sparc_transform.c

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

/**
 * @file
 * @brief   code selection (transform FIRM into SPARC FIRM)
 * @author  Hannes Rapp, Matthias Braun
 */
#include <stdint.h>
#include <stdbool.h>

#include "irnode_t.h"
#include "irgraph_t.h"
#include "irmode_t.h"
#include "irgmod.h"
#include "iredges.h"
#include "ircons.h"
#include "iroptimize.h"
#include "dbginfo.h"
#include "iropt_t.h"
#include "debug.h"
#include "panic.h"
#include "util.h"

#include "beasm.h"
#include "benode.h"
#include "beirg.h"
#include "beutil.h"
#include "betranshlp.h"
#include "bearch_sparc_t.h"

#include "sparc_nodes_attr.h"
#include "sparc_transform.h"
#include "sparc_new_nodes.h"
#include "gen_sparc_new_nodes.h"

#include "gen_sparc_regalloc_if.h"
#include "sparc_cconv.h"

DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)

static const arch_register_t *sp_reg = &sparc_registers[REG_SP];
static const arch_register_t *fp_reg = &sparc_registers[REG_FP];
static calling_convention_t  *current_cconv = NULL;
static be_stackorder_t       *stackorder;
static ir_mode               *mode_gp;
static ir_mode               *mode_flags;
static ir_mode               *mode_fp;
static ir_mode               *mode_fp2;
//static ir_mode               *mode_fp4;
static pmap                  *node_to_stack;
static be_start_info_t        start_mem;
static be_start_info_t        start_val[N_SPARC_REGISTERS];
static ir_node               *frame_base;
static size_t                 start_callee_saves_offset;

static const arch_register_t *const omit_fp_callee_saves[] = {
	&sparc_registers[REG_L0],
	&sparc_registers[REG_L1],
	&sparc_registers[REG_L2],
	&sparc_registers[REG_L3],
	&sparc_registers[REG_L4],
	&sparc_registers[REG_L5],
	&sparc_registers[REG_L6],
	&sparc_registers[REG_L7],
	&sparc_registers[REG_I0],
	&sparc_registers[REG_I1],
	&sparc_registers[REG_I2],
	&sparc_registers[REG_I3],
	&sparc_registers[REG_I4],
	&sparc_registers[REG_I5],
};

static inline bool mode_needs_gp_reg(ir_mode *mode)
{
	if (mode_is_int(mode) || mode_is_reference(mode)) {
		/* we should only see 32bit code */
		assert(get_mode_size_bits(mode) <= 32);
		return true;
	}
	return false;
}

/**
 * Create an And that will zero out upper bits.
 *
 * @param dbgi      debug info
 * @param block     the basic block
 * @param op        the original node
 * @param src_bits  number of lower bits that will remain
 */
static ir_node *gen_zero_extension(dbg_info *dbgi, ir_node *block, ir_node *op,
                                   int src_bits)
{
	if (src_bits == 8) {
		return new_bd_sparc_And_imm(dbgi, block, op, NULL, 0xFF);
	} else if (src_bits == 16) {
		ir_node *lshift = new_bd_sparc_Sll_imm(dbgi, block, op, NULL, 16);
		ir_node *rshift = new_bd_sparc_Srl_imm(dbgi, block, lshift, NULL, 16);
		return rshift;
	} else {
		panic("zero extension only supported for 8 and 16 bits");
	}
}

/**
 * Generate code for a sign extension.
 *
 * @param dbgi      debug info
 * @param block     the basic block
 * @param op        the original node
 * @param src_bits  number of lower bits that will remain
 */
static ir_node *gen_sign_extension(dbg_info *dbgi, ir_node *block, ir_node *op,
                                   int src_bits)
{
	int shift_width = 32 - src_bits;
	ir_node *lshift_node = new_bd_sparc_Sll_imm(dbgi, block, op, NULL, shift_width);
	ir_node *rshift_node = new_bd_sparc_Sra_imm(dbgi, block, lshift_node, NULL, shift_width);
	return rshift_node;
}

