sparc_emitter.c 42.6 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   emit assembler for a backend graph
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 * @author  Hannes Rapp, Matthias Braun
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 */
#include <limits.h>
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#include <inttypes.h>
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#include "util.h"
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#include "beutil.h"
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#include "bitfiddle.h"
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#include "xmalloc.h"
#include "tv.h"
#include "iredges.h"
#include "debug.h"
#include "irgwalk.h"
#include "irop_t.h"
#include "irargs_t.h"
#include "irprog.h"
#include "irargs_t.h"
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#include "panic.h"
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#include "raw_bitset.h"
#include "dbginfo.h"
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#include "heights.h"
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#include "pmap.h"
#include "execfreq_t.h"
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#include "besched.h"
#include "beblocksched.h"
#include "beirg.h"
#include "begnuas.h"
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#include "bedwarf.h"
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#include "benode.h"
#include "bestack.h"
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#include "bepeephole.h"
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#include "sparc_emitter.h"
#include "gen_sparc_emitter.h"
#include "sparc_nodes_attr.h"
#include "sparc_new_nodes.h"
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#include "gen_sparc_regalloc_if.h"

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DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)

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static ir_heights_t *heights;
static unsigned     *delay_slot_fillers;
static pmap         *delay_slots;
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static bool emitting_delay_slot;

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/**
 * indent before instruction. (Adds additional indentation when emitting
 * delay slots)
 */
static void sparc_emit_indent(void)
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{
	be_emit_char('\t');
	if (emitting_delay_slot)
		be_emit_char(' ');
}
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static void sparc_emit_immediate(int32_t value, ir_entity *entity)
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{
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	if (entity == NULL) {
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		assert(sparc_is_value_imm_encodeable(value));
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		be_emit_irprintf("%"PRId32, value);
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	} else {
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		if (is_tls_entity(entity)) {
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			be_emit_cstring("%tle_lox10(");
		} else {
			be_emit_cstring("%lo(");
		}
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		be_gas_emit_entity(entity);
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		if (value != 0) {
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			be_emit_irprintf("%+"PRId32, value);
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		}
		be_emit_char(')');
	}
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}

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static void sparc_emit_high_immediate(ir_node const *node)
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{
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	const sparc_attr_t *attr   = get_sparc_attr_const(node);
	ir_entity          *entity = attr->immediate_value_entity;

	if (entity == NULL) {
		uint32_t value = (uint32_t) attr->immediate_value;
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		be_emit_irprintf("%%hi(0x%X)", value);
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	} else {
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		if (is_tls_entity(entity)) {
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			be_emit_cstring("%tle_hix22(");
		} else {
			be_emit_cstring("%hi(");
		}
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		be_gas_emit_entity(entity);
		if (attr->immediate_value != 0) {
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			be_emit_irprintf("%+"PRId32, attr->immediate_value);
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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 sparc_emit_register(const arch_register_t *const reg)
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{
	be_emit_char('%');
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	be_emit_string(reg->name);
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}

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static void sparc_emit_source_register(ir_node const *node, int const pos)
{
	const arch_register_t *reg = arch_get_irn_register_in(node, pos);
	sparc_emit_register(reg);
}

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static void sparc_emit_dest_register(ir_node const *const node, int const pos)
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{
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	const arch_register_t *reg = arch_get_irn_register_out(node, pos);
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	sparc_emit_register(reg);
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}

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/**
 * emit SP offset
 */
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static void sparc_emit_offset(const ir_node *node, int offset_node_pos)
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{
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	const sparc_load_store_attr_t *attr = get_sparc_load_store_attr_const(node);
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	if (attr->is_reg_reg) {
		assert(!attr->is_frame_entity);
		assert(attr->base.immediate_value == 0);
		assert(attr->base.immediate_value_entity == NULL);
		be_emit_char('+');
		sparc_emit_source_register(node, offset_node_pos);
	} else if (attr->is_frame_entity) {
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		int32_t offset = attr->base.immediate_value;
		if (offset != 0) {
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			assert(sparc_is_value_imm_encodeable(offset));
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			be_emit_irprintf("%+"PRId32, offset);
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		}
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	} else if (attr->base.immediate_value != 0
			|| attr->base.immediate_value_entity != NULL) {
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		be_emit_char('+');
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		sparc_emit_immediate(attr->base.immediate_value,
		                     attr->base.immediate_value_entity);
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	}
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}

/**
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 *  Emit load mode
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 */
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static void sparc_emit_load_mode(ir_node const *const node)
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{
	const sparc_load_store_attr_t *attr = get_sparc_load_store_attr_const(node);
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	ir_mode *mode      = attr->load_store_mode;
	int      bits      = get_mode_size_bits(mode);
	bool     is_signed = mode_is_signed(mode);

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	switch (bits) {
	case   8: be_emit_string(is_signed ? "sb" : "ub"); break;
	case  16: be_emit_string(is_signed ? "sh" : "uh"); break;
	case  32: break;
	case  64: be_emit_char('d'); break;
	case 128: be_emit_char('q'); break;
	default:  panic("invalid load/store mode %+F", mode);
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	}
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}

/**
 * Emit store mode char
 */
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static void sparc_emit_store_mode(ir_node const *const node)
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{
	const sparc_load_store_attr_t *attr = get_sparc_load_store_attr_const(node);
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	ir_mode *mode      = attr->load_store_mode;
	int      bits      = get_mode_size_bits(mode);

