(node);
	ir_node         *block        = get_nodes_block(node);
	ir_node         *new_block    = be_transform_node(block);
	dbg_info        *dbgi         = get_irn_dbg_info(node);
	ir_node         *mem          = get_Call_mem(node);
	ir_node         *new_mem      = be_transform_node(mem);
	ir_type         *type         = get_Call_type(node);
	size_t           n_params     = get_Call_n_params(node);
	size_t           n_ress       = get_method_n_ress(type);
	/* max inputs: memory, callee, register arguments */
	ir_node        **sync_ins     = ALLOCAN(ir_node*, n_params);
	ir_graph        *irg          = get_irn_irg(node);
	struct obstack  *obst         = be_get_be_obst(irg);
	amd64_cconv_t   *cconv
		= amd64_decide_calling_convention(type, NULL);
	size_t           n_param_regs = cconv->n_param_regs;
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	/* param-regs + mem + stackpointer + callee(2) + n_sse_regs */
	unsigned         max_inputs   = 5 + n_param_regs;
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	ir_node        **in           = ALLOCAN(ir_node*, max_inputs);
	const arch_register_req_t **in_req
		= OALLOCNZ(obst, const arch_register_req_t*, max_inputs);
	int              in_arity     = 0;
	int              sync_arity   = 0;
	ir_node         *new_frame    = get_stack_pointer_for(node);

	assert(n_params == get_method_n_params(type));

	/* construct arguments */

	/* memory input */
	in_req[in_arity] = arch_no_register_req;
	int mem_pos      = in_arity;
	++in_arity;

	/* stack pointer input */
	/* construct an IncSP -> we have to always be sure that the stack is
	 * aligned even if we don't push arguments on it */
	const arch_register_t *sp_reg = &amd64_registers[REG_RSP];
	ir_node *incsp = be_new_IncSP(sp_reg, new_block, new_frame,
	                              cconv->param_stack_size, 1);
	in_req[in_arity] = sp_reg->single_req;
	in[in_arity]     = incsp;
	++in_arity;

	/* vararg calls need the number of SSE registers used */
	if (get_method_variadicity(type) == variadicity_variadic) {
		ir_node *zero = new_bd_amd64_Xor0(NULL, block);
		in_req[in_arity] = amd64_registers[REG_RAX].single_req;
		in[in_arity] = zero;
		++in_arity;
	}

	/* parameters */
	for (size_t p = 0; p < n_params; ++p) {
		ir_node                  *value      = get_Call_param(node, p);
		const reg_or_stackslot_t *param      = &cconv->parameters[p];
		ir_type                  *param_type = get_method_param_type(type, p);
		ir_mode                  *mode       = get_type_mode(param_type);
		assert(mode_needs_gp_reg(mode));

		ir_node *new_value = be_transform_node(value);

		/* put value into registers */
		if (param->reg != NULL) {
			in[in_arity]     = new_value;
			in_req[in_arity] = param->reg->single_req;
			++in_arity;
			continue;
		}
		/* we need a store if we're here */
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		amd64_binop_addr_attr_t attr;
		memset(&attr, 0, sizeof(attr));
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		attr.base.addr.immediate.offset = param->offset;
		attr.base.addr.base_input       = 1;
		attr.base.addr.index_input      = NO_INPUT;
		attr.base.insn_mode             = INSN_MODE_64;
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		ir_node *in[] = { new_value, incsp, new_mem };
		ir_node *store = new_bd_amd64_Store(dbgi, new_block, ARRAY_SIZE(in), in,
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		                                    &attr);
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		arch_set_irn_register_reqs_in(store, reg_reg_mem_reqs);
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		set_irn_pinned(store, op_pin_state_floats);
		sync_ins[sync_arity++] = store;
	}

	/* construct memory input */
	if (sync_arity == 0) {
		in[mem_pos] = new_mem;
	} else if (sync_arity == 1) {
		in[mem_pos] = sync_ins[0];
	} else {
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		in[mem_pos] = new_r_Sync(new_block, sync_arity, sync_ins);
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	}