/**
 * Extend a value to 32 bit signed/unsigned depending on its mode.
 *
 * @param dbgi      debug info
 * @param block     the basic block
 * @param op        the original node
 * @param orig_mode the original mode of op
 */
static ir_node *gen_extension(dbg_info *dbgi, ir_node *block, ir_node *op,
                              ir_mode *orig_mode)
{
	int bits = get_mode_size_bits(orig_mode);
	assert(bits < 32);

	if (mode_is_signed(orig_mode)) {
		return gen_sign_extension(dbgi, block, op, bits);
	} else {
		return gen_zero_extension(dbgi, block, op, bits);
	}
}

typedef enum {
	MATCH_NONE          = 0,
	MATCH_COMMUTATIVE   = 1U << 0, /**< commutative operation. */
	MATCH_MODE_NEUTRAL  = 1U << 1, /**< the higher bits of the inputs don't
	                                    influence the significant lower bit at
	                                    all (for cases where mode < 32bit) */
	MATCH_SIGN_EXT_LEFT = 1U << 2, /**< we need to sign-extend the left operand
	                                    (for cases when mode < 32bit) */
	MATCH_ZERO_EXT_LEFT = 1U << 3, /**< we need to zero-extend the left operand
                                            (for cases when mode < 32bit) */
} match_flags_t;
ENUM_BITSET(match_flags_t)

typedef ir_node* (*new_binop_reg_func) (dbg_info *dbgi, ir_node *block, ir_node *op1, ir_node *op2);
typedef ir_node* (*new_binop_fp_func) (dbg_info *dbgi, ir_node *block, ir_node *op1, ir_node *op2, ir_mode *mode);
typedef ir_node* (*new_binop_imm_func) (dbg_info *dbgi, ir_node *block, ir_node *op1, ir_entity *entity, int32_t immediate);
typedef ir_node* (*new_unop_fp_func) (dbg_info *dbgi, ir_node *block, ir_node *op1, ir_mode *mode);

/**
 * checks if a node's value can be encoded as a immediate
 */
static bool is_imm_encodeable(const ir_node *node)
{
	if (!is_Const(node))
		return false;

	long const value = get_Const_long(node);
	return sparc_is_value_imm_encodeable(value);
}

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

static void sparc_parse_constraint_letter(void const *const env, be_asm_constraint_t* const c, char const l)
{
	(void)env;

	switch (l) {
	case 'r':
		c->cls                   = &sparc_reg_classes[CLASS_sparc_gp];
		c->all_registers_allowed = true;
		break;

	case 'e':
	case 'f':
		c->cls                   = &sparc_reg_classes[CLASS_sparc_fp];
		c->all_registers_allowed = true;
		break;

	case 'g':
		c->all_registers_allowed = true;
		c->memory_possible       = true;
		/* FALLTHROUGH */
	case 'A':
	case 'I':
	case 'J':
	case 'L':
	case 'M':
	case 'O':
	case 'P':
	case 'i':
	case 'n':
		c->cls            = &sparc_reg_classes[CLASS_sparc_gp];
		c->immediate_type = l;
		break;

	case 'm':
	case 'w':
		c->memory_possible = true;
		break;

	default:
		panic("unknown asm constraint '%c'", l);
	}
}

static void parse_asm_constraints(be_asm_constraint_t *const constraint, ident *const constraint_text, bool const is_output)
{
	be_parse_asm_constraints_internal(constraint, constraint_text, is_output, &sparc_parse_constraint_letter, NULL);
}

static const arch_register_t *find_register(const char *name)
{
	for (size_t i = 0; i < N_SPARC_REGISTERS; ++i) {
		const arch_register_t *const reg = &sparc_registers[i];
		if (strcmp(reg->name, name) == 0)
			return reg;
	}
	return NULL;
}

void sparc_init_asm_constraints(void)
{
	be_set_constraint_support(ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER,  "0123456789efr");
	be_set_constraint_support(ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE, "AIJLMOPin");
	be_set_constraint_support(ASM_CONSTRAINT_FLAG_SUPPORTS_ANY,       "g");
	be_set_constraint_support(ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP,     "mw");
	/* Note there are many more flags in gcc which we can't properly support
	 * at the moment. see gcc/config/sparc/constraints.md */
}

int sparc_is_valid_clobber(const char *clobber)
{
	return strcmp(clobber, "memory") == 0 || strcmp(clobber, "cc") == 0;
}

static bool sparc_check_immediate_constraint(long const val, char const imm_type)
{
	switch (imm_type) {
	case 'A': return   -16 <= val && val <   16;
	case 'I': return sparc_is_value_imm_encodeable(val);
	case 'J': return val ==    0;
	case 'L': return -1024 <= val && val < 1024;
	case 'M': return  -512 <= val && val <  512;
	case 'O': return val == 4096;
	case 'P': return val ==   -1;

	case 'g':
	case 'i':
	case 'n': return true;
	}
	panic("invalid immediate constraint found");
}

static bool sparc_match_immediate(sparc_asm_operand_t *const operand, ir_node *const node, char const imm_type)
{
	ir_tarval *offset;
	ir_entity *entity;
	if (!be_match_immediate(node, &offset, &entity))
		return false;

	if (entity && imm_type != 'g' && imm_type != 'i')
		return false;

