amd64_transform.c 68.1 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,
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	0
};

static const arch_register_req_t amd64_requirement_flags = {
	arch_register_req_type_normal,
	&amd64_reg_classes[CLASS_amd64_flags],
	NULL,
	0,
	0,
	1
};

static const arch_register_req_t amd64_requirement_xmm = {
	arch_register_req_type_normal,
	&amd64_reg_classes[CLASS_amd64_xmm],
	NULL,
	0,
	0,
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	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
};

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static const arch_register_req_t amd64_requirement_xmm_same_0 = {
	arch_register_req_type_normal | arch_register_req_type_should_be_same,
	&amd64_reg_classes[CLASS_amd64_xmm],
	NULL,
	BIT(0),
	0,
	1
};

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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 unsigned amd64_limited_gp_rdx [] = { BIT(REG_GP_RDX) };
static const arch_register_req_t amd64_requirement_rdx = {
	arch_register_req_type_limited,
	&amd64_reg_classes[CLASS_amd64_gp],
	amd64_limited_gp_rdx,
	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_flags_reqs[] = {
	&amd64_requirement_gp,
	&amd64_requirement_gp,
	&amd64_requirement_flags,
};

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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 *rax_reg_rdx_reqs[] = {
	&amd64_requirement_rax,
	&amd64_requirement_gp,
	&amd64_requirement_rdx,
};

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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,
};

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static const arch_register_req_t *no_reqs[] = {
};

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static const arch_register_req_t *xmm_xmm_reqs[] = {
	&amd64_requirement_xmm,
	&amd64_requirement_xmm,
};

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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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	ir_tarval *tv = get_Const_tarval(node);
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	if (!mode_needs_gp_reg(mode)) {
		if (tarval_is_null(tv)) {
			return new_bd_amd64_Xorp0(dbgi, block);
		}

		panic("amd64: float constant not supported yet");
	}

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	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));
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	addr.base_input  = NO_INPUT;
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	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);
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		ir_node *load = new_bd_amd64_Mov(dbgi, block, 0, NULL, INSN_MODE_64,
										 AMD64_OP_ADDR, addr);
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		return new_r_Proj(load, mode_gp, pn_amd64_Mov_res);
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	}
}

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static ir_node *create_IncSP(const arch_register_t *sp_reg, ir_node *block,
                             ir_node *old_sp, int offset, int align)
{
	ir_node *res = be_new_IncSP(sp_reg, block, old_sp, offset, align);
	arch_add_irn_flags(res, arch_irn_flag_modify_flags);
	return 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;

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static bool input_depends_on_load(ir_node *load, ir_node *input)
{
	ir_node *block = get_nodes_block(load);
	/* if the dependency is in another block, then we ignore it for now
	   as we only match address mode loads in the same block. */
	return get_nodes_block(input) == block
	    && heights_reachable_in_block(heights, input, load);
}

static ir_node *source_am_possible(ir_node *block, ir_node *node)
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{
	if (!is_Proj(node))
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		return NULL;
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	ir_node *load = get_Proj_pred(node);
	if (!is_Load(load))
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		return NULL;
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	assert(get_Proj_proj(node) == pn_Load_res);
	if (get_nodes_block(load) != block)
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		return NULL;
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	/* make sure we are the only user */
	if (get_irn_n_edges(node) != 1)
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		return NULL;
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	/* ia32 backend claims this can happen, use an assert for now and see
	 * if we hit it :) */
	assert(!be_is_transformed(node));
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	return load;
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}

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 ir_node *create_sext(ir_node *block, ir_node *const node, ir_mode *mode)
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{
	amd64_insn_mode_t insn_mode = get_insn_mode_from_mode(mode);
	dbg_info *const   dbgi      = get_irn_dbg_info(node);
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	ir_node  *const   new_node  = be_transform_node(node);
	ir_node  *const   new_block = be_transform_node(block);
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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 *in[1]    = { new_node };
	ir_node *sext     = new_bd_amd64_Sar(dbgi, new_block, ARRAY_SIZE(in),
	                                     in, &attr);
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	arch_set_irn_register_reqs_in(sext, reg_reqs);
	arch_set_irn_register_req_out(sext, 0, &amd64_requirement_gp_same_0);

	return sext;
}

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static ir_node *create_zext(ir_node *block, ir_node *const node)
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{
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	dbg_info *const dbgi      = get_irn_dbg_info(node);
	ir_node  *const new_block = be_transform_node(block);
	ir_node  *const zero      = new_bd_amd64_Xor0(dbgi, new_block);
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	arch_set_irn_register_reqs_in(zero, reg_reqs);
	return zero;
}

