ia32_emitter.c 54.4 KB
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/*
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 * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
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 *
 * This file is part of libFirm.
 *
 * This file may be distributed and/or modified under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation and appearing in the file LICENSE.GPL included in the
 * packaging of this file.
 *
 * Licensees holding valid libFirm Professional Edition licenses may use
 * this file in accordance with the libFirm Commercial License.
 * Agreement provided with the Software.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.
 */

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/**
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 * @file
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 * @brief       This file implements the ia32 node emitter.
 * @author      Christian Wuerdig, Matthias Braun
 * @version     $Id$
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 */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif

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#include <limits.h>

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#include "xmalloc.h"
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#include "tv.h"
#include "iredges.h"
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#include "debug.h"
#include "irgwalk.h"
#include "irprintf.h"
#include "irop_t.h"
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#include "irargs_t.h"
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#include "irprog_t.h"
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#include "iredges_t.h"
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#include "execfreq.h"
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#include "error.h"
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#include "raw_bitset.h"
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#include "dbginfo.h"
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#include "../besched_t.h"
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#include "../benode_t.h"
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#include "../beabi.h"
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#include "../be_dbgout.h"
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#include "../beemitter.h"
#include "../begnuas.h"
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#include "../beirg_t.h"
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#include "../be_dbgout.h"
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#include "ia32_emitter.h"
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#include "gen_ia32_emitter.h"
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#include "gen_ia32_regalloc_if.h"
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#include "ia32_nodes_attr.h"
#include "ia32_new_nodes.h"
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#include "ia32_map_regs.h"
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#include "ia32_architecture.h"
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#include "bearch_ia32_t.h"
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DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)

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#define BLOCK_PREFIX ".L"
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#define SNPRINTF_BUF_LEN 128

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static const arch_env_t *arch_env;
static const ia32_isa_t *isa;
static ia32_code_gen_t  *cg;
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static int               do_pic;
static char              pic_base_label[128];
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static ir_label_t        exc_label_id;
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/** Return the next block in Block schedule */
static ir_node *get_prev_block_sched(const ir_node *block)
{
	return get_irn_link(block);
}

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static int is_fallthrough(const ir_node *cfgpred)
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{
	ir_node *pred;

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	if (!is_Proj(cfgpred))
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		return 1;
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	pred = get_Proj_pred(cfgpred);
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	if (is_ia32_SwitchJmp(pred))
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		return 0;
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	return 1;
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}

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static int block_needs_label(const ir_node *block)
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{
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	int need_label = 1;
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	int  n_cfgpreds = get_Block_n_cfgpreds(block);

	if (n_cfgpreds == 0) {
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		need_label = 0;
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	} else if (n_cfgpreds == 1) {
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		ir_node *cfgpred       = get_Block_cfgpred(block, 0);
		ir_node *cfgpred_block = get_nodes_block(cfgpred);
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		if (get_prev_block_sched(block) == cfgpred_block
				&& is_fallthrough(cfgpred)) {
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			need_label = 0;
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		}
	}

	return need_label;
}

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/**
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 * Returns the register at in position pos.
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 */
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static const arch_register_t *get_in_reg(const ir_node *irn, int pos)
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{
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	ir_node               *op;
	const arch_register_t *reg = NULL;
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	assert(get_irn_arity(irn) > pos && "Invalid IN position");

	/* The out register of the operator at position pos is the
	   in register we need. */
	op = get_irn_n(irn, pos);

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	reg = arch_get_irn_register(arch_env, op);
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	assert(reg && "no in register found");
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	if (reg == &ia32_gp_regs[REG_GP_NOREG])
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		panic("trying to emit noreg for %+F input %d", irn, pos);
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	/* in case of unknown register: just return a valid register */
	if (reg == &ia32_gp_regs[REG_GP_UKNWN]) {
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		const arch_register_req_t *req;
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		/* ask for the requirements */
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		req = arch_get_register_req(arch_env, irn, pos);
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		if (arch_register_req_is(req, limited)) {
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			/* in case of limited requirements: get the first allowed register */
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			unsigned idx = rbitset_next(req->limited, 0, 1);
			reg = arch_register_for_index(req->cls, idx);
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		} else {
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			/* otherwise get first register in class */
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			reg = arch_register_for_index(req->cls, 0);
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		}
	}
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	return reg;
}