	long value;
	if (offset) {
		value = get_tarval_long(offset);
		if (!sparc_check_immediate_constraint(value, imm_type))
			return false;
	} else {
		value = 0;
	}

	operand->kind                   = ASM_OPERAND_IMMEDIATE;
	operand->immediate_value        = value;
	operand->immediate_value_entity = entity;
	return true;
}

static ir_node *gen_ASM(ir_node *node)
{
	ident   **clobbers     = get_ASM_clobbers(node);
	//unsigned  clobber_bits[BITSET_SIZE_ELEMS(N_SPARC_REGISTERS)];

	for (size_t c = 0; c < get_ASM_n_clobbers(node); ++c) {
		const char *const clobber = get_id_str(clobbers[c]);
		if (strcmp(clobber, "memory") == 0)
			continue;
		if (strcmp(clobber, "cc") == 0) {
			continue;
		}

		const arch_register_t *reg = find_register(clobber);
		if (reg == NULL)
			panic("invalid clobber in sparc asm");

#if 0
		rbitset_set(clobber_bits, reg->global_index);
#else
		panic("clobbers not correctly supported yet");
#endif
	}

	unsigned             const n_operands = be_count_asm_operands(node);
	ir_graph            *const irg        = get_irn_irg(node);
	struct obstack      *const obst       = get_irg_obstack(irg);
	sparc_asm_operand_t *const operands   = NEW_ARR_DZ(sparc_asm_operand_t, obst, n_operands);

	int                      n_inputs          = get_ASM_n_inputs(node);
	size_t                   n_out_constraints = get_ASM_n_output_constraints(node);
	ir_asm_constraint const *in_constraints    = get_ASM_input_constraints(node);
	ir_asm_constraint const *out_constraints   = get_ASM_output_constraints(node);

	/* construct output constraints */
	arch_register_req_t const **out_reqs = NEW_ARR_F(arch_register_req_t const*, 0);

	size_t out_idx;
	for (out_idx = 0; out_idx < n_out_constraints; ++out_idx) {
		const ir_asm_constraint *constraint = &out_constraints[out_idx];
		unsigned                 pos        = constraint->pos;
		be_asm_constraint_t      parsed_constraint;
		parse_asm_constraints(&parsed_constraint, constraint->constraint, true);

		assert(parsed_constraint.immediate_type == 0);
		arch_register_req_t const *const req = be_make_register_req(obst, &parsed_constraint, n_out_constraints, out_reqs, out_idx);
		ARR_APP1(arch_register_req_t const*, out_reqs, req);

		/* TODO: adjust register_req for clobbers */

		sparc_asm_operand_t *const operand = &operands[pos];
		operand->kind = ASM_OPERAND_OUTPUT_VALUE;
		operand->pos  = out_idx;
	}

	/* inputs + input constraints */
	ir_node                   **in      = NEW_ARR_F(ir_node*, 0);
	arch_register_req_t const **in_reqs = NEW_ARR_F(arch_register_req_t const*, 0);
	for (int i = 0; i < n_inputs; ++i) {
		ir_node                 *pred         = get_ASM_input(node, i);
		const ir_asm_constraint *constraint   = &in_constraints[i];
		unsigned                 pos          = constraint->pos;

		be_asm_constraint_t parsed_constraint;
		parse_asm_constraints(&parsed_constraint, constraint->constraint, false);

		sparc_asm_operand_t *const operand = &operands[pos];

		/* try to use an immediate value */
		char imm_type = parsed_constraint.immediate_type;
		if (imm_type != '\0' && sparc_match_immediate(operand, pred, imm_type))
			continue;

		ir_node             *const new_pred = be_transform_node(pred);
		operand_kind_t             kind     = ASM_OPERAND_INPUT_VALUE;
		arch_register_req_t const *req      = be_make_register_req(obst, &parsed_constraint, n_out_constraints, out_reqs, i);
		if (req == arch_no_register_req) {
			kind = ASM_OPERAND_MEMORY;
			req  = arch_get_irn_register_req(new_pred)->cls->class_req;
		}

		operand->kind = kind;
		operand->pos  = ARR_LEN(in);
		ARR_APP1(ir_node*, in, new_pred);
		ARR_APP1(arch_register_req_t const*, in_reqs, req);
	}