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	switch (bits) {
	case   8: be_emit_char('b'); break;
	case  16: be_emit_char('h'); break;
	case  32: break;
	case  64: be_emit_char('d'); break;
	case 128: be_emit_char('q'); break;
	default:  panic("invalid load/store mode %+F", mode);
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	}
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}

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static void emit_fp_suffix(const ir_mode *mode)
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{
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	assert(mode_is_float(mode));
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	switch (get_mode_size_bits(mode)) {
	case  32: be_emit_char('s'); break;
	case  64: be_emit_char('d'); break;
	case 128: be_emit_char('q'); break;
	default:  panic("invalid FP mode");
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	}
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}

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static void set_jump_target(ir_node *jump, ir_node *target)
{
	set_irn_link(jump, target);
}

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static ir_node *get_jump_target(const ir_node *jump)
{
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	return (ir_node*)get_irn_link(jump);
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}

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/**
 * Returns the target label for a control flow node.
 */
static void sparc_emit_cfop_target(const ir_node *node)
{
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	ir_node *block = get_jump_target(node);
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	be_gas_emit_block_name(block);
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}

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/**
 * returns true if a sparc_call calls a register and not an immediate
 */
static bool is_sparc_reg_call(const ir_node *node)
{
	const sparc_attr_t *attr = get_sparc_attr_const(node);
	return attr->immediate_value_entity == NULL;
}

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static int get_sparc_Call_dest_addr_pos(const ir_node *node)
{
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	assert(is_sparc_reg_call(node));
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	return get_irn_arity(node)-1;
}

static bool ba_is_fallthrough(const ir_node *node)
{
	ir_node *block      = get_nodes_block(node);
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	ir_node *next_block = (ir_node*)get_irn_link(block);
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	return get_jump_target(node) == next_block;
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}

static bool is_no_instruction(const ir_node *node)
{
	/* copies are nops if src_reg == dest_reg */
	if (be_is_Copy(node) || be_is_CopyKeep(node)) {
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		const arch_register_t *src_reg  = arch_get_irn_register_in(node, 0);
		const arch_register_t *dest_reg = arch_get_irn_register_out(node, 0);
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		if (src_reg == dest_reg)
			return true;
	}
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	if (be_is_IncSP(node) && be_get_IncSP_offset(node) == 0)
		return true;
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	/* Ba is not emitted if it is a simple fallthrough */
	if (is_sparc_Ba(node) && ba_is_fallthrough(node))
		return true;

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	return be_is_Keep(node) || is_sparc_Start(node) || is_Phi(node);
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}

static bool has_delay_slot(const ir_node *node)
{
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	if (is_sparc_Ba(node)) {
		return !ba_is_fallthrough(node);
	}
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	return arch_get_irn_flags(node) & sparc_arch_irn_flag_has_delay_slot;
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}

/** returns true if the emitter for this sparc node can produce more than one
 * actual sparc instruction.
 * Usually it is a bad sign if we have to add instructions here. We should
 * rather try to get them lowered down. So we can actually put them into
 * delay slots and make them more accessible to the scheduler.
 */
static bool emits_multiple_instructions(const ir_node *node)
{
	if (has_delay_slot(node))
		return true;

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	if (is_sparc_Call(node))
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		return arch_get_irn_flags(node) & sparc_arch_irn_flag_aggregate_return;
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	return is_sparc_SMulh(node) || is_sparc_UMulh(node)
		|| is_sparc_SDiv(node) || is_sparc_UDiv(node)
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		|| be_is_MemPerm(node) || be_is_Perm(node)
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		|| is_sparc_SubSP(node) || is_sparc_ASM(node);
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}

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static bool uses_reg(const ir_node *node, unsigned reg_index, unsigned width)
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{
	int arity = get_irn_arity(node);
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	for (int i = 0; i < arity; ++i) {
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		const arch_register_t     *in_reg = arch_get_irn_register_in(node, i);
		const arch_register_req_t *in_req = arch_get_irn_register_req_in(node, i);
		if (in_reg == NULL)
			continue;
		if (reg_index < (unsigned)in_reg->global_index + in_req->width
			&& reg_index + width > in_reg->global_index)
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			return true;
	}
	return false;
}

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static bool writes_reg(const ir_node *node, unsigned reg_index, unsigned width)
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{
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	be_foreach_out(node, o) {
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		const arch_register_t *out_reg = arch_get_irn_register_out(node, o);
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		if (out_reg == NULL)
			continue;
		const arch_register_req_t *out_req = arch_get_irn_register_req_out(node, o);
		if (reg_index < (unsigned)out_reg->global_index + out_req->width
			&& reg_index + width > out_reg->global_index)
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			return true;
	}
	return false;
}