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	/* match callee */
	amd64_addr_t addr;
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	memset(&addr, 0, sizeof(addr));
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	addr.mem_input = NO_INPUT;
	amd64_op_mode_t op_mode;
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	if (match_immediate_32(&addr.immediate, callee, true, true)) {
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		op_mode = AMD64_OP_CALL_IMM32;
	} else if (source_am_possible(block, callee, NULL)) {
		/* TODO: check condition, can't other call inputs be dependent
		 * on the load which would make this invalid? */
		x86_address_t maddr;
		memset(&maddr, 0, sizeof(maddr));
		x86_create_address_mode(&maddr, callee, x86_create_am_normal);

		addr.immediate.entity = maddr.entity;
		addr.immediate.offset = maddr.offset;
		if (maddr.base != NULL) {
			int base_input     = in_arity++;
			in[base_input]     = be_transform_node(maddr.base);
			in_req[base_input] = &amd64_requirement_gp;
			addr.base_input    = base_input;
		} else {
			addr.base_input = NO_INPUT;
		}
		if (maddr.index != NULL) {
			int index_input     = in_arity++;
			in[index_input]     = be_transform_node(maddr.index);
			in_req[index_input] = &amd64_requirement_gp;
			addr.index_input    = index_input;
			addr.log_scale      = maddr.scale;
		} else {
			addr.index_input = NO_INPUT;
		}
		op_mode = AMD64_OP_CALL_ADDR;
	} else {
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		int base_input     = in_arity++;
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		in[base_input]     = be_transform_node(callee);
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		in_req[base_input] = &amd64_requirement_gp;
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		addr.base_input    = base_input;
		addr.index_input   = NO_INPUT;
		op_mode = AMD64_OP_CALL_ADDR;
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	}

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	assert(in_arity <= (int)max_inputs);

	/* outputs:
	 *  - memory
	 *  - results
	 *  - caller saves
	 */
	int n_caller_saves
		= rbitset_popcount(cconv->caller_saves, N_AMD64_REGISTERS);
	int out_arity = 1 + cconv->n_reg_results + n_caller_saves;

	/* create call node */
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	ir_node *call = new_bd_amd64_Call(dbgi, new_block, in_arity, in, out_arity,
	                                  op_mode, addr);
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	arch_set_irn_register_reqs_in(call, in_req);

	/* create output register reqs */
	int o = 0;
	arch_set_irn_register_req_out(call, o++, arch_no_register_req);
	/* add register requirements for the result regs */
	for (size_t r = 0; r < n_ress; ++r) {
		const reg_or_stackslot_t  *result_info = &cconv->results[r];
		const arch_register_req_t *req         = result_info->req;
		if (req != NULL) {
			arch_set_irn_register_req_out(call, o++, req);
		}
	}
	const unsigned *allocatable_regs = be_birg_from_irg(irg)->allocatable_regs;
	for (size_t i = 0; i < N_AMD64_REGISTERS; ++i) {
		if (!rbitset_is_set(cconv->caller_saves, i))
			continue;
		const arch_register_t *reg = &amd64_registers[i];
		arch_set_irn_register_req_out(call, o, reg->single_req);
		if (!rbitset_is_set(allocatable_regs, reg->global_index))
			arch_set_irn_register_out(call, o, reg);
		++o;
	}
	assert(o == out_arity);

	/* copy pinned attribute */
	set_irn_pinned(call, get_irn_pinned(node));

	/* IncSP to destroy the call stackframe */
	incsp = be_new_IncSP(sp_reg, new_block, incsp, -cconv->param_stack_size, 0);
	/* if we are the last IncSP producer in a block then we have to keep
	 * the stack value.
	 * Note: This here keeps all producers which is more than necessary */
	add_irn_dep(incsp, call);
	keep_alive(incsp);

	pmap_insert(node_to_stack, node, incsp);

	amd64_free_calling_convention(cconv);
	return call;
}

static ir_node *gen_Proj_Call(ir_node *node)
{
	long     pn       = get_Proj_proj(node);
	ir_node *call     = get_Proj_pred(node);
	ir_node *new_call = be_transform_node(call);
	switch ((pn_Call)pn) {
	case pn_Call_M:
		return new_r_Proj(new_call, mode_M, 0);
	case pn_Call_X_regular:
	case pn_Call_X_except:
	case pn_Call_T_result:
		break;
	}
	panic("Unexpected Call proj %+F\n", node);
}