	/* parse clobbers */
	for (size_t c = 0; c < get_ASM_n_clobbers(node); ++c) {
		const char *const clobber = get_id_str(clobbers[c]);
		if (strcmp(clobber, "memory") == 0)
			continue;
		if (strcmp(clobber, "cc") == 0) {
			ARR_APP1(arch_register_req_t const*, out_reqs, sparc_registers[REG_PSR].single_req);
			ARR_APP1(arch_register_req_t const*, out_reqs, sparc_registers[REG_FSR].single_req);
			continue;
		}

		const arch_register_t *reg = find_register(clobber);
		assert(reg != NULL); /* otherwise we had a panic earlier */
		ARR_APP1(arch_register_req_t const*, out_reqs, reg->single_req);
	}

	return be_make_asm(node, in, in_reqs, out_reqs, operands);
}

/* Transforms the left operand of a binary operation.
 *
 * Performs sign/zero extension if necessary.
 */
static ir_node *gen_helper_binop_left(ir_node *left, dbg_info *dbgi,
                                      ir_node *block, match_flags_t flags)
{
	ir_mode *mode     = get_irn_mode(left);
	ir_node *new_left = be_transform_node(left);

	if (flags & MATCH_MODE_NEUTRAL)
		return new_left;

	int bits    = get_mode_size_bits(mode);
	int gp_bits = get_mode_size_bits(mode_gp);

	if (bits >= gp_bits)
		return new_left;

	if (flags & MATCH_SIGN_EXT_LEFT) {
		if (!mode_is_signed(mode) || needs_extension(left)) {
			return gen_sign_extension(dbgi, block, new_left, bits);
		}
	} else if (flags & MATCH_ZERO_EXT_LEFT) {
		if (mode_is_signed(mode) || needs_extension(left)) {
			return gen_zero_extension(dbgi, block, new_left, bits);
		}
	} else if (needs_extension(left)) {
		return gen_extension(dbgi, block, new_left, mode);
	}

	return new_left;
}

/**
 * helper function for binop operations
 *
 * @param new_reg  register generation function ptr
 * @param new_imm  immediate generation function ptr
 */
static ir_node *gen_helper_binop_args(ir_node *node,
                                      ir_node *op1, ir_node *op2,
                                      match_flags_t flags,
                                      new_binop_reg_func new_reg,
                                      new_binop_imm_func new_imm)
{
	dbg_info *dbgi  = get_irn_dbg_info(node);
	ir_node  *block = be_transform_nodes_block(node);

	if (flags & MATCH_MODE_NEUTRAL) {
		op1 = be_skip_downconv(op1, false);
		op2 = be_skip_downconv(op2, false);
	}
	ir_mode *mode2 = get_irn_mode(op2);
	/* we should not see 64bit code */
	assert(get_mode_size_bits(get_irn_mode(op1)) <= 32);
	assert(get_mode_size_bits(mode2) <= 32);

	if (is_imm_encodeable(op2)) {
		int32_t  const immediate = get_Const_long(op2);
		ir_node *const new_op1   = gen_helper_binop_left(op1, dbgi, block, flags);
		return new_imm(dbgi, block, new_op1, NULL, immediate);
	}
	ir_node *new_op2 = be_transform_node(op2);
	if (! (flags & MATCH_MODE_NEUTRAL) && needs_extension(op2)) {
		new_op2 = gen_extension(dbgi, block, new_op2, mode2);
	}

	if ((flags & MATCH_COMMUTATIVE) && is_imm_encodeable(op1)) {
		int32_t const immediate = get_Const_long(op1);
		return new_imm(dbgi, block, new_op2, NULL, immediate);
	}

	ir_node *new_op1 = gen_helper_binop_left(op1, dbgi, block, flags);
	return new_reg(dbgi, block, new_op1, new_op2);
}

static ir_node *gen_helper_binop(ir_node *node, match_flags_t flags,
                                 new_binop_reg_func new_reg,
                                 new_binop_imm_func new_imm)
{
	ir_node *op1 = get_binop_left(node);
	ir_node *op2 = get_binop_right(node);
	return gen_helper_binop_args(node, op1, op2, flags, new_reg, new_imm);
}

/**
 * helper function for FP binop operations
 */
static ir_node *gen_helper_binfpop(ir_node *node, ir_mode *mode,
                                   new_binop_fp_func new_func_single,
                                   new_binop_fp_func new_func_double,
                                   new_binop_fp_func new_func_quad)
{
	ir_node  *block   = be_transform_nodes_block(node);
	ir_node  *op1     = get_binop_left(node);
	ir_node  *new_op1 = be_transform_node(op1);
	ir_node  *op2     = get_binop_right(node);
	ir_node  *new_op2 = be_transform_node(op2);
	dbg_info *dbgi    = get_irn_dbg_info(node);
	unsigned  bits    = get_mode_size_bits(mode);

	switch (bits) {
	case 32:
		return new_func_single(dbgi, block, new_op1, new_op2, mode);
	case 64:
		return new_func_double(dbgi, block, new_op1, new_op2, mode);
	case 128:
		return new_func_quad(dbgi, block, new_op1, new_op2, mode);
	default:
		break;
	}
	panic("unsupported mode %+F for float op", mode);
}