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static bool is_legal_delay_slot_filler(const ir_node *node)
{
	if (is_no_instruction(node))
		return false;
	if (emits_multiple_instructions(node))
		return false;
	if (rbitset_is_set(delay_slot_fillers, get_irn_idx(node)))
		return false;
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	if (is_sparc_Save(node))
		return false;
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	return true;
}

static bool can_move_down_into_delayslot(const ir_node *node, const ir_node *to)
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{
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	if (!is_legal_delay_slot_filler(node))
		return false;

	if (!be_can_move_down(heights, node, to))
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		return false;

	if (is_sparc_Call(to)) {
		ir_node *check;
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		/** all inputs are used after the delay slot so, we're fine */
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		if (!is_sparc_reg_call(to))
			return true;

		check = get_irn_n(to, get_sparc_Call_dest_addr_pos(to));
		if (skip_Proj(check) == node)
			return false;
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		/* the Call also destroys the value of %o7, but since this is
		 * currently marked as ignore register in the backend, it
		 * should never be used by the instruction in the delay slot. */
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		if (uses_reg(node, REG_O7, 1))
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			return false;
		return true;
	} else if (is_sparc_Return(to)) {
		/* return uses the value of %o7, all other values are not
		 * immediately used */
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		if (writes_reg(node, REG_O7, 1))
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			return false;
		return true;
	} else {
		/* the node must not use our computed values */
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		foreach_irn_in(to, i, in) {
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			if (skip_Proj(in) == node)
				return false;
		}
		return true;
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	}
}

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static bool can_move_up_into_delayslot(const ir_node *node, const ir_node *to)
{
	if (!be_can_move_up(heights, node, to))
		return false;

	/* node must not use any results of 'to' */
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	foreach_irn_in(node, i, in) {
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		ir_node *skipped = skip_Proj(in);
		if (skipped == to)
			return false;
	}

	/* register window cycling effects at Restore aren't correctly represented
	 * in the graph yet so we need this exception here */
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	if (is_sparc_Restore(node) || is_sparc_RestoreZero(node)) {
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		return false;
	} else if (is_sparc_Call(to)) {
		/* node must not overwrite any of the inputs of the call,
		 * (except for the dest_addr) */
		int dest_addr_pos = is_sparc_reg_call(to)
			? get_sparc_Call_dest_addr_pos(to) : -1;

		int call_arity = get_irn_arity(to);
		for (int i = 0; i < call_arity; ++i) {
			if (i == dest_addr_pos)
				continue;
			const arch_register_t *reg = arch_get_irn_register_in(to, i);
			if (reg == NULL)
				continue;
			const arch_register_req_t *req = arch_get_irn_register_req_in(to, i);
			if (writes_reg(node, reg->global_index, req->width))
				return false;
		}

		/* node must not write to one of the call outputs */
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		be_foreach_out(to, o) {
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			const arch_register_t *reg = arch_get_irn_register_out(to, o);
			if (reg == NULL)
				continue;
			const arch_register_req_t *req = arch_get_irn_register_req_out(to, o);
			if (writes_reg(node, reg->global_index, req->width))
				return false;
		}
	} else if (is_sparc_SDiv(to) || is_sparc_UDiv(to)) {
		/* node will be inserted between wr and div so it must not overwrite
		 * anything except the wr input */
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		for (int i = 0, arity = get_irn_arity(to); i < arity; ++i) {
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			assert((unsigned)n_sparc_SDiv_dividend_high == (unsigned)n_sparc_UDiv_dividend_high);
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			if (i == n_sparc_SDiv_dividend_high)
				continue;
			const arch_register_t *reg = arch_get_irn_register_in(to, i);
			if (reg == NULL)
				continue;
			const arch_register_req_t *req = arch_get_irn_register_req_in(to, i);
			if (writes_reg(node, reg->global_index, req->width))
				return false;
		}
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	}
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	return true;
}

static void optimize_fallthrough(ir_node *node)
{
	ir_node *proj_true  = NULL;
	ir_node *proj_false = NULL;

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	assert((unsigned)pn_sparc_Bicc_false == (unsigned)pn_sparc_fbfcc_false);
	assert((unsigned)pn_sparc_Bicc_true  == (unsigned)pn_sparc_fbfcc_true);
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	foreach_out_edge(node, edge) {
		ir_node *proj = get_edge_src_irn(edge);
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		unsigned pn   = get_Proj_num(proj);
		if (pn == pn_sparc_Bicc_true) {
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			proj_true = proj;
		} else {
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			assert(pn == pn_sparc_Bicc_false);
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			proj_false = proj;
		}
	}
	assert(proj_true != NULL && proj_false != NULL);

	/* for now, the code works for scheduled and non-schedules blocks */
	const ir_node *block = get_nodes_block(node);

	/* we have a block schedule */
	const ir_node *next_block = (ir_node*)get_irn_link(block);

	if (get_jump_target(proj_true) == next_block) {
		/* exchange both proj destinations so the second one can be omitted */
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		set_Proj_num(proj_true,  pn_sparc_Bicc_false);
		set_Proj_num(proj_false, pn_sparc_Bicc_true);
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		sparc_jmp_cond_attr_t *attr = get_sparc_jmp_cond_attr(node);
		attr->relation = get_negated_relation(attr->relation);
	}
}

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/**
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 * search for an instruction that can fill the delay slot of @p node
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 */
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static ir_node *pick_delay_slot_for(ir_node *node)
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{
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	static const unsigned PICK_DELAY_SLOT_MAX_DISTANCE = 10;
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	assert(has_delay_slot(node));

