804 lines
25 KiB
C
804 lines
25 KiB
C
/*
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* Optimizations for Tiny Code Generator for QEMU
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*
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* Copyright (c) 2010 Samsung Electronics.
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* Contributed by Kirill Batuzov <batuzovk@ispras.ru>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include "qemu-common.h"
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#include "tcg-op.h"
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#define CASE_OP_32_64(x) \
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glue(glue(case INDEX_op_, x), _i32): \
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glue(glue(case INDEX_op_, x), _i64)
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typedef enum {
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TCG_TEMP_UNDEF = 0,
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TCG_TEMP_CONST,
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TCG_TEMP_COPY,
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} tcg_temp_state;
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struct tcg_temp_info {
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tcg_temp_state state;
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uint16_t prev_copy;
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uint16_t next_copy;
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tcg_target_ulong val;
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};
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static struct tcg_temp_info temps[TCG_MAX_TEMPS];
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/* Reset TEMP's state to TCG_TEMP_UNDEF. If TEMP only had one copy, remove
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the copy flag from the left temp. */
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static void reset_temp(TCGArg temp)
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{
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if (temps[temp].state == TCG_TEMP_COPY) {
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if (temps[temp].prev_copy == temps[temp].next_copy) {
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temps[temps[temp].next_copy].state = TCG_TEMP_UNDEF;
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} else {
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temps[temps[temp].next_copy].prev_copy = temps[temp].prev_copy;
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temps[temps[temp].prev_copy].next_copy = temps[temp].next_copy;
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}
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}
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temps[temp].state = TCG_TEMP_UNDEF;
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}
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static int op_bits(TCGOpcode op)
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{
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const TCGOpDef *def = &tcg_op_defs[op];
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return def->flags & TCG_OPF_64BIT ? 64 : 32;
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}
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static TCGOpcode op_to_movi(TCGOpcode op)
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{
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switch (op_bits(op)) {
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case 32:
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return INDEX_op_movi_i32;
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case 64:
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return INDEX_op_movi_i64;
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default:
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fprintf(stderr, "op_to_movi: unexpected return value of "
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"function op_bits.\n");
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tcg_abort();
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}
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}
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static TCGArg find_better_copy(TCGContext *s, TCGArg temp)
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{
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TCGArg i;
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/* If this is already a global, we can't do better. */
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if (temp < s->nb_globals) {
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return temp;
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}
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/* Search for a global first. */
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for (i = temps[temp].next_copy ; i != temp ; i = temps[i].next_copy) {
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if (i < s->nb_globals) {
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return i;
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}
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}
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/* If it is a temp, search for a temp local. */
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if (!s->temps[temp].temp_local) {
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for (i = temps[temp].next_copy ; i != temp ; i = temps[i].next_copy) {
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if (s->temps[i].temp_local) {
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return i;
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}
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}
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}
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/* Failure to find a better representation, return the same temp. */
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return temp;
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}
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static bool temps_are_copies(TCGArg arg1, TCGArg arg2)
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{
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TCGArg i;
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if (arg1 == arg2) {
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return true;
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}
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if (temps[arg1].state != TCG_TEMP_COPY
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|| temps[arg2].state != TCG_TEMP_COPY) {
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return false;
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}
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for (i = temps[arg1].next_copy ; i != arg1 ; i = temps[i].next_copy) {
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if (i == arg2) {
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return true;
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}
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}
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return false;
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}
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static void tcg_opt_gen_mov(TCGContext *s, TCGArg *gen_args,
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TCGArg dst, TCGArg src)
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{
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reset_temp(dst);
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assert(temps[src].state != TCG_TEMP_CONST);
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if (s->temps[src].type == s->temps[dst].type) {
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if (temps[src].state != TCG_TEMP_COPY) {
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temps[src].state = TCG_TEMP_COPY;
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temps[src].next_copy = src;
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temps[src].prev_copy = src;