typedef ir_node* (*new_binopx_imm_func)(dbg_info *dbgi, ir_node *block,
                                        ir_node *op1, ir_node *flags,
                                        ir_entity *imm_entity, int32_t imm);

typedef ir_node* (*new_binopx_reg_func)(dbg_info *dbgi, ir_node *block,
                                        ir_node *op1, ir_node *op2,
                                        ir_node *flags);

static ir_node *gen_helper_binopx(ir_node *node, match_flags_t match_flags,
                                  new_binopx_reg_func new_binopx_reg,
                                  new_binopx_imm_func new_binopx_imm)
{
	dbg_info *dbgi      = get_irn_dbg_info(node);
	ir_node  *block     = be_transform_nodes_block(node);
	ir_node  *op1       = get_irn_n(node, 0);
	ir_node  *op2       = get_irn_n(node, 1);
	ir_node  *flags     = get_irn_n(node, 2);
	ir_node  *new_flags = be_transform_node(flags);

	/* only support for mode-neutral implemented so far */
	assert(match_flags & MATCH_MODE_NEUTRAL);

	if (is_imm_encodeable(op2)) {
		int32_t  const immediate = get_Const_long(op2);
		ir_node *const new_op1   = be_transform_node(op1);
		return new_binopx_imm(dbgi, block, new_op1, new_flags, NULL, immediate);
	}
	ir_node *new_op2 = be_transform_node(op2);
	if ((match_flags & MATCH_COMMUTATIVE) && is_imm_encodeable(op1)) {
		int32_t const immediate = get_Const_long(op1);
		return new_binopx_imm(dbgi, block, new_op2, new_flags, NULL, immediate);
	}
	ir_node *new_op1 = be_transform_node(op1);
	return new_binopx_reg(dbgi, block, new_op1, new_op2, new_flags);

}

static ir_node *get_g0(ir_graph *irg)
{
	return be_get_start_proj(irg, &start_val[REG_G0]);
}

static ir_node *get_g7(ir_graph *irg)
{
	return be_get_start_proj(irg, &start_val[REG_G7]);
}

static ir_node *make_tls_offset(dbg_info *dbgi, ir_node *block,
                                ir_entity *entity, int32_t offset)
{
	ir_node  *hi  = new_bd_sparc_SetHi(dbgi, block, entity, offset);
	ir_node  *low = new_bd_sparc_Xor_imm(dbgi, block, hi, entity, offset);
	return low;
}

static ir_node *make_address(dbg_info *dbgi, ir_node *block, ir_entity *entity,
                             int32_t offset)
{
	if (is_tls_entity(entity)) {
		ir_graph *irg     = get_irn_irg(block);
		ir_node  *g7      = get_g7(irg);
		ir_node  *offsetn = make_tls_offset(dbgi, block, entity, offset);
		ir_node  *add     = new_bd_sparc_Add_reg(dbgi, block, g7, offsetn);
		return add;
	} else {
		ir_node *hi  = new_bd_sparc_SetHi(dbgi, block, entity, offset);
		ir_node *low = new_bd_sparc_Or_imm(dbgi, block, hi, entity, offset);
		return low;
	}
}

typedef struct address_t {
	ir_node   *ptr;
	ir_node   *ptr2;
	ir_entity *entity;
	int32_t    offset;
} address_t;

/**
 * Match a load/store address
 */
static void match_address(ir_node *ptr, address_t *address, bool use_ptr2)
{
	ir_node   *base   = ptr;
	int32_t    offset = 0;

	if (is_Add(base)) {
		ir_node *add_right = get_Add_right(base);
		if (is_Const(add_right)) {
			base    = get_Add_left(base);
			offset += get_Const_long(add_right);
		}
	}
	/* Note that we don't match sub(x, Const) or chains of adds/subs
	 * because this should all be normalized by now */

	/* we only use the entity if we're the only user otherwise we probably
	 * won't save anything but produce multiple sethi+or combinations with
	 * just different offsets */
	ir_node   *ptr2   = NULL;
	ir_entity *entity = NULL;
	if (is_Address(base) && get_irn_n_edges(base) == 1) {
		ir_entity *sc_entity = get_Address_entity(base);
		dbg_info  *dbgi      = get_irn_dbg_info(ptr);
		ir_node   *new_block = be_transform_nodes_block(ptr);