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	if (is_sparc_Bicc(node) || is_sparc_fbfcc(node)) {
		optimize_fallthrough(node);
	}
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	unsigned tries = 0;
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	sched_foreach_reverse_before(node, schedpoint) {
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		if (has_delay_slot(schedpoint))
			break;
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		if (tries++ >= PICK_DELAY_SLOT_MAX_DISTANCE)
			break;
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		if (!can_move_down_into_delayslot(schedpoint, node))
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			continue;

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		/* found something */
		return schedpoint;
	}

	/* search after the current position */
	tries = 0;
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	sched_foreach_after(node, schedpoint) {
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		if (has_delay_slot(schedpoint))
			break;
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		if (tries++ >= PICK_DELAY_SLOT_MAX_DISTANCE)
			break;
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		if (!is_legal_delay_slot_filler(schedpoint))
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			continue;
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		if (!can_move_up_into_delayslot(schedpoint, node))
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			continue;

		/* found something */
		return schedpoint;
	}

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	/* look in successor blocks */
	ir_node *block = get_nodes_block(node);
	/* TODO: sort succs by execution frequency */
	foreach_block_succ(block, edge) {
		ir_node *succ = get_edge_src_irn(edge);
		/* we can't easily move up stuff from blocks with multiple predecessors
		 * since the instruction is lacking for the other preds then.
		 * (We also don't have to do any phi translation) */
		if (get_Block_n_cfgpreds(succ) > 1)
			continue;

		tries = 0;
		sched_foreach(succ, schedpoint) {
			if (has_delay_slot(schedpoint))
				break;
			/* can't move pinned nodes accross blocks */
			if (get_irn_pinned(schedpoint) == op_pin_state_pinned)
				continue;
			/* restore doesn't model register window switching correctly,
			 * so it appears like we could move it, which is not true */
			if (is_sparc_Restore(schedpoint)
			    || is_sparc_RestoreZero(schedpoint))
				continue;
			if (tries++ >= PICK_DELAY_SLOT_MAX_DISTANCE)
				break;
			if (!is_legal_delay_slot_filler(schedpoint))
				continue;
			if (can_move_up_into_delayslot(schedpoint, node)) {
				/* it's fine to move the insn accross blocks */
				return schedpoint;
			} else if (is_sparc_Bicc(node) || is_sparc_fbfcc(node)) {
				ir_node *proj = get_Block_cfgpred(succ, 0);
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				unsigned nr   = get_Proj_num(proj);
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				if ((nr == pn_sparc_Bicc_true || nr == pn_sparc_fbfcc_true)
					&& be_can_move_up(heights, schedpoint, succ)) {
					/* we can use it with the annul flag */
					sparc_jmp_cond_attr_t *attr = get_sparc_jmp_cond_attr(node);
					attr->annul_delay_slot = true;
					return schedpoint;
				}
			}
		}
	}

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	return NULL;
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}

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void sparc_emitf(ir_node const *const node, char const *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	sparc_emit_indent();
	for (;;) {
		char const *start = fmt;

		while (*fmt != '%' && *fmt != '\0')
			++fmt;
		be_emit_string_len(start, fmt - start);
		if (*fmt == '\0')
			break;
		++fmt;

		bool plus = false;
		if (*fmt == '+') {
			plus = true;
			++fmt;
		}

		switch (*fmt++) {
		case '%':
			be_emit_char('%');
			break;

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		case 'A': {
			const sparc_jmp_cond_attr_t *attr
				= get_sparc_jmp_cond_attr_const(node);
			if (attr->annul_delay_slot) {
				be_emit_cstring(",a");
			}
			break;
		}

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		case 'D':
			if (*fmt < '0' || '9' <= *fmt)
				goto unknown;
			sparc_emit_dest_register(node, *fmt++ - '0');
			break;

		case 'E': {
			sparc_attr_t const *const attr = get_sparc_attr_const(node);
			be_gas_emit_entity(attr->immediate_value_entity);
			if (attr->immediate_value != 0) {
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				be_emit_irprintf(plus ? "%+"PRId32 : "%"PRId32, attr->immediate_value);
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			}
			break;
		}

		case 'F': {
			ir_mode *mode;
			switch (*fmt++) {
			case 'D': mode = get_sparc_fp_conv_attr_const(node)->dest_mode; break;
			case 'M': mode = get_sparc_fp_attr_const(node)->fp_mode;        break;
			case 'S': mode = get_sparc_fp_conv_attr_const(node)->src_mode;  break;
			default:  goto unknown;
			}
			emit_fp_suffix(mode);
			break;
		}

		case 'H':
			sparc_emit_high_immediate(node);
			break;