/**
 * Returns the register at out position pos.
 */
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static const arch_register_t *get_out_reg(const ir_node *irn, int pos)
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{
	ir_node               *proj;
	const arch_register_t *reg = NULL;
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	/* 1st case: irn is not of mode_T, so it has only                 */
	/*           one OUT register -> good                             */
	/* 2nd case: irn is of mode_T -> collect all Projs and ask the    */
	/*           Proj with the corresponding projnum for the register */

	if (get_irn_mode(irn) != mode_T) {
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		assert(pos == 0);
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		reg = arch_get_irn_register(arch_env, irn);
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	} else if (is_ia32_irn(irn)) {
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		reg = get_ia32_out_reg(irn, pos);
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	} else {
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		const ir_edge_t *edge;

		foreach_out_edge(irn, edge) {
			proj = get_edge_src_irn(edge);
			assert(is_Proj(proj) && "non-Proj from mode_T node");
			if (get_Proj_proj(proj) == pos) {
				reg = arch_get_irn_register(arch_env, proj);
				break;
			}
		}
	}

	assert(reg && "no out register found");
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	return reg;
}

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/**
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 * Add a number to a prefix. This number will not be used a second time.
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 */
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static char *get_unique_label(char *buf, size_t buflen, const char *prefix)
{
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	static unsigned long id = 0;
	snprintf(buf, buflen, "%s%lu", prefix, ++id);
	return buf;
}

/*************************************************************
 *             _       _    __   _          _
 *            (_)     | |  / _| | |        | |
 *  _ __  _ __ _ _ __ | |_| |_  | |__   ___| |_ __   ___ _ __
 * | '_ \| '__| | '_ \| __|  _| | '_ \ / _ \ | '_ \ / _ \ '__|
 * | |_) | |  | | | | | |_| |   | | | |  __/ | |_) |  __/ |
 * | .__/|_|  |_|_| |_|\__|_|   |_| |_|\___|_| .__/ \___|_|
 * | |                                       | |
 * |_|                                       |_|
 *************************************************************/

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static void emit_8bit_register(const arch_register_t *reg)
{
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	const char *reg_name = arch_register_get_name(reg);
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	be_emit_char('%');
	be_emit_char(reg_name[1]);
	be_emit_char('l');
}

static void emit_16bit_register(const arch_register_t *reg)
{
	const char *reg_name = ia32_get_mapped_reg_name(isa->regs_16bit, reg);
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	be_emit_char('%');
	be_emit_string(reg_name);
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}

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static void emit_register(const arch_register_t *reg, const ir_mode *mode)
{
	const char *reg_name;

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	if (mode != NULL) {
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		int size = get_mode_size_bits(mode);
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		switch (size) {
			case  8: emit_8bit_register(reg);  return;
			case 16: emit_16bit_register(reg); return;
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		}
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		assert(mode_is_float(mode) || size == 32);
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	}

	reg_name = arch_register_get_name(reg);
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	be_emit_char('%');
	be_emit_string(reg_name);
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}

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void ia32_emit_source_register(const ir_node *node, int pos)
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{
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	const arch_register_t *reg = get_in_reg(node, pos);
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	emit_register(reg, NULL);
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}

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static void emit_ia32_Immediate(const ir_node *node);

void ia32_emit_8bit_source_register_or_immediate(const ir_node *node, int pos)
{
	const arch_register_t *reg;
	ir_node               *in = get_irn_n(node, pos);
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	if (is_ia32_Immediate(in)) {
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		emit_ia32_Immediate(in);
		return;
	}

	reg = get_in_reg(node, pos);
	emit_8bit_register(reg);
}

void ia32_emit_dest_register(const ir_node *node, int pos)
{
	const arch_register_t *reg  = get_out_reg(node, pos);

	emit_register(reg, NULL);
}

void ia32_emit_8bit_dest_register(const ir_node *node, int pos)
{
	const arch_register_t *reg  = get_out_reg(node, pos);