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}
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temps[dst].state = TCG_TEMP_COPY;
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temps[dst].next_copy = temps[src].next_copy;
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temps[dst].prev_copy = src;
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temps[temps[dst].next_copy].prev_copy = dst;
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temps[src].next_copy = dst;
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}
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gen_args[0] = dst;
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gen_args[1] = src;
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}
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static void tcg_opt_gen_movi(TCGArg *gen_args, TCGArg dst, TCGArg val)
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{
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reset_temp(dst);
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temps[dst].state = TCG_TEMP_CONST;
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temps[dst].val = val;
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gen_args[0] = dst;
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gen_args[1] = val;
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}
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static TCGOpcode op_to_mov(TCGOpcode op)
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{
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switch (op_bits(op)) {
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case 32:
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return INDEX_op_mov_i32;
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case 64:
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return INDEX_op_mov_i64;
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default:
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fprintf(stderr, "op_to_mov: unexpected return value of "
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"function op_bits.\n");
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tcg_abort();
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}
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}
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static TCGArg do_constant_folding_2(TCGOpcode op, TCGArg x, TCGArg y)
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{
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switch (op) {
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CASE_OP_32_64(add):
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return x + y;
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CASE_OP_32_64(sub):
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return x - y;
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CASE_OP_32_64(mul):
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return x * y;
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CASE_OP_32_64(and):
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return x & y;
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CASE_OP_32_64(or):
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return x | y;
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CASE_OP_32_64(xor):
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return x ^ y;
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case INDEX_op_shl_i32:
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return (uint32_t)x << (uint32_t)y;
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case INDEX_op_shl_i64:
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return (uint64_t)x << (uint64_t)y;
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case INDEX_op_shr_i32:
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return (uint32_t)x >> (uint32_t)y;
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case INDEX_op_shr_i64:
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return (uint64_t)x >> (uint64_t)y;
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case INDEX_op_sar_i32:
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return (int32_t)x >> (int32_t)y;
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case INDEX_op_sar_i64:
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return (int64_t)x >> (int64_t)y;
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case INDEX_op_rotr_i32:
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x = ((uint32_t)x << (32 - y)) | ((uint32_t)x >> y);
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return x;
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case INDEX_op_rotr_i64:
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x = ((uint64_t)x << (64 - y)) | ((uint64_t)x >> y);
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return x;
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case INDEX_op_rotl_i32:
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x = ((uint32_t)x << y) | ((uint32_t)x >> (32 - y));
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return x;
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case INDEX_op_rotl_i64:
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x = ((uint64_t)x << y) | ((uint64_t)x >> (64 - y));
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return x;
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CASE_OP_32_64(not):
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return ~x;
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CASE_OP_32_64(neg):
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return -x;
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CASE_OP_32_64(andc):
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return x & ~y;
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CASE_OP_32_64(orc):
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return x | ~y;
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CASE_OP_32_64(eqv):
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return ~(x ^ y);
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CASE_OP_32_64(nand):
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return ~(x & y);
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CASE_OP_32_64(nor):
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return ~(x | y);
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CASE_OP_32_64(ext8s):
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return (int8_t)x;
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CASE_OP_32_64(ext16s):
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return (int16_t)x;
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CASE_OP_32_64(ext8u):
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return (uint8_t)x;
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CASE_OP_32_64(ext16u):
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return (uint16_t)x;
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case INDEX_op_ext32s_i64:
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return (int32_t)x;
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case INDEX_op_ext32u_i64:
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return (uint32_t)x;
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default:
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fprintf(stderr,
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"Unrecognized operation %d in do_constant_folding.\n", op);
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tcg_abort();
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}
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}
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static TCGArg do_constant_folding(TCGOpcode op, TCGArg x, TCGArg y)
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{
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TCGArg res = do_constant_folding_2(op, x, y);
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if (op_bits(op) == 32) {
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res &= 0xffffffff;
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}
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return res;