		if (is_tls_entity(sc_entity)) {
			if (!use_ptr2) {
				goto only_offset;
			} else {
				ptr2   = make_tls_offset(dbgi, new_block, sc_entity, offset);
				offset = 0;
				base   = get_g7(get_irn_irg(base));
			}
		} else {
			entity = sc_entity;
			base   = new_bd_sparc_SetHi(dbgi, new_block, entity, offset);
		}
	} else if (use_ptr2 && is_Add(base) && offset == 0) {
		ptr2 = be_transform_node(get_Add_right(base));
		base = be_transform_node(get_Add_left(base));
	} else {
only_offset:
		if (sparc_is_value_imm_encodeable(offset)) {
			base = be_transform_node(base);
		} else {
			base   = be_transform_node(ptr);
			offset = 0;
		}
	}

	address->ptr    = base;
	address->ptr2   = ptr2;
	address->entity = entity;
	address->offset = offset;
}

static ir_node *gen_Proj_ASM(ir_node *node)
{
	ir_mode *mode     = get_irn_mode(node);
	ir_node *pred     = get_Proj_pred(node);
	ir_node *new_pred = be_transform_node(pred);
	unsigned pn       = get_Proj_num(node);

	if (mode == mode_M) {
		pn = arch_get_irn_n_outs(new_pred)-1;
	} else if (mode_needs_gp_reg(mode)) {
		mode = mode_gp;
	} else {
		panic("unexpected proj mode at ASM");
	}

	return new_r_Proj(new_pred, mode, pn);
}

/**
 * Creates an sparc Add.
 *
 * @param node   FIRM node
 * @return the created sparc Add node
 */
static ir_node *gen_Add(ir_node *node)
{
	ir_mode *mode = get_irn_mode(node);
	if (mode_is_float(mode)) {
		return gen_helper_binfpop(node, mode, new_bd_sparc_fadd_s,
		                          new_bd_sparc_fadd_d, new_bd_sparc_fadd_q);
	}

	/* special case: + 0x1000 can be represented as - 0x1000 */
	ir_node *right = get_Add_right(node);
	if (is_Const(right)) {
		ir_node   *left = get_Add_left(node);
		/* is this simple address arithmetic? then we can let the linker do
		 * the calculation. */
		if (is_Address(left) && get_irn_n_edges(left) == 1) {
			dbg_info *dbgi  = get_irn_dbg_info(node);
			ir_node  *block = be_transform_nodes_block(node);

			/* the value of use_ptr2 shouldn't matter here */
			address_t address;
			match_address(node, &address, false);
			assert(is_sparc_SetHi(address.ptr));
			return new_bd_sparc_Or_imm(dbgi, block, address.ptr,
			                           address.entity, address.offset);
		}

		uint32_t const val = get_Const_long(right);
		if (val == 0x1000) {
			dbg_info *dbgi   = get_irn_dbg_info(node);
			ir_node  *block  = be_transform_nodes_block(node);
			ir_node  *op     = get_Add_left(node);
			ir_node  *new_op = be_transform_node(op);
			return new_bd_sparc_Sub_imm(dbgi, block, new_op, NULL, -0x1000);
		}
	}

	return gen_helper_binop(node, MATCH_COMMUTATIVE | MATCH_MODE_NEUTRAL,
	                        new_bd_sparc_Add_reg, new_bd_sparc_Add_imm);
}

static ir_node *gen_AddCC_t(ir_node *node)
{
	ir_node *left     = get_irn_n(node, n_sparc_AddCC_t_left);
	ir_node *right    = get_irn_n(node, n_sparc_AddCC_t_right);
	ir_node *new_node = gen_helper_binop_args(node, left, right,
	                             MATCH_COMMUTATIVE | MATCH_MODE_NEUTRAL,
	                             new_bd_sparc_AddCC_reg, new_bd_sparc_AddCC_imm);
	arch_set_irn_register_out(new_node, pn_sparc_AddCC_flags, &sparc_registers[REG_PSR]);

	return new_node;
}

static ir_node *gen_Proj_AddCC_t(ir_node *node)
{
	unsigned pn       = get_Proj_num(node);
	ir_node *pred     = get_Proj_pred(node);
	ir_node *new_pred = be_transform_node(pred);

	switch (pn) {
	case pn_sparc_AddCC_t_res:
		return new_r_Proj(new_pred, mode_gp, pn_sparc_AddCC_res);
	case pn_sparc_AddCC_t_flags:
		return new_r_Proj(new_pred, mode_flags, pn_sparc_AddCC_flags);
	default:
		panic("invalid proj found");
	}
}

static ir_node *gen_AddX_t(ir_node *node)
{
	return gen_helper_binopx(node, MATCH_COMMUTATIVE | MATCH_MODE_NEUTRAL,
	                         new_bd_sparc_AddX_reg, new_bd_sparc_AddX_imm);
}