	emit_register(reg, mode_Bu);
}

void ia32_emit_x87_register(const ir_node *node, int pos)
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{
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	const ia32_x87_attr_t *attr = get_ia32_x87_attr_const(node);
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	assert(pos < 3);
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	be_emit_char('%');
	be_emit_string(attr->x87[pos]->name);
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}
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static void ia32_emit_mode_suffix_mode(const ir_mode *mode)
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{
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	if (mode_is_float(mode)) {
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		switch(get_mode_size_bits(mode)) {
		case 32: be_emit_char('s'); return;
		case 64: be_emit_char('l'); return;
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		case 80:
		case 96: be_emit_char('t'); return;
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		}
	} else {
		assert(mode_is_int(mode) || mode_is_reference(mode));
		switch(get_mode_size_bits(mode)) {
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		/* gas docu says q is the suffix but gcc, objdump and icc use ll
		 * apparently */
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		case 64: be_emit_cstring("ll"); return;
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		case 32: be_emit_char('l');     return;
		case 16: be_emit_char('w');     return;
		case 8:  be_emit_char('b');     return;
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		}
	}
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	panic("Can't output mode_suffix for %+F", mode);
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}

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void ia32_emit_mode_suffix(const ir_node *node)
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{
	ir_mode *mode = get_ia32_ls_mode(node);
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	if (mode == NULL)
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		mode = mode_Iu;

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	ia32_emit_mode_suffix_mode(mode);
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}

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void ia32_emit_x87_mode_suffix(const ir_node *node)
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{
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	/* we only need to emit the mode on address mode */
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	if (get_ia32_op_type(node) != ia32_Normal) {
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		ir_mode *mode = get_ia32_ls_mode(node);
		assert(mode != NULL);
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		ia32_emit_mode_suffix_mode(mode);
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	}
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}

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static char get_xmm_mode_suffix(ir_mode *mode)
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{
	assert(mode_is_float(mode));
	switch(get_mode_size_bits(mode)) {
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	case 32: return 's';
	case 64: return 'd';
	default: panic("Invalid XMM mode");
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	}
}

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void ia32_emit_xmm_mode_suffix(const ir_node *node)
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{
	ir_mode *mode = get_ia32_ls_mode(node);
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	assert(mode != NULL);
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	be_emit_char('s');
	be_emit_char(get_xmm_mode_suffix(mode));
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}

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void ia32_emit_xmm_mode_suffix_s(const ir_node *node)
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{
	ir_mode *mode = get_ia32_ls_mode(node);
	assert(mode != NULL);
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	be_emit_char(get_xmm_mode_suffix(mode));
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}

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void ia32_emit_extend_suffix(const ir_mode *mode)
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{
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	if (get_mode_size_bits(mode) == 32)
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		return;
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	be_emit_char(mode_is_signed(mode) ? 's' : 'z');
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}

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void ia32_emit_source_register_or_immediate(const ir_node *node, int pos)
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{
	ir_node *in = get_irn_n(node, pos);
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	if (is_ia32_Immediate(in)) {
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		emit_ia32_Immediate(in);
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	} else {
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		const ir_mode         *mode = get_ia32_ls_mode(node);
		const arch_register_t *reg  = get_in_reg(node, pos);
		emit_register(reg, mode);
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	}
}

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/**
 * Emits registers and/or address mode of a binary operation.
 */
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void ia32_emit_binop(const ir_node *node)
{
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	const ir_node         *right_op  = get_irn_n(node, n_ia32_binary_right);
	const ir_mode         *mode      = get_ia32_ls_mode(node);
	const arch_register_t *reg_left;
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	switch(get_ia32_op_type(node)) {
	case ia32_Normal:
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		reg_left = get_in_reg(node, n_ia32_binary_left);
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		if (is_ia32_Immediate(right_op)) {
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			emit_ia32_Immediate(right_op);
			be_emit_cstring(", ");
			emit_register(reg_left, mode);
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			break;
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		} else {
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			const arch_register_t *reg_right
				= get_in_reg(node, n_ia32_binary_right);
			emit_register(reg_right, mode);
			be_emit_cstring(", ");
			emit_register(reg_left, mode);
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		}
		break;
	case ia32_AddrModeS:
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		if (is_ia32_Immediate(right_op)) {
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			emit_ia32_Immediate(right_op);
			be_emit_cstring(", ");
			ia32_emit_am(node);
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		} else {
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			reg_left = get_in_reg(node, n_ia32_binary_left);
			ia32_emit_am(node);
			be_emit_cstring(", ");
			emit_register(reg_left, mode);
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		}
		break;
	case ia32_AddrModeD:
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		panic("DestMode can't be output by %%binop anymore");
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		break;
	default:
		assert(0 && "unsupported op type");
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	}
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}