static ir_node *gen_Proj_Proj_Call(ir_node *node)
{
	long           pn       = get_Proj_proj(node);
	ir_node       *call     = get_Proj_pred(get_Proj_pred(node));
	ir_node       *new_call = be_transform_node(call);
	ir_type       *tp       = get_Call_type(call);
	amd64_cconv_t *cconv    = amd64_decide_calling_convention(tp, NULL);
	const reg_or_stackslot_t *res  = &cconv->results[pn];
	ir_mode                  *mode = get_irn_mode(node);
	long                      new_pn = 1 + res->reg_offset;

	assert(res->req != NULL);
	if (mode_needs_gp_reg(mode))
		mode = mode_gp;
	amd64_free_calling_convention(cconv);
	return new_r_Proj(new_call, mode, new_pn);
}

static ir_node *gen_Proj_Proj_Start(ir_node *node)
{
	ir_node *block     = get_nodes_block(node);
	ir_node *new_block = be_transform_node(block);
	long     pn        = get_Proj_proj(node);
	ir_node *args      = get_Proj_pred(node);
	ir_node *start     = get_Proj_pred(args);
	ir_node *new_start = be_transform_node(start);

	assert(get_Proj_proj(args) == pn_Start_T_args);

	const reg_or_stackslot_t *param = &current_cconv->parameters[pn];
	if (param->reg != NULL) {
		/* argument transmitted in register */
		const arch_register_t *reg    = param->reg;
		ir_mode               *mode   = reg->reg_class->mode;
		long                   new_pn = param->reg_offset + start_params_offset;
		ir_node               *value  = new_r_Proj(new_start, mode, new_pn);
		return value;
	} else {
		/* argument transmitted on stack */
		ir_graph *irg  = get_irn_irg(node);
		ir_mode  *mode = get_type_mode(param->type);
		ir_node  *base = get_frame_base(irg);

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		amd64_insn_mode_t insn_mode = get_insn_mode_from_mode(mode);
		amd64_addr_t      addr;
		memset(&addr, 0, sizeof(addr));
		addr.base_input       = 0;
		addr.index_input      = NO_INPUT;
		addr.mem_input        = NO_INPUT;
		addr.immediate.entity = param->entity;
		ir_node *in[]  = { base };
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		ir_node *load;
		ir_node *value;
		if (get_mode_size_bits(mode) < 64 && mode_is_signed(mode)) {
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			load  = new_bd_amd64_Movs(NULL, new_block, ARRAY_SIZE(in),
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			                          in, insn_mode, AMD64_OP_ADDR, addr);
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			value = new_r_Proj(load, mode_gp, pn_amd64_Movs_res);
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		} else {
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			load  = new_bd_amd64_Mov(NULL, new_block, ARRAY_SIZE(in),
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			                         in, insn_mode, AMD64_OP_ADDR, addr);
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			value = new_r_Proj(load, mode_gp, pn_amd64_Mov_res);
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		}
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		arch_set_irn_register_reqs_in(load, reg_mem_reqs);
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		set_irn_pinned(load, op_pin_state_floats);
		return value;
	}
}

static ir_node *gen_Proj_Proj(ir_node *node)
{
	ir_node *pred      = get_Proj_pred(node);
	ir_node *pred_pred = get_Proj_pred(pred);
	if (is_Call(pred_pred)) {
		return gen_Proj_Proj_Call(node);
	} else if (is_Start(pred_pred)) {
		return gen_Proj_Proj_Start(node);
	}
	panic("amd64: unexpected Proj(Proj) after %+F", pred_pred);
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}

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static ir_node *gen_Cmp(ir_node *node)
{
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	ir_node *op1      = get_Cmp_left(node);
	ir_node *op2      = get_Cmp_right(node);
	ir_mode *cmp_mode = get_irn_mode(op1);
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	if (mode_is_float(cmp_mode))
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		panic("Floating point not implemented yet!");
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	ir_node *block = get_nodes_block(node);
	amd64_args_t args;
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	match_binop(&args, block, cmp_mode, op1, op2, match_immediate | match_am);
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	dbg_info *const dbgi      = get_irn_dbg_info(node);
	ir_node  *const new_block = be_transform_node(block);

	ir_node *new_node
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		= new_bd_amd64_Cmp(dbgi, new_block, args.arity, args.in, &args.attr);
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	arch_set_irn_register_reqs_in(new_node, args.reqs);

	if (args.mem_proj != NULL) {
		ir_node *load = get_Proj_pred(args.mem_proj);
		be_set_transformed_node(load, new_node);
	}
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	return new_r_Proj(new_node, mode_flags, pn_amd64_Cmp_flags);
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}