/**
 * Creates an sparc Sub.
 *
 * @param node       FIRM node
 * @return the created sparc Sub node
 */
static ir_node *gen_Sub(ir_node *node)
{
	ir_mode *mode = get_irn_mode(node);
	if (mode_is_float(mode)) {
		return gen_helper_binfpop(node, mode, new_bd_sparc_fsub_s,
		                          new_bd_sparc_fsub_d, new_bd_sparc_fsub_q);
	}

	return gen_helper_binop(node, MATCH_MODE_NEUTRAL,
	                        new_bd_sparc_Sub_reg, new_bd_sparc_Sub_imm);
}

static ir_node *gen_SubCC_t(ir_node *node)
{
	ir_node *left     = get_irn_n(node, n_sparc_SubCC_t_left);
	ir_node *right    = get_irn_n(node, n_sparc_SubCC_t_right);
	ir_node *new_node = gen_helper_binop_args(node, left, right, MATCH_MODE_NEUTRAL,
	                             new_bd_sparc_SubCC_reg, new_bd_sparc_SubCC_imm);
	arch_set_irn_register_out(new_node, pn_sparc_SubCC_flags, &sparc_registers[REG_PSR]);

	return new_node;
}

static ir_node *gen_Proj_SubCC_t(ir_node *node)
{
	unsigned pn       = get_Proj_num(node);
	ir_node *pred     = get_Proj_pred(node);
	ir_node *new_pred = be_transform_node(pred);

	switch (pn) {
	case pn_sparc_SubCC_t_res:
		return new_r_Proj(new_pred, mode_gp, pn_sparc_SubCC_res);
	case pn_sparc_SubCC_t_flags:
		return new_r_Proj(new_pred, mode_flags, pn_sparc_SubCC_flags);
	default:
		panic("invalid proj found");
	}
}

static ir_node *gen_SubX_t(ir_node *node)
{
	return gen_helper_binopx(node, MATCH_MODE_NEUTRAL,
	                         new_bd_sparc_SubX_reg, new_bd_sparc_SubX_imm);
}

ir_node *create_ldf(dbg_info *dbgi, ir_node *block, ir_node *ptr,
                    ir_node *mem, ir_mode *mode, ir_entity *entity,
                    long offset, bool is_frame_entity)
{
	unsigned bits = get_mode_size_bits(mode);
	assert(mode_is_float(mode));
	if (bits == 32) {
		return new_bd_sparc_Ldf_s(dbgi, block, ptr, mem, mode, entity,
		                          offset, is_frame_entity);
	} else if (bits == 64) {
		return new_bd_sparc_Ldf_d(dbgi, block, ptr, mem, mode, entity,
		                          offset, is_frame_entity);
	} else {
		assert(bits == 128);
		return new_bd_sparc_Ldf_q(dbgi, block, ptr, mem, mode, entity,
		                          offset, is_frame_entity);
	}
}

ir_node *create_stf(dbg_info *dbgi, ir_node *block, ir_node *value,
                    ir_node *ptr, ir_node *mem, ir_mode *mode,
                    ir_entity *entity, long offset,
                    bool is_frame_entity)
{
	unsigned bits = get_mode_size_bits(mode);
	assert(mode_is_float(mode));
	if (bits == 32) {
		return new_bd_sparc_Stf_s(dbgi, block, value, ptr, mem, mode, entity,
		                          offset, is_frame_entity);
	} else if (bits == 64) {
		return new_bd_sparc_Stf_d(dbgi, block, value, ptr, mem, mode, entity,
		                          offset, is_frame_entity);
	} else {
		assert(bits == 128);
		return new_bd_sparc_Stf_q(dbgi, block, value, ptr, mem, mode, entity,
		                          offset, is_frame_entity);
	}
}

/**
 * Transforms a Load.
 *
 * @param node    the ir Load node
 * @return the created sparc Load node
 */
static ir_node *gen_Load(ir_node *node)
{
	dbg_info *dbgi     = get_irn_dbg_info(node);
	ir_mode  *mode     = get_Load_mode(node);
	ir_node  *block    = be_transform_nodes_block(node);
	ir_node  *ptr      = get_Load_ptr(node);
	ir_node  *mem      = get_Load_mem(node);
	ir_node  *new_mem  = be_transform_node(mem);

	if (get_Load_unaligned(node) == align_non_aligned) {
		panic("transformation of unaligned Loads not implemented yet");
	}