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/**
 * Emits registers and/or address mode of a binary operation.
 */
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void ia32_emit_x87_binop(const ir_node *node)
{
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	switch(get_ia32_op_type(node)) {
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		case ia32_Normal:
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			{
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				const ia32_x87_attr_t *x87_attr = get_ia32_x87_attr_const(node);
				const arch_register_t *in1      = x87_attr->x87[0];
				const arch_register_t *in2      = x87_attr->x87[1];
				const arch_register_t *out      = x87_attr->x87[2];
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				const arch_register_t *in;

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				in  = out ? ((out == in2) ? in1 : in2) : in2;
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				out = out ? out : in1;
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				be_emit_char('%');
				be_emit_string(arch_register_get_name(in));
				be_emit_cstring(", %");
				be_emit_string(arch_register_get_name(out));
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			}
			break;
		case ia32_AddrModeS:
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			ia32_emit_am(node);
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			break;
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		case ia32_AddrModeD:
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		default:
			assert(0 && "unsupported op type");
	}
}

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/**
 * Emits registers and/or address mode of a unary operation.
 */
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void ia32_emit_unop(const ir_node *node, int pos)
{
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	const ir_node *op;

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	switch(get_ia32_op_type(node)) {
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	case ia32_Normal:
		op = get_irn_n(node, pos);
		if (is_ia32_Immediate(op)) {
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			emit_ia32_Immediate(op);
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		} else {
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			ia32_emit_source_register(node, pos);
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		}
		break;
	case ia32_AddrModeS:
	case ia32_AddrModeD:
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		ia32_emit_am(node);
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		break;
	default:
		assert(0 && "unsupported op type");
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	}
}

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static void ia32_emit_entity(ir_entity *entity, int no_pic_adjust)
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{
	ident *id;

	set_entity_backend_marked(entity, 1);
	id = get_entity_ld_ident(entity);
	be_emit_ident(id);

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	if (get_entity_owner(entity) == get_tls_type()) {
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		if (get_entity_visibility(entity) == visibility_external_allocated) {
			be_emit_cstring("@INDNTPOFF");
		} else {
			be_emit_cstring("@NTPOFF");
		}
	}
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	if (!no_pic_adjust && do_pic) {
		/* TODO: only do this when necessary */
		be_emit_char('-');
		be_emit_string(pic_base_label);
	}
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}

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/**
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 * Emits address mode.
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 */
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void ia32_emit_am(const ir_node *node)
{
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	ir_entity *ent       = get_ia32_am_sc(node);
	int        offs      = get_ia32_am_offs_int(node);
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	ir_node   *base      = get_irn_n(node, n_ia32_base);
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	int        has_base  = !is_ia32_NoReg_GP(base);
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	ir_node   *index     = get_irn_n(node, n_ia32_index);
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	int        has_index = !is_ia32_NoReg_GP(index);
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	/* just to be sure... */
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	assert(!is_ia32_use_frame(node) || get_ia32_frame_ent(node) != NULL);
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	/* emit offset */
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	if (ent != NULL) {
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		if (is_ia32_am_sc_sign(node))
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			be_emit_char('-');
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		ia32_emit_entity(ent, 0);
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	}

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	/* also handle special case if nothing is set */
	if (offs != 0 || (ent == NULL && !has_base && !has_index)) {
		if (ent != NULL) {
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			be_emit_irprintf("%+d", offs);
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		} else {
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			be_emit_irprintf("%d", offs);
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		}
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	}
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	if (has_base || has_index) {
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		be_emit_char('(');
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		/* emit base */
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		if (has_base) {
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			const arch_register_t *reg = get_in_reg(node, n_ia32_base);
			emit_register(reg, NULL);
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		}