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static bool use_address_matching(ir_mode *mode, match_flags_t flags,
                                 ir_node *block,
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                                 ir_node *op1, ir_node *op2,
                                 ir_node **out_load, ir_node **out_op)
{
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	if (! (flags & match_am))
		return false;
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	unsigned mode_bits = get_mode_size_bits(mode);
	if (mode_bits == 8 || mode_bits == 16)
		return false;

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	ir_node *load2 = source_am_possible(block, op2);
	if (load2 != NULL && !input_depends_on_load(load2, op1)) {
		(*out_load) = load2;
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		(*out_op)   = op1;
		return true;
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	}

	if (flags & match_commutative) {
		ir_node *load1 = source_am_possible(block, op1);
		if (load1 != NULL && !input_depends_on_load(load1, op2)) {
			(*out_load) = load1;
			(*out_op)   = op2;
			return true;
		}
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	}
	return false;
}

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static void perform_address_matching(ir_node *ptr, int *arity,
                                     ir_node **in, amd64_addr_t *addr)
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{
	x86_address_t maddr;
	memset(&maddr, 0, sizeof(maddr));

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	x86_create_address_mode(&maddr, ptr, x86_create_am_normal);
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	assert(maddr.frame_entity == NULL);

	if (maddr.base != NULL) {
		int base_input   = (*arity)++;
		addr->base_input = base_input;
		in[base_input]   = be_transform_node(maddr.base);
	} 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);
	} else {
		addr->index_input = NO_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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	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(mode, 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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		ir_node *ptr = get_Load_ptr(load);
		perform_address_matching(ptr, &(args->arity), args->in, addr);

		args->reqs = reg_mem_reqs;
		if (addr->base_input != NO_INPUT && addr->index_input != NO_INPUT) {
			args->reqs = reg_reg_reg_mem_reqs;
		} else if(addr->base_input != NO_INPUT || addr->index_input != NO_INPUT) {
			args->reqs = reg_reg_mem_reqs;
		}
		ir_node *new_mem    = be_transform_node(get_Load_mem(load));
		int mem_input       = args->arity++;
		args->in[mem_input] = new_mem;
		addr->mem_input     = mem_input;
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		args->mem_proj      = be_get_Proj_for_pn(load, pn_Load_M);
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		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);
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		args->attr.base.base.op_mode = AMD64_OP_REG_REG;
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		if (mode_is_float(mode)) {
			args->reqs = xmm_xmm_reqs;
		} else {
			args->reqs = reg_reg_reqs;
		}
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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);
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	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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	if (mode_is_float(mode)) {
		arch_set_irn_register_req_out(new_node, 0,
		                              &amd64_requirement_xmm_same_0);
		return new_node;
	} else {
		arch_set_irn_register_req_out(new_node, 0,
		                              &amd64_requirement_gp_same_0);
		return new_r_Proj(new_node, mode_gp, pn_amd64_Sub_res);
	}
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}

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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);
	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 *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));

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

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		ir_node *ptr = get_Load_ptr(load);
		perform_address_matching(ptr, &arity, in, &addr);

		reqs = reg_mem_reqs;
		if (addr.base_input != NO_INPUT && addr.index_input != NO_INPUT) {
			reqs = reg_reg_reg_mem_reqs;
		} else if(addr.base_input != NO_INPUT || addr.index_input != NO_INPUT) {
			reqs = reg_reg_mem_reqs;
		}

		ir_node *new_mem = be_transform_node(get_Load_mem(load));
		int mem_input    = arity++;
		in[mem_input]    = new_mem;
		addr.mem_input   = mem_input;
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		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);
	}