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static ir_node *get_flags_node(ir_node *cmp, x86_condition_code_t *cc_out)
{
	/* must have a Cmp as input */
	ir_relation relation = get_Cmp_relation(cmp);
	ir_node    *l        = get_Cmp_left(cmp);
	ir_node    *r        = get_Cmp_right(cmp);
	ir_mode    *mode     = get_irn_mode(l);

	/* the middle-end tries to eliminate impossible relations, so a ptr <> 0
	 * test becomes ptr > 0. But for x86 an equal comparison is preferable to
	 * a >0 (we can sometimes eliminate the cmp in favor of flags produced by
	 * a predecessor node). So add the < bit.
	 * (Note that we do not want to produce <=> (which can happen for
	 * unoptimized code), because no x86 flag can represent that */
	if (!(relation & ir_relation_equal) && relation & ir_relation_less_greater)
		relation |= get_negated_relation(ir_get_possible_cmp_relations(l, r)) & ir_relation_less_greater;

	bool overflow_possible = true;
	if (is_Const(r) && is_Const_null(r))
		overflow_possible = false;

	/* just do a normal transformation of the Cmp */
	*cc_out = ir_relation_to_x86_condition_code(relation, mode,
	                                            overflow_possible);
	ir_node *flags = be_transform_node(cmp);
	return flags;
}

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static ir_node *gen_Cond(ir_node *node)
{
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	ir_node             *sel = get_Cond_selector(node);
	x86_condition_code_t cc;
	ir_node             *flags = get_flags_node(sel, &cc);

	dbg_info *const dbgi  = get_irn_dbg_info(node);
	ir_node  *const block = be_transform_node(get_nodes_block(node));
	return new_bd_amd64_Jcc(dbgi, block, flags, cc);
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}
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static ir_node *gen_Phi(ir_node *node)
{
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	ir_mode                   *mode = get_irn_mode(node);
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	const arch_register_req_t *req;
	if (mode_needs_gp_reg(mode)) {
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		/* all integer operations are on 64bit registers now */
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		req  = amd64_reg_classes[CLASS_amd64_gp].class_req;
	} else {
		req = arch_no_register_req;
	}

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	return be_transform_phi(node, req);
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}

static ir_node *gen_Conv(ir_node *node)
{
	ir_node  *block    = be_transform_node(get_nodes_block(node));
	ir_node  *op       = get_Conv_op(node);
	ir_mode  *src_mode = get_irn_mode(op);
	ir_mode  *dst_mode = get_irn_mode(node);
	dbg_info *dbgi     = get_irn_dbg_info(node);

	if (src_mode == dst_mode)
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		return be_transform_node(op);
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	/* TODO: implement float */
	if (mode_is_float(src_mode) || mode_is_float(dst_mode))
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		panic("float not supported yet");

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	/* complete in gp registers */
	int src_bits = get_mode_size_bits(src_mode);
	int dst_bits = get_mode_size_bits(dst_mode);
	ir_mode *min_mode;

	if (src_bits < dst_bits) {
		min_mode = src_mode;
	} else if (src_bits > dst_bits) {
		min_mode = dst_mode;
	} else {
		/* skip unnecessary conv */
		return be_transform_node(op);
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	}
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	if (be_upper_bits_clean(op, min_mode))
		return be_transform_node(op);

	amd64_addr_t addr;
	memset(&addr, 0, sizeof(addr));
	amd64_insn_mode_t insn_mode = get_insn_mode_from_mode(min_mode);

	ir_node *new_op = be_transform_node(op);
	ir_node *in[1]  = { new_op };
	ir_node *mov;
	ir_node *res;
	if (!mode_is_signed(min_mode) || get_mode_size_bits(min_mode) == 64) {
		mov = new_bd_amd64_Mov(dbgi, block, ARRAY_SIZE(in), in, insn_mode,
							   AMD64_OP_REG, addr);
		res = new_r_Proj(mov, mode_gp, pn_amd64_Mov_res);
	} else {
		mov = new_bd_amd64_Movs(dbgi, block, ARRAY_SIZE(in), in, insn_mode,
								AMD64_OP_REG, addr);
		res = new_r_Proj(mov, mode_gp, pn_amd64_Movs_res);
	}
	arch_set_irn_register_reqs_in(mov, reg_reqs);
	return res;