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}
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/* Return 2 if the condition can't be simplified, and the result
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of the condition (0 or 1) if it can */
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static TCGArg do_constant_folding_cond(TCGOpcode op, TCGArg x,
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TCGArg y, TCGCond c)
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{
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if (temps[x].state == TCG_TEMP_CONST && temps[y].state == TCG_TEMP_CONST) {
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switch (op_bits(op)) {
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case 32:
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switch (c) {
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case TCG_COND_EQ:
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return (uint32_t)temps[x].val == (uint32_t)temps[y].val;
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case TCG_COND_NE:
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return (uint32_t)temps[x].val != (uint32_t)temps[y].val;
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case TCG_COND_LT:
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return (int32_t)temps[x].val < (int32_t)temps[y].val;
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case TCG_COND_GE:
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return (int32_t)temps[x].val >= (int32_t)temps[y].val;
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case TCG_COND_LE:
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return (int32_t)temps[x].val <= (int32_t)temps[y].val;
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case TCG_COND_GT:
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return (int32_t)temps[x].val > (int32_t)temps[y].val;
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case TCG_COND_LTU:
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return (uint32_t)temps[x].val < (uint32_t)temps[y].val;
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case TCG_COND_GEU:
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return (uint32_t)temps[x].val >= (uint32_t)temps[y].val;
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case TCG_COND_LEU:
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return (uint32_t)temps[x].val <= (uint32_t)temps[y].val;
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case TCG_COND_GTU:
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return (uint32_t)temps[x].val > (uint32_t)temps[y].val;
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}
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break;
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case 64:
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switch (c) {
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case TCG_COND_EQ:
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return (uint64_t)temps[x].val == (uint64_t)temps[y].val;
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case TCG_COND_NE:
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return (uint64_t)temps[x].val != (uint64_t)temps[y].val;
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case TCG_COND_LT:
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return (int64_t)temps[x].val < (int64_t)temps[y].val;
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case TCG_COND_GE:
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return (int64_t)temps[x].val >= (int64_t)temps[y].val;
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case TCG_COND_LE:
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return (int64_t)temps[x].val <= (int64_t)temps[y].val;
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case TCG_COND_GT:
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return (int64_t)temps[x].val > (int64_t)temps[y].val;
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case TCG_COND_LTU:
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return (uint64_t)temps[x].val < (uint64_t)temps[y].val;
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case TCG_COND_GEU:
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return (uint64_t)temps[x].val >= (uint64_t)temps[y].val;
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case TCG_COND_LEU:
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return (uint64_t)temps[x].val <= (uint64_t)temps[y].val;
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case TCG_COND_GTU:
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return (uint64_t)temps[x].val > (uint64_t)temps[y].val;
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}
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break;
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}
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} else if (temps_are_copies(x, y)) {
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switch (c) {
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case TCG_COND_GT:
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case TCG_COND_LTU:
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case TCG_COND_LT:
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case TCG_COND_GTU:
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case TCG_COND_NE:
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return 0;
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case TCG_COND_GE:
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case TCG_COND_GEU:
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case TCG_COND_LE:
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case TCG_COND_LEU:
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case TCG_COND_EQ:
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return 1;
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}
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} else if (temps[y].state == TCG_TEMP_CONST && temps[y].val == 0) {
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switch (c) {
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case TCG_COND_LTU:
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return 0;
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case TCG_COND_GEU:
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return 1;
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default:
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return 2;
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}
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} else {
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return 2;
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}
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fprintf(stderr,
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"Unrecognized bitness %d or condition %d in "
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"do_constant_folding_cond.\n", op_bits(op), c);
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tcg_abort();
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}
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/* Propagate constants and copies, fold constant expressions. */
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static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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TCGArg *args, TCGOpDef *tcg_op_defs)
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{
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int i, nb_ops, op_index, nb_temps, nb_globals, nb_call_args;
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TCGOpcode op;
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const TCGOpDef *def;
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TCGArg *gen_args;
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TCGArg tmp;
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TCGCond cond;
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/* Array VALS has an element for each temp.
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If this temp holds a constant then its value is kept in VALS' element.