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		case 'L': {
			ir_node *n = va_arg(ap, ir_node*);
			sparc_emit_cfop_target(n);
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			break;
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		}
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		case 'M':
			switch (*fmt++) {
			case 'L': sparc_emit_load_mode(node);  break;
			case 'S': sparc_emit_store_mode(node); break;
			default:  goto unknown;
			}
			break;

		case 'O':
			if (*fmt < '0' || '9' <= *fmt)
				goto unknown;
			sparc_emit_offset(node, *fmt++ - '0');
			break;

		case 'R': {
			arch_register_t const *const reg = va_arg(ap, const arch_register_t*);
			be_emit_char('%');
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			be_emit_string(reg->name);
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			break;
		}

		case 'S': {
			bool imm = false;
			if (*fmt == 'I') {
				imm = true;
				++fmt;
			}
			if (*fmt < '0' || '9' <= *fmt)
				goto unknown;
			unsigned const pos = *fmt++ - '0';
			if (imm && arch_get_irn_flags(node) & (arch_irn_flags_t)sparc_arch_irn_flag_immediate_form) {
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				const sparc_attr_t *const attr = get_sparc_attr_const(node);
				sparc_emit_immediate(attr->immediate_value,
				                     attr->immediate_value_entity);
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			} else {
				sparc_emit_source_register(node, pos);
			}
			break;
		}

		case 'd': {
			int const num = va_arg(ap, int);
			be_emit_irprintf(plus ? "%+d" : "%d", num);
			break;
		}

		case 's': {
			char const *const str = va_arg(ap, char const*);
			be_emit_string(str);
			break;
		}

		case 'u': {
			unsigned const num = va_arg(ap, unsigned);
			be_emit_irprintf(plus ? "%+u" : "%u", num);
			break;
		}

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		case 'X': {
			unsigned const num = va_arg(ap, unsigned);
			be_emit_irprintf("%X", num);
			break;
		}

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		default:
unknown:
			panic("unknown format conversion in sparc_emitf()");
		}
	}
	be_emit_finish_line_gas(node);
	va_end(ap);
}

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/**
 * Emits code for stack space management
 */
static void emit_be_IncSP(const ir_node *irn)
{
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	int offset = be_get_IncSP_offset(irn);
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	if (offset == 0)
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		return;
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	/* SPARC stack grows downwards */
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	char const *const insn = offset > 0 ? offset = -offset, "add" : "sub";
	sparc_emitf(irn, "%s %S0, %d, %D0", insn, offset);
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}
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static const char *emit_asm_operand(const ir_node *node, const char *s)
{
	assert(*s == '%');
	char c = *(++s);
	/* parse modifiers */
	if (c == '\0') {
		ir_fprintf(stderr, "Warning: asm text (%+F) ends with %%\n", node);
		be_emit_char('%');
		return s;
	} else if (c == '%') {
		be_emit_char('%');
		return s+1;
	} else if (c < '0' || c > '9') {
		ir_fprintf(stderr, "Warning: asm text (%+F) contains unknown modifier '%c' for asm op\n",
		           node, c);
		return s+1;
	}

	/* parse number */
	int num = 0;
	int p   = 0;
	sscanf(s, "%d%n", &num, &p);
	s += p;

	const sparc_asm_attr_t     *const attr     = get_sparc_asm_attr_const(node);
	const sparc_asm_operand_t  *const operands = attr->operands;
	if ((size_t)num > ARR_LEN(operands)) {
		ir_fprintf(stderr,
		           "Error: Custom assembler references invalid input/output (%+F)\n",
		           node);
		return s;
	}

	const sparc_asm_operand_t *const operand = &operands[num];
	const arch_register_t *reg = NULL;
	switch (operand->kind) {
	case ASM_OPERAND_IMMEDIATE:
		sparc_emit_immediate(operand->immediate_value,
		                     operand->immediate_value_entity);
		return s;
	case ASM_OPERAND_INPUT_VALUE:
		reg = arch_get_irn_register_in(node, operand->pos);
		break;
	case ASM_OPERAND_OUTPUT_VALUE:
		reg = arch_get_irn_register_out(node, operand->pos);
		break;
	}

	/* emit the register */
	sparc_emit_register(reg);
	return s;
}

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static void emit_sparc_ASM(const ir_node *node)
{
	be_emit_cstring("#APP\n");
	be_emit_write_line();

	const sparc_asm_attr_t *attr = get_sparc_asm_attr_const(node);
	const char             *s    = get_id_str(attr->text);

	if (s[0] != '\t')
		be_emit_char('\t');
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	while (*s != 0) {
		if (*s == '%') {
			s = emit_asm_operand(node, s);
		} else {
			be_emit_char(*s++);
		}
	}
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	be_emit_cstring("\n#NO_APP\n");
	be_emit_write_line();

}

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/**
 * Emits code for stack space management.
 */
static void emit_sparc_SubSP(const ir_node *irn)
{
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	sparc_emitf(irn, "sub %S0, %SI1, %D0");
	sparc_emitf(irn, "add %S0, %u, %D1", SPARC_MIN_STACKSIZE);
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}
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static void fill_delay_slot(const ir_node *node)
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{
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	emitting_delay_slot = true;
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	const ir_node *filler = pmap_get(ir_node, delay_slots, node);
	if (filler != NULL) {
		assert(!is_no_instruction(filler));
		assert(!emits_multiple_instructions(filler));
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		be_emit_node(filler);
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	} else {
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		sparc_emitf(NULL, "nop");
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	}
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	emitting_delay_slot = false;
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}

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static void emit_sparc_Div(const ir_node *node, char const *const insn)
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{
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	sparc_emitf(node, "wr %S1, 0, %%y");
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	/* TODO: we should specify number of delayslots in an architecture
	 * specification */
	unsigned wry_delay_count = 3;
	for (unsigned i = 0; i < wry_delay_count; ++i) {
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		if (i == 0) {
			fill_delay_slot(node);
		} else {
			emitting_delay_slot = true;
			sparc_emitf(NULL, "nop");
			emitting_delay_slot = false;
		}
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	}