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	assert((size_t)arity <= ARRAY_SIZE(in));
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	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);
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	if (mem_proj != NULL) {
		be_set_transformed_node(load, new_node);
	}
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	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 *create_Lea_as_Add(ir_node *node, ir_node *op1, ir_node *op2)
{
	dbg_info *const dbgi = get_irn_dbg_info(node);
	ir_node  *block      = get_nodes_block(node);
	ir_node  *new_block  = be_transform_node(block);
	ir_mode *mode        = get_irn_mode(node);

	amd64_insn_mode_t insn_mode;
	if (get_mode_size_bits(mode) <= 32)
		insn_mode = INSN_MODE_32;
	else
		insn_mode = INSN_MODE_64;

	const arch_register_req_t **reqs;
	amd64_addr_t addr;
	memset(&addr, 0, sizeof(addr));

	ir_node *in[2];
	int arity = 0;

	if (match_immediate_32(&addr.immediate, op2, false, true)) {
		in[arity++]      = be_transform_node(op1);
		reqs             = reg_reqs;
		addr.index_input = NO_INPUT;
	} else {
		in[arity++]      = be_transform_node(op1);
		in[arity++]      = be_transform_node(op2);
		addr.index_input = 0;
		addr.base_input  = 1;
		reqs             = reg_reg_reqs;
	}

	ir_node *res = new_bd_amd64_Lea(dbgi, new_block, arity, in, insn_mode, addr);
	arch_set_irn_register_reqs_in(res, reqs);
	return res;
}

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static ir_node *gen_Add(ir_node *const node)
{
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	match_flags_t flags = match_immediate | match_am | match_mode_neutral
	                      | match_commutative;

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	ir_node *op1 = get_Add_left(node);
	ir_node *op2 = get_Add_right(node);
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	ir_mode *mode  = get_irn_mode(node);
	ir_node *block = get_nodes_block(node);
	ir_node *load, *op;

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	if (mode_is_float(mode)) {
		return gen_binop_am(node, op1, op2, new_bd_amd64_Adds,
		                    match_commutative | match_am);
	}

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	bool use_am = use_address_matching(mode, flags, block, op1, op2, &load, &op);

	ir_node *res;
	if (use_am)
		res = gen_binop_am(node, op1, op2, new_bd_amd64_Add, flags);
	else
		res = create_Lea_as_Add(node, op1, op2);

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	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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	ir_node  *const op1     = get_Sub_left(node);
	ir_node  *const op2     = get_Sub_right(node);
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	ir_mode  *const mode    = get_irn_mode(node);
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	if (mode_is_float(mode)) {
		return gen_binop_am(node, op1, op2, new_bd_amd64_Subs, match_am);
	} else {
		/* do not match AM yet until we have a sub->neg+add rule
		 * in amd64_finish */
		return gen_binop_am(node, op1, op2, new_bd_amd64_Sub,
		                    /* match_am | */ match_immediate);
	}
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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)
{
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	ir_node *op1  = get_Mul_left(node);
	ir_node *op2  = get_Mul_right(node);
	ir_mode *mode = get_irn_mode(node);

	if (get_mode_size_bits(mode) < 16) {
		/* imulb only supports rax - reg form */
		ir_node *new_node =
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		            gen_binop_rax(node, op1, op2, new_bd_amd64_IMul1Op,
		                          match_mode_neutral
		                          | match_commutative);
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		return new_r_Proj(new_node, mode_gp, pn_amd64_IMul1Op_res_low);
	} else {
		return gen_binop_am(node, op1, op2, new_bd_amd64_IMul,
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		                    match_immediate | match_am
		                    | match_mode_neutral | match_commutative);
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	}
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}