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If this temp is a copy of other ones then the other copies are
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available through the doubly linked circular list. */
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nb_temps = s->nb_temps;
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nb_globals = s->nb_globals;
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memset(temps, 0, nb_temps * sizeof(struct tcg_temp_info));
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nb_ops = tcg_opc_ptr - gen_opc_buf;
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gen_args = args;
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for (op_index = 0; op_index < nb_ops; op_index++) {
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op = gen_opc_buf[op_index];
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def = &tcg_op_defs[op];
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/* Do copy propagation */
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if (op == INDEX_op_call) {
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int nb_oargs = args[0] >> 16;
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int nb_iargs = args[0] & 0xffff;
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for (i = nb_oargs + 1; i < nb_oargs + nb_iargs + 1; i++) {
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if (temps[args[i]].state == TCG_TEMP_COPY) {
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args[i] = find_better_copy(s, args[i]);
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}
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}
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} else {
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for (i = def->nb_oargs; i < def->nb_oargs + def->nb_iargs; i++) {
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if (temps[args[i]].state == TCG_TEMP_COPY) {
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args[i] = find_better_copy(s, args[i]);
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}
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}
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}
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/* For commutative operations make constant second argument */
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switch (op) {
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CASE_OP_32_64(add):
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CASE_OP_32_64(mul):
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CASE_OP_32_64(and):
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CASE_OP_32_64(or):
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CASE_OP_32_64(xor):
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CASE_OP_32_64(eqv):
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CASE_OP_32_64(nand):
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CASE_OP_32_64(nor):
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/* Prefer the constant in second argument, and then the form
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op a, a, b, which is better handled on non-RISC hosts. */
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if (temps[args[1]].state == TCG_TEMP_CONST || (args[0] == args[2]
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&& temps[args[2]].state != TCG_TEMP_CONST)) {
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tmp = args[1];
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args[1] = args[2];
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args[2] = tmp;
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}
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break;
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CASE_OP_32_64(brcond):
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if (temps[args[0]].state == TCG_TEMP_CONST
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&& temps[args[1]].state != TCG_TEMP_CONST) {
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tmp = args[0];
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args[0] = args[1];
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args[1] = tmp;
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args[2] = tcg_swap_cond(args[2]);
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}
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break;
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CASE_OP_32_64(setcond):
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if (temps[args[1]].state == TCG_TEMP_CONST
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&& temps[args[2]].state != TCG_TEMP_CONST) {
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tmp = args[1];
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args[1] = args[2];
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args[2] = tmp;
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args[3] = tcg_swap_cond(args[3]);
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}
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break;
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CASE_OP_32_64(movcond):
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cond = args[5];
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if (temps[args[1]].state == TCG_TEMP_CONST
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&& temps[args[2]].state != TCG_TEMP_CONST) {