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	sparc_emitf(node, "%s %S2, %SI3, %D0", insn);
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}

static void emit_sparc_SDiv(const ir_node *node)
{
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	emit_sparc_Div(node, "sdiv");
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}

static void emit_sparc_UDiv(const ir_node *node)
{
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	emit_sparc_Div(node, "udiv");
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}

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static void emit_sparc_Call(const ir_node *node)
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{
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	if (is_sparc_reg_call(node)) {
		int dest_addr = get_sparc_Call_dest_addr_pos(node);
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		sparc_emitf(node, "call %R", arch_get_irn_register_in(node, dest_addr));
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	} else {
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		sparc_emitf(node, "call %E, 0");
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	}
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	fill_delay_slot(node);
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	if (arch_get_irn_flags(node) & sparc_arch_irn_flag_aggregate_return) {
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		sparc_emitf(NULL, "unimp 8");
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	}
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}

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static void emit_sparc_Cas(const ir_node *node)
{
	/* custom emiter is just here to check for should_be_same constraint
	 * which isn't guaranteed to be fulfilled in current firm backend */
	if (arch_get_irn_register_out(node, pn_sparc_Cas_res) !=
	    arch_get_irn_register_in(node, n_sparc_Cas_new)) {
	    panic("sparc: should_be_same in Cas not fulfilled");
	}
	/* except for some patched gaisler binutils nobody understands cas
	 * in v8/leon mode, so we encode the cas in binary form */
#if 0
	sparc_emitf(node, "cas [%S0], %S1, %S2");
#else
	const arch_register_t *reg_new
		= arch_get_irn_register_in(node, n_sparc_Cas_new);
	const arch_register_t *reg_ptr
		= arch_get_irn_register_in(node, n_sparc_Cas_ptr);
	const arch_register_t *reg_old
		= arch_get_irn_register_in(node, n_sparc_Cas_old);
	uint32_t encoding = 3u<<30 | (reg_new->encoding<<25) | (0x3C << 19)
	       | (reg_ptr->encoding<<14) | (0x80<<5) | (reg_old->encoding);
	sparc_emitf(node, ".long 0x%X  /* cas [%S0], %S1, %S2", encoding);
#endif
}

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static void emit_be_Perm(const ir_node *irn)
{
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	ir_mode *mode = get_irn_mode(get_irn_n(irn, 0));
	if (mode_is_float(mode)) {
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		arch_register_t const *const reg0 = arch_get_irn_register_out(irn, 0);
		arch_register_t const *const reg1 = arch_get_irn_register_out(irn, 1);
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		unsigned reg_idx0 = reg0->global_index;
		unsigned reg_idx1 = reg1->global_index;
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		unsigned width    = arch_get_irn_register_req_out(irn, 0)->width;
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		for (unsigned i = 0; i < width; ++i) {
			const arch_register_t *r0 = &sparc_registers[reg_idx0+i];
			const arch_register_t *r1 = &sparc_registers[reg_idx1+i];
			sparc_emitf(irn, "fmovs %R, %%f31", r0);
			sparc_emitf(irn, "fmovs %R, %R", r1, r0);
			sparc_emitf(irn, "fmovs %%f31, %R", r1);
		}
	} else {
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		sparc_emitf(irn, "xor %D1, %D0, %D0");
		sparc_emitf(irn, "xor %D1, %D0, %D1");
		sparc_emitf(irn, "xor %D1, %D0, %D0");
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	}
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}

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static unsigned get_aligned_sp_change(const unsigned num_regs)
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{
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	const unsigned bytes = num_regs * SPARC_REGISTER_SIZE;
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	return round_up2(bytes, SPARC_STACK_ALIGNMENT);
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}

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/* Spill register l0 or both l0 and l1, depending on n_spilled and n_to_spill.*/
static void memperm_emit_spill_registers(const ir_node *node, int n_spilled,
                                         int n_to_spill)
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{
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	assert(n_spilled < n_to_spill);
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	if (n_spilled == 0) {
		/* We always reserve stack space for two registers because during copy
		 * processing we don't know yet if we also need to handle a cycle which
		 * needs two registers.  More complicated code in emit_MemPerm would
		 * prevent wasting SPARC_REGISTER_SIZE bytes of stack space but
		 * it is not worth the worse readability of emit_MemPerm. */
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		const unsigned sp_change = get_aligned_sp_change(2);
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		sparc_emitf(node, "sub %%sp, %u, %%sp", sp_change);
		sparc_emitf(node, "st %%l0, [%%sp%+d]", SPARC_MIN_STACKSIZE);
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	}
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	if (n_to_spill == 2) {
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		sparc_emitf(node, "st %%l1, [%%sp%+d]", SPARC_MIN_STACKSIZE + SPARC_REGISTER_SIZE);
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	}
}
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/* Restore register l0 or both l0 and l1, depending on n_spilled. */
static void memperm_emit_restore_registers(const ir_node *node, int n_spilled)
{
	if (n_spilled == 2) {
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		sparc_emitf(node, "ld [%%sp%+d], %%l1", SPARC_MIN_STACKSIZE + SPARC_REGISTER_SIZE);
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	}
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	sparc_emitf(node, "ld [%%sp%+d], %%l0", SPARC_MIN_STACKSIZE);
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	const unsigned sp_change = get_aligned_sp_change(2);
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	sparc_emitf(node, "add %%sp, %u, %%sp", sp_change);
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}