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		/* emit index + scale */
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		if (has_index) {
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			const arch_register_t *reg = get_in_reg(node, n_ia32_index);
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			int scale;
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			be_emit_char(',');
			emit_register(reg, NULL);
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			scale = get_ia32_am_scale(node);
			if (scale > 0) {
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				be_emit_irprintf(",%d", 1 << scale);
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			}
		}
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		be_emit_char(')');
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	}
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}
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static void emit_ia32_IMul(const ir_node *node)
{
	ir_node               *left    = get_irn_n(node, n_ia32_IMul_left);
	const arch_register_t *out_reg = get_out_reg(node, pn_ia32_IMul_res);

	be_emit_cstring("\timul");
	ia32_emit_mode_suffix(node);
	be_emit_char(' ');

	ia32_emit_binop(node);

	/* do we need the 3-address form? */
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	if (is_ia32_NoReg_GP(left) ||
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			get_in_reg(node, n_ia32_IMul_left) != out_reg) {
		be_emit_cstring(", ");
		emit_register(out_reg, get_ia32_ls_mode(node));
	}
	be_emit_finish_line_gas(node);
}

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/*************************************************
 *                 _ _                         _
 *                (_) |                       | |
 *   ___ _ __ ___  _| |_    ___ ___  _ __   __| |
 *  / _ \ '_ ` _ \| | __|  / __/ _ \| '_ \ / _` |
 * |  __/ | | | | | | |_  | (_| (_) | | | | (_| |
 *  \___|_| |_| |_|_|\__|  \___\___/|_| |_|\__,_|
 *
 *************************************************/

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#undef IA32_DO_EMIT
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#define IA32_DO_EMIT(irn) ia32_fprintf_format(F, irn, cmd_buf, cmnt_buf)
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/*
 * coding of conditions
 */
struct cmp2conditon_t {
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	const char *name;
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	int         num;
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};

/*
 * positive conditions for signed compares
 */
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static const struct cmp2conditon_t cmp2condition_s[] = {
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	{ NULL,              pn_Cmp_False },  /* always false */
	{ "e",               pn_Cmp_Eq },     /* == */
	{ "l",               pn_Cmp_Lt },     /* < */
	{ "le",              pn_Cmp_Le },     /* <= */
	{ "g",               pn_Cmp_Gt },     /* > */
	{ "ge",              pn_Cmp_Ge },     /* >= */
	{ "ne",              pn_Cmp_Lg },     /* != */
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	{ NULL,              pn_Cmp_Leg},     /* always true */
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};

/*
 * positive conditions for unsigned compares
 */
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static const struct cmp2conditon_t cmp2condition_u[] = {
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	{ NULL,              pn_Cmp_False },  /* always false */
	{ "e",               pn_Cmp_Eq },     /* == */
	{ "b",               pn_Cmp_Lt },     /* < */
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	{ "be",              pn_Cmp_Le },     /* <= */
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	{ "a",               pn_Cmp_Gt },     /* > */
	{ "ae",              pn_Cmp_Ge },     /* >= */
	{ "ne",              pn_Cmp_Lg },     /* != */
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	{ NULL,              pn_Cmp_Leg },   /* always true  */
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};

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/**
 * walks up a tree of copies/perms/spills/reloads to find the original value
 * that is moved around
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 */
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static ir_node *find_original_value(ir_node *node)
{
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	if (irn_visited(node))
		return NULL;

	mark_irn_visited(node);
	if (be_is_Copy(node)) {
		return find_original_value(be_get_Copy_op(node));
	} else if (be_is_CopyKeep(node)) {
		return find_original_value(be_get_CopyKeep_op(node));
	} else if (is_Proj(node)) {
		ir_node *pred = get_Proj_pred(node);
		if (be_is_Perm(pred)) {
			return find_original_value(get_irn_n(pred, get_Proj_proj(node)));
		} else if (be_is_MemPerm(pred)) {
			return find_original_value(get_irn_n(pred, get_Proj_proj(node) + 1));
		} else if (is_ia32_Load(pred)) {
			return find_original_value(get_irn_n(pred, n_ia32_Load_mem));
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		} else {
			return node;
		}
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	} else if (is_ia32_Store(node)) {
		return find_original_value(get_irn_n(node, n_ia32_Store_val));
	} else if (is_Phi(node)) {
		int i, arity;
		arity = get_irn_arity(node);
		for (i = 0; i < arity; ++i) {
			ir_node *in  = get_irn_n(node, i);
			ir_node *res = find_original_value(in);

			if (res != NULL)
				return res;
		}
		return NULL;
	} else {
		return node;
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	}
}

static int determine_final_pnc(const ir_node *node, int flags_pos,
                               int pnc)
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{
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	ir_node           *flags = get_irn_n(node, flags_pos);
	const ia32_attr_t *flags_attr;
	flags = skip_Proj(flags);