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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);
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		return new_r_Proj(new_node, mode_gp, pn_amd64_IMul1Op_res_high);
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	} 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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{
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	dbg_info *const dbgi      = get_irn_dbg_info(node);
	ir_node  *const block     = get_nodes_block(node);
	ir_node  *const new_block = be_transform_node(block);
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	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;
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	amd64_op_mode_t op_mode;
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	amd64_addr_t    addr;
	memset(&addr, 0, sizeof(addr));

	gen_binop_rax_reg(op1, op2, in, &arity, &op_mode, &reqs);
	reqs = rax_reg_rdx_reqs;
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	if (mode_is_signed(mode)) {
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		/* Sign extend RAX to RDX */
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		in[arity++] = create_sext(block, op1, mode);
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		res = new_bd_amd64_IDiv(dbgi, new_block, arity, in, insn_mode,
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                                op_mode, addr);
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	} else {
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		/* Zero extend to register RDX */
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		in[arity++] = create_zext(block, node);
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		res = new_bd_amd64_Div(dbgi, new_block, arity, in, insn_mode,
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                               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_Member(ir_node *const node)
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{
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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);
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	ir_node   *ptr       = get_Member_ptr(node);
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	ir_graph  *irg       = get_irn_irg(node);
	ir_node   *base      = get_frame_base(irg);
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	ir_entity *entity    = get_Member_entity(node);
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	if (!is_Proj(ptr) || !is_Start(get_Proj_pred(ptr)))
		panic("Sel not lowered");
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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_IJmp(ir_node *node)
{
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	dbg_info *dbgi      = get_irn_dbg_info(node);
	ir_node  *block     = get_nodes_block(node);
	ir_node  *new_block = be_transform_node(block);
	ir_node  *op        = get_IJmp_target(node);
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	assert(get_irn_mode(op) == mode_P);
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	int arity = 0;
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	ir_node *in[3];
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	amd64_addr_t addr;
	memset(&addr, 0, sizeof(addr));

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	const arch_register_req_t **reqs;
	amd64_op_mode_t             op_mode;
	ir_node                    *mem_proj = NULL;
	if (match_immediate_32(&addr.immediate, op, true, false)) {
		// TODO: do we need a must_match_ip_relative in match_immediate_32
		op_mode = AMD64_OP_UNOP_IMM32;
		arity   = 0;
		reqs    = no_reqs;
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	} else {
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		ir_node *load = source_am_possible(block, op);
		if (load != NULL) {
			ir_node *load_ptr = get_Load_ptr(load);
			mem_proj          = be_get_Proj_for_pn(load, pn_Load_M);

			perform_address_matching(load_ptr, &arity, in, &addr);
			assert((size_t)arity < ARRAY_SIZE(in));

			reqs = mem_reqs;
			if (addr.base_input != NO_INPUT && addr.index_input != NO_INPUT) {
				reqs = reg_reg_mem_reqs;
			} else if(addr.base_input != NO_INPUT || addr.index_input != NO_INPUT) {
				reqs = reg_mem_reqs;
			}
			ir_node *load_mem = get_Load_mem(load);
			ir_node *new_mem  = be_transform_node(load_mem);
			int mem_input     = arity++;
			in[mem_input]     = new_mem;
			addr.mem_input    = mem_input;

			op_mode = AMD64_OP_UNOP_ADDR;
		} else {
			op_mode          = AMD64_OP_UNOP_REG;
			assert(arity == 0); // UNOP_REG always outputs the first input
			in[arity++]      = be_transform_node(op);
			addr.base_input  = NO_INPUT;
			addr.index_input = NO_INPUT;
			reqs             = reg_reqs;
		}
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	}

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	ir_node *jmp = new_bd_amd64_IJmp(dbgi, new_block, arity, in,
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	                                 INSN_MODE_64, op_mode, addr);
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	arch_set_irn_register_reqs_in(jmp, reqs);
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	if (mem_proj != NULL) {
		ir_node *load = get_Proj_pred(mem_proj);
		be_set_transformed_node(load, jmp);
	}

	ir_node *proj_X = new_r_Proj(jmp, mode_X, pn_amd64_IJmp_X);
	return proj_X;
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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(irp->dummy_owner, 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 */
	/* 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);

	/* 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;
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		if (!cconv->omit_fp && i == REG_RBP) {
			make_start_out(&start_fp, obst, start, o++, &amd64_registers[REG_RBP],
						   arch_register_req_type_none);
		} else {
			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;
		}
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	}
	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;
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		const arch_register_t *reg   = &amd64_registers[i];
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		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 */
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	ir_node        **sync_ins     = ALLOCAN(ir_node*, n_params+1);
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