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static int get_real_entity_offset(const ir_node *node, ir_entity *ent)
{
	ir_graph          *irg     = get_irn_irg(node);
	be_stack_layout_t *layout  = be_get_irg_stack_layout(irg);
	const int          off_ent = be_get_stack_entity_offset(layout, ent, 0);

	if (layout->sp_relative) {
		ir_entity *ent_ref   = be_get_MemPerm_in_entity(node, 0);
		const int  off_ref   = be_get_stack_entity_offset(layout, ent_ref, 0);
		const int  delta_ent = off_ent - off_ref;
		const int  offset    = be_get_MemPerm_offset(node);
		const int  sp_change = (int)get_aligned_sp_change(2);
		return offset + delta_ent + sp_change;
	} else {
		return off_ent;
	}
}

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static void memperm_emit_copy(const ir_node *node, ir_entity *in_ent,
                              ir_entity *out_ent)
{
	ir_graph          *irg     = get_irn_irg(node);
	be_stack_layout_t *layout  = be_get_irg_stack_layout(irg);
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	const char        *reg     = layout->sp_relative ? "sp" : "fp";
	const int          off_in  = get_real_entity_offset(node, in_ent);
	const int          off_out = get_real_entity_offset(node, out_ent);
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	sparc_emitf(node, "ld [%%%s%+d], %%l0", reg, off_in);
	sparc_emitf(node, "st %%l0, [%%%s%+d]", reg, off_out);
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}

static void memperm_emit_swap(const ir_node *node, ir_entity *ent1,
                              ir_entity *ent2)
{
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	ir_graph          *irg    = get_irn_irg(node);
	be_stack_layout_t *layout = be_get_irg_stack_layout(irg);
	const char        *reg    = layout->sp_relative ? "sp" : "fp";
	const int          off1   = get_real_entity_offset(node, ent1);
	const int          off2   = get_real_entity_offset(node, ent2);

	sparc_emitf(node, "ld [%%%s%+d], %%l0", reg, off1);
	sparc_emitf(node, "ld [%%%s%+d], %%l1", reg, off2);
	sparc_emitf(node, "st %%l0, [%%%s%+d]", reg, off2);
	sparc_emitf(node, "st %%l1, [%%%s%+d]", reg, off1);
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}

static int get_index(ir_entity **ents, int n, ir_entity *ent)
{
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	for (int i = 0; i < n; ++i) {
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		if (ents[i] == ent)
			return i;
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	}
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	return -1;
}

/*
 * Emit code for a MemPerm node.
 *
 * Analyze MemPerm for copy chains and cyclic swaps and resolve them using
 * loads and stores.
 * This function is conceptually very similar to permute_values in
 * beprefalloc.c.
 */
static void emit_be_MemPerm(const ir_node *node)
{
	int         memperm_arity = be_get_MemPerm_entity_arity(node);
	/* Upper limit for the number of participating entities is twice the
	 * arity, e.g., for a simple copying MemPerm node with one input/output. */
	int         max_size      = 2 * memperm_arity;
	ir_entity **entities      = ALLOCANZ(ir_entity *, max_size);
	/* sourceof contains the input entity for each entity.  If an entity is
	 * never used as an output, its entry in sourceof is a fix point. */
	int        *sourceof      = ALLOCANZ(int,         max_size);
	/* n_users counts how many output entities use this entity as their input.*/
	int        *n_users       = ALLOCANZ(int,         max_size);
	/* n_spilled records the number of spilled registers, either 1 or 2. */
	int         n_spilled     = 0;

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	for (int i = 0; i < max_size; ++i) {
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		sourceof[i] = i;
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	}

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	int n = 0;
	for (int i = 0; i < memperm_arity; ++i) {
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		ir_entity *out  = be_get_MemPerm_out_entity(node, i);
		ir_entity *in   = be_get_MemPerm_in_entity(node, i);
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		/* Insert into entities to be able to operate on unique indices. */
		if (get_index(entities, n, out) == -1)
			entities[n++] = out;
		if (get_index(entities, n, in) == -1)
			entities[n++] = in;
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		int oidx = get_index(entities, n, out);
		int iidx = get_index(entities, n, in);
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		sourceof[oidx] = iidx;
		++n_users[iidx];
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	}
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	/* First do all the copies. */
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	for (int oidx = 0; oidx < n; /* empty */) {
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		int iidx = sourceof[oidx];

		/* Nothing to do for fix points.
		 * Also, if entities[oidx] is used as an input by another copy, we
		 * can't overwrite entities[oidx] yet.*/
		if (iidx == oidx || n_users[oidx] > 0) {
			++oidx;
			continue;
		}

		/* We found the end of a 'chain', so do the copy. */
		if (n_spilled == 0) {
			memperm_emit_spill_registers(node, n_spilled, /*n_to_spill=*/1);
			n_spilled = 1;
		}
		memperm_emit_copy(node, entities[iidx], entities[oidx]);

		/* Mark as done. */
		sourceof[oidx] = oidx;

		assert(n_users[iidx] > 0);
		--n_users[iidx];

		if (iidx < oidx && n_users[iidx] == 0) {
			oidx = iidx;
		} else {
			++oidx;
		}
	}