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	if (is_ia32_Sahf(flags)) {
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		ir_node *cmp = get_irn_n(flags, n_ia32_Sahf_val);
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		if (!(is_ia32_FucomFnstsw(cmp) || is_ia32_FucompFnstsw(cmp)
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				|| is_ia32_FucomppFnstsw(cmp) || is_ia32_FtstFnstsw(cmp))) {
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			inc_irg_visited(current_ir_graph);
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			cmp = find_original_value(cmp);
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			assert(cmp != NULL);
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			assert(is_ia32_FucomFnstsw(cmp) || is_ia32_FucompFnstsw(cmp)
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			       || is_ia32_FucomppFnstsw(cmp) || is_ia32_FtstFnstsw(cmp));
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		}
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		flags_attr = get_ia32_attr_const(cmp);
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		if (flags_attr->data.ins_permuted)
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			pnc = get_mirrored_pnc(pnc);
		pnc |= ia32_pn_Cmp_float;
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	} else if (is_ia32_Ucomi(flags) || is_ia32_Fucomi(flags)
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			|| is_ia32_Fucompi(flags)) {
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		flags_attr = get_ia32_attr_const(flags);

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		if (flags_attr->data.ins_permuted)
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			pnc = get_mirrored_pnc(pnc);
		pnc |= ia32_pn_Cmp_float;
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	} else {
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		flags_attr = get_ia32_attr_const(flags);

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		if (flags_attr->data.ins_permuted)
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			pnc = get_mirrored_pnc(pnc);
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		if (flags_attr->data.cmp_unsigned)
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			pnc |= ia32_pn_Cmp_unsigned;
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	}
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	return pnc;
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}

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static void ia32_emit_cmp_suffix(int pnc)
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{
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	const char        *str;

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	if ((pnc & ia32_pn_Cmp_float) || (pnc & ia32_pn_Cmp_unsigned)) {
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		pnc = pnc & 7;
		assert(cmp2condition_u[pnc].num == pnc);
		str = cmp2condition_u[pnc].name;
	} else {
		pnc = pnc & 7;
		assert(cmp2condition_s[pnc].num == pnc);
		str = cmp2condition_s[pnc].name;
	}

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	be_emit_string(str);
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}

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void ia32_emit_cmp_suffix_node(const ir_node *node,
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                               int flags_pos)
{
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	const ia32_attr_t *attr = get_ia32_attr_const(node);

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	pn_Cmp pnc = get_ia32_condcode(node);
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	pnc = determine_final_pnc(node, flags_pos, pnc);
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	if (attr->data.ins_permuted) {
		if (pnc & ia32_pn_Cmp_float) {
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			pnc = get_negated_pnc(pnc, mode_F);
		} else {
			pnc = get_negated_pnc(pnc, mode_Iu);
		}
	}

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	ia32_emit_cmp_suffix(pnc);
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}
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/**
 * Returns the target block for a control flow node.
 */
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static ir_node *get_cfop_target_block(const ir_node *irn)
{
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	assert(get_irn_mode(irn) == mode_X);
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	return get_irn_link(irn);
}

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/**
 * Emits a block label for the given block.
 */
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static void ia32_emit_block_name(const ir_node *block)
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{
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	if (has_Block_label(block)) {
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		be_emit_string(be_gas_block_label_prefix());
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		be_emit_irprintf("%lu", get_Block_label(block));
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	} else {
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		be_emit_cstring(BLOCK_PREFIX);
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		be_emit_irprintf("%ld", get_irn_node_nr(block));
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	}
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}

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/**
 * Emits an exception label for a given node.
 */
static void ia32_emit_exc_label(const ir_node *node)
{
	be_emit_string(be_gas_insn_label_prefix());
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	be_emit_irprintf("%lu", get_ia32_exc_label_id(node));
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}