	ir_node  *new_load;
	if (mode_is_float(mode)) {
		address_t address;
		match_address(ptr, &address, false);
		new_load = create_ldf(dbgi, block, address.ptr, new_mem, mode,
		                      address.entity, address.offset, false);
	} else {
		address_t address;
		match_address(ptr, &address, true);
		if (address.ptr2 != NULL) {
			assert(address.entity == NULL && address.offset == 0);
			new_load = new_bd_sparc_Ld_reg(dbgi, block, address.ptr,
			                               address.ptr2, new_mem, mode);
		} else {
			new_load = new_bd_sparc_Ld_imm(dbgi, block, address.ptr, new_mem,
			                               mode, address.entity, address.offset,
			                               false);
		}
	}
	set_irn_pinned(new_load, get_irn_pinned(node));

	return new_load;
}

/**
 * Transforms a Store.
 *
 * @param node    the ir Store node
 * @return the created sparc Store node
 */
static ir_node *gen_Store(ir_node *node)
{
	ir_node  *block    = be_transform_nodes_block(node);
	ir_node  *ptr      = get_Store_ptr(node);
	ir_node  *mem      = get_Store_mem(node);
	ir_node  *new_mem  = be_transform_node(mem);
	ir_node  *val      = get_Store_value(node);
	ir_mode  *mode     = get_irn_mode(val);
	dbg_info *dbgi     = get_irn_dbg_info(node);

	if (get_Store_unaligned(node) == align_non_aligned) {
		panic("transformation of unaligned Stores not implemented yet");
	}

	ir_node  *new_store;
	if (mode_is_float(mode)) {
		ir_node *new_val = be_transform_node(val);
		/* TODO: variants with reg+reg address mode */
		address_t address;
		match_address(ptr, &address, false);
		new_store = create_stf(dbgi, block, new_val, address.ptr, new_mem,
		                       mode, address.entity, address.offset, false);
	} else {
		val = be_skip_downconv(val, false);
		ir_node *new_val = be_transform_node(val);

		assert(get_mode_size_bits(mode) <= 32);
		address_t address;
		match_address(ptr, &address, true);
		if (address.ptr2 != NULL) {
			assert(address.entity == NULL && address.offset == 0);
			new_store = new_bd_sparc_St_reg(dbgi, block, new_val, address.ptr,
			                                address.ptr2, new_mem, mode);
		} else {
			new_store = new_bd_sparc_St_imm(dbgi, block, new_val, address.ptr,
			                                new_mem, mode, address.entity,
			                                address.offset, false);
		}
	}
	set_irn_pinned(new_store, get_irn_pinned(node));

	return new_store;
}

/**
 * Creates an sparc Mul.
 * returns the lower 32bits of the 64bit multiply result
 *
 * @return the created sparc Mul node
 */
static ir_node *gen_Mul(ir_node *node)
{
	ir_mode *mode = get_irn_mode(node);
	if (mode_is_float(mode)) {
		return gen_helper_binfpop(node, mode, new_bd_sparc_fmul_s,
		                          new_bd_sparc_fmul_d, new_bd_sparc_fmul_q);
	}

	return gen_helper_binop(node, MATCH_COMMUTATIVE | MATCH_MODE_NEUTRAL,
	                        new_bd_sparc_Mul_reg, new_bd_sparc_Mul_imm);
}

/**
 * Creates an sparc Mulh.
 * Mulh returns the upper 32bits of a mul instruction
 *
 * @return the created sparc Mulh node
 */
static ir_node *gen_Mulh(ir_node *node)
{
	ir_mode *mode = get_irn_mode(node);
	if (mode_is_float(mode))
		panic("FP not supported yet");

	if (mode_is_signed(mode)) {
		return gen_helper_binop(node, MATCH_COMMUTATIVE, new_bd_sparc_SMulh_reg, new_bd_sparc_SMulh_imm);
	} else {
		return gen_helper_binop(node, MATCH_COMMUTATIVE, new_bd_sparc_UMulh_reg, new_bd_sparc_UMulh_imm);
	}
}

static ir_node *gen_sign_extension_value(ir_node *node)
{
	ir_node *new_block = be_transform_nodes_block(node);
	ir_node *new_node  = be_transform_node(node);
	/* TODO: we could do some shortcuts for some value types probably.
	 * (For constants or other cases where we know the sign bit in
	 *  advance) */
	return new_bd_sparc_Sra_imm(NULL, new_block, new_node, NULL, 31);
}

/**
 * Creates an sparc Div.
 *
 * @return the created sparc Div node
 */
static ir_node *gen_Div(ir_node *node)
{
	dbg_info *dbgi      = get_irn_dbg_info(node);
	ir_node  *new_block = be_transform_nodes_block(node);
	ir_mode  *mode      = get_Div_resmode(node);
	ir_node  *left      = get_Div_left(node);
	ir_node  *left_low  = be_transform_node(left);
	ir_node  *right     = get_Div_right(node);