	/* The rest are cycles. */
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	for (int oidx = 0; oidx < n; /* empty */) {
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		int iidx = sourceof[oidx];

		if (iidx == oidx) {
			++oidx;
			continue;
		}

		assert(n_users[iidx] == 1);

		if (n_spilled < 2) {
			memperm_emit_spill_registers(node, n_spilled, /*n_to_spill=*/2);
			n_spilled = 2;
		}
		memperm_emit_swap(node, entities[iidx], entities[oidx]);

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		int tidx = sourceof[iidx];
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		sourceof[iidx] = iidx; /* Mark as done. */
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		/* The source of oidx is now the old source of iidx, because we swapped
		 * the two entities. */
		sourceof[oidx] = tidx;
	}

#ifdef DEBUG_libfirm
	/* Only fix points should remain. */
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	for (int i = 0; i < max_size; ++i) {
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		assert(sourceof[i] == i);
	}
#endif

	assert(n_spilled > 0 && "Useless MemPerm node");
	memperm_emit_restore_registers(node, n_spilled);
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}

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static void emit_sparc_Return(const ir_node *node)
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{
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	ir_graph  *irg    = get_irn_irg(node);
	ir_entity *entity = get_irg_entity(irg);
	ir_type   *type   = get_entity_type(entity);

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	const char *destreg = "%o7";

	/* hack: we don't explicitely model register changes because of the
	 * restore node. So we have to do it manually here */
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	const ir_node *delay_slot = pmap_get(ir_node, delay_slots, node);
	if (delay_slot != NULL &&
	    (is_sparc_Restore(delay_slot) || is_sparc_RestoreZero(delay_slot))) {
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		destreg = "%i7";
	}
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	char const *const offset = get_method_calling_convention(type) & cc_compound_ret ? "12" : "8";
	sparc_emitf(node, "jmp %s+%s", destreg, offset);
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	fill_delay_slot(node);
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}

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static const arch_register_t *map_i_to_o_reg(const arch_register_t *reg)
{
	unsigned idx = reg->global_index;
	if (idx < REG_I0 || idx > REG_I7)
		return reg;
	idx += REG_O0 - REG_I0;
	assert(REG_O0 <= idx && idx <= REG_O7);
	return &sparc_registers[idx];
}

static void emit_sparc_Restore(const ir_node *node)
{
	const arch_register_t *destreg
		= arch_get_irn_register_out(node, pn_sparc_Restore_res);
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	sparc_emitf(node, "restore %S2, %SI3, %R", map_i_to_o_reg(destreg));
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}

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static void emit_sparc_FrameAddr(const ir_node *node)
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{
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	const sparc_attr_t *attr   = get_sparc_attr_const(node);
	int32_t             offset = attr->immediate_value;
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	char const *const insn = offset > 0 ? offset = -offset, "sub" : "add";
	assert(sparc_is_value_imm_encodeable(offset));
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	sparc_emitf(node, "%s %S0, %d, %D0", insn, (int)offset);
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}

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static const char *get_icc_unsigned(ir_relation relation)
{
	switch (relation & (ir_relation_less_equal_greater)) {
	case ir_relation_false:              return "bn";
	case ir_relation_equal:              return "be";
	case ir_relation_less:               return "blu";
	case ir_relation_less_equal:         return "bleu";
	case ir_relation_greater:            return "bgu";
	case ir_relation_greater_equal:      return "bgeu";
	case ir_relation_less_greater:       return "bne";
	case ir_relation_less_equal_greater: return "ba";
	default: panic("Cmp has unsupported relation");
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	}
}

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static const char *get_icc_signed(ir_relation relation)
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{
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	switch (relation & (ir_relation_less_equal_greater)) {
	case ir_relation_false:              return "bn";
	case ir_relation_equal:              return "be";
	case ir_relation_less:               return "bl";
	case ir_relation_less_equal:         return "ble";
	case ir_relation_greater:            return "bg";
	case ir_relation_greater_equal:      return "bge";
	case ir_relation_less_greater:       return "bne";
	case ir_relation_less_equal_greater: return "ba";
	default: panic("Cmp has unsupported relation");
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	}
}

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static const char *get_fcc(ir_relation relation)
{
	switch (relation) {
	case ir_relation_false:                   return "fbn";
	case ir_relation_equal:                   return "fbe";
	case ir_relation_less:                    return "fbl";
	case ir_relation_less_equal:              return "fble";
	case ir_relation_greater:                 return "fbg";
	case ir_relation_greater_equal:           return "fbge";
	case ir_relation_less_greater:            return "fblg";
	case ir_relation_less_equal_greater:      return "fbo";
	case ir_relation_unordered:               return "fbu";
	case ir_relation_unordered_equal:         return "fbue";
	case ir_relation_unordered_less:          return "fbul";
	case ir_relation_unordered_less_equal:    return "fbule";
	case ir_relation_unordered_greater:       return "fbug";
	case ir_relation_unordered_greater_equal: return "fbuge";
	case ir_relation_unordered_less_greater:  return "fbne";
	case ir_relation_true:                    return "fba";
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	}
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	panic("invalid relation");
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}

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typedef const char*