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/**
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 * Emits the target label for a control flow node.
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 */
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static void ia32_emit_cfop_target(const ir_node *node)
{
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	ir_node *block = get_cfop_target_block(node);
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	ia32_emit_block_name(block);
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}
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/**
 * Returns the Proj with projection number proj and NOT mode_M
 */
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static ir_node *get_proj(const ir_node *node, long proj)
{
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	const ir_edge_t *edge;
	ir_node         *src;

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	assert(get_irn_mode(node) == mode_T && "expected mode_T node");
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	foreach_out_edge(node, edge) {
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		src = get_edge_src_irn(edge);

		assert(is_Proj(src) && "Proj expected");
		if (get_irn_mode(src) == mode_M)
			continue;

		if (get_Proj_proj(src) == proj)
			return src;
	}
	return NULL;
}

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static int can_be_fallthrough(const ir_node *node)
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{
	ir_node *target_block = get_cfop_target_block(node);
	ir_node *block        = get_nodes_block(node);
	return get_prev_block_sched(target_block) == block;
}

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/**
 * Emits the jump sequence for a conditional jump (cmp + jmp_true + jmp_false)
 */
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static void emit_ia32_Jcc(const ir_node *node)
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{
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	int            need_parity_label = 0;
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	const ir_node *proj_true;
	const ir_node *proj_false;
	const ir_node *block;
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	pn_Cmp         pnc = get_ia32_condcode(node);
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	pnc = determine_final_pnc(node, 0, pnc);
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	/* get both Projs */
	proj_true = get_proj(node, pn_ia32_Jcc_true);
	assert(proj_true && "Jcc without true Proj");
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	proj_false = get_proj(node, pn_ia32_Jcc_false);
	assert(proj_false && "Jcc without false Proj");
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	block      = get_nodes_block(node);
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	if (can_be_fallthrough(proj_true)) {
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		/* exchange both proj's so the second one can be omitted */
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		const ir_node *t = proj_true;

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		proj_true  = proj_false;
		proj_false = t;
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		if (pnc & ia32_pn_Cmp_float) {
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			pnc = get_negated_pnc(pnc, mode_F);
		} else {
			pnc = get_negated_pnc(pnc, mode_Iu);
		}
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	}

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	if (pnc & ia32_pn_Cmp_float) {
		/* Some floating point comparisons require a test of the parity flag,
		 * which indicates that the result is unordered */
		switch (pnc & 15) {
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			case pn_Cmp_Uo: {
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				be_emit_cstring("\tjp ");
				ia32_emit_cfop_target(proj_true);
				be_emit_finish_line_gas(proj_true);
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				break;
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			}
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			case pn_Cmp_Leg:
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				be_emit_cstring("\tjnp ");
				ia32_emit_cfop_target(proj_true);
				be_emit_finish_line_gas(proj_true);
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				break;

			case pn_Cmp_Eq:
			case pn_Cmp_Lt:
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			case pn_Cmp_Le:
				/* we need a local label if the false proj is a fallthrough
				 * as the falseblock might have no label emitted then */
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				if (can_be_fallthrough(proj_false)) {
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					need_parity_label = 1;
					be_emit_cstring("\tjp 1f");
				} else {
					be_emit_cstring("\tjp ");
					ia32_emit_cfop_target(proj_false);
				}
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				be_emit_finish_line_gas(proj_false);
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				goto emit_jcc;
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			case pn_Cmp_Ug:
			case pn_Cmp_Uge:
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			case pn_Cmp_Ne:
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				be_emit_cstring("\tjp ");
				ia32_emit_cfop_target(proj_true);
				be_emit_finish_line_gas(proj_true);
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				goto emit_jcc;
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			default:
				goto emit_jcc;
		}
	} else {
emit_jcc:
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		be_emit_cstring("\tj");
		ia32_emit_cmp_suffix(pnc);
		be_emit_char(' ');
		ia32_emit_cfop_target(proj_true);
		be_emit_finish_line_gas(proj_true);
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	}

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	if (need_parity_label) {
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		be_emit_cstring("1:");
		be_emit_write_line();
	}

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	/* the second Proj might be a fallthrough */
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	if (can_be_fallthrough(proj_false)) {
		be_emit_cstring("\t/* fallthrough to ");
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		ia32_emit_cfop_target(proj_false);
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		be_emit_cstring(" */");
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		be_emit_finish_line_gas(proj_false);
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	} else {