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tmp = args[1];
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args[1] = args[2];
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args[2] = tmp;
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cond = tcg_swap_cond(cond);
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}
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/* For movcond, we canonicalize the "false" input reg to match
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the destination reg so that the tcg backend can implement
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a "move if true" operation. */
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if (args[0] == args[3]) {
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tmp = args[3];
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args[3] = args[4];
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args[4] = tmp;
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cond = tcg_invert_cond(cond);
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}
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args[5] = cond;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Simplify expressions for "shift/rot r, 0, a => movi r, 0" */
|
|
switch (op) {
|
|
CASE_OP_32_64(shl):
|
|
CASE_OP_32_64(shr):
|
|
CASE_OP_32_64(sar):
|
|
CASE_OP_32_64(rotl):
|
|
CASE_OP_32_64(rotr):
|
|
if (temps[args[1]].state == TCG_TEMP_CONST
|
|
&& temps[args[1]].val == 0) {
|
|
gen_opc_buf[op_index] = op_to_movi(op);
|
|
tcg_opt_gen_movi(gen_args, args[0], 0);
|
|
args += 3;
|
|
gen_args += 2;
|
|
continue;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Simplify expression for "op r, a, 0 => mov r, a" cases */
|
|
switch (op) {
|
|
CASE_OP_32_64(add):
|
|
CASE_OP_32_64(sub):
|
|
CASE_OP_32_64(shl):
|
|
CASE_OP_32_64(shr):
|
|
CASE_OP_32_64(sar):
|
|
CASE_OP_32_64(rotl):
|
|
CASE_OP_32_64(rotr):
|
|
CASE_OP_32_64(or):
|
|
CASE_OP_32_64(xor):
|
|
if (temps[args[1]].state == TCG_TEMP_CONST) {
|
|
/* Proceed with possible constant folding. */
|
|
break;
|
|
}
|
|
if (temps[args[2]].state == TCG_TEMP_CONST
|
|
&& temps[args[2]].val == 0) {
|
|
if (temps_are_copies(args[0], args[1])) {
|
|
gen_opc_buf[op_index] = INDEX_op_nop;
|
|
} else {
|
|
gen_opc_buf[op_index] = op_to_mov(op);
|
|
tcg_opt_gen_mov(s, gen_args, args[0], args[1]);
|
|
gen_args += 2;
|
|
}
|
|
args += 3;
|
|
continue;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Simplify expression for "op r, a, 0 => movi r, 0" cases */
|
|
switch (op) {
|
|
CASE_OP_32_64(and):
|
|
CASE_OP_32_64(mul):
|
|
if ((temps[args[2]].state == TCG_TEMP_CONST
|
|
&& temps[args[2]].val == 0)) {
|
|
gen_opc_buf[op_index] = op_to_movi(op);
|
|
tcg_opt_gen_movi(gen_args, args[0], 0);
|
|
args += 3;
|
|
gen_args += 2;
|
|
continue;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Simplify expression for "op r, a, a => mov r, a" cases */
|
|
switch (op) {
|
|
CASE_OP_32_64(or):
|
|
CASE_OP_32_64(and):
|
|
if (temps_are_copies(args[1], args[2])) {
|
|
if (temps_are_copies(args[0], args[1])) {
|
|
gen_opc_buf[op_index] = INDEX_op_nop;
|
|
} else {
|
|
gen_opc_buf[op_index] = op_to_mov(op);
|
|
tcg_opt_gen_mov(s, gen_args, args[0], args[1]);
|
|
gen_args += 2;
|
|
}
|
|
args += 3;
|
|
continue;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Simplify expression for "op r, a, a => movi r, 0" cases */
|
|
switch (op) {
|
|
CASE_OP_32_64(sub):
|
|
CASE_OP_32_64(xor):
|
|
if (temps_are_copies(args[1], args[2])) {
|
|
gen_opc_buf[op_index] = op_to_movi(op);
|
|
tcg_opt_gen_movi(gen_args, args[0], 0);
|
|
gen_args += 2;
|
|
args += 3;
|
|
continue;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Propagate constants through copy operations and do constant
|
|
folding. Constants will be substituted to arguments by register
|
|
allocator where needed and possible. Also detect copies. */
|
|
switch (op) {
|
|
CASE_OP_32_64(mov):
|
|
if (temps_are_copies(args[0], args[1])) {
|
|
args += 2;
|
|
gen_opc_buf[op_index] = INDEX_op_nop;
|
|
break;
|
|
}
|
|
if (temps[args[1]].state != TCG_TEMP_CONST) {
|
|
tcg_opt_gen_mov(s, gen_args, args[0], args[1]);
|
|
gen_args += 2;
|
|
args += 2;
|
|
break;
|
|
}
|
|
/* Source argument is constant. Rewrite the operation and
|
|
let movi case handle it. */
|
|
op = op_to_movi(op);
|
|
gen_opc_buf[op_index] = op;
|
|
args[1] = temps[args[1]].val;
|
|
/* fallthrough */
|
|
CASE_OP_32_64(movi):
|
|
tcg_opt_gen_movi(gen_args, args[0], args[1]);
|
|
gen_args += 2;
|
|
args += 2;
|
|
break;
|
|
CASE_OP_32_64(not):
|
|
CASE_OP_32_64(neg):
|
|
CASE_OP_32_64(ext8s):
|
|
CASE_OP_32_64(ext8u):
|
|
CASE_OP_32_64(ext16s):
|
|
CASE_OP_32_64(ext16u):
|
|
case INDEX_op_ext32s_i64:
|
|
case INDEX_op_ext32u_i64:
|
|
if (temps[args[1]].state == TCG_TEMP_CONST) {
|
|
gen_opc_buf[op_index] = op_to_movi(op);
|
|
tmp = do_constant_folding(op, temps[args[1]].val, 0);
|
|
tcg_opt_gen_movi(gen_args, args[0], tmp);
|
|
} else {
|
|
reset_temp(args[0]);
|
|
gen_args[0] = args[0];
|
|
gen_args[1] = args[1];
|
|
}
|
|
gen_args += 2;
|
|
args += 2;
|
|
break;
|
|
CASE_OP_32_64(add):
|
|
CASE_OP_32_64(sub):
|
|
CASE_OP_32_64(mul):
|
|
CASE_OP_32_64(or):
|
|
CASE_OP_32_64(and):
|
|
CASE_OP_32_64(xor):
|
|
CASE_OP_32_64(shl):
|
|
CASE_OP_32_64(shr):
|
|
CASE_OP_32_64(sar):
|
|
CASE_OP_32_64(rotl):
|
|
CASE_OP_32_64(rotr):
|
|
CASE_OP_32_64(andc):
|
|
CASE_OP_32_64(orc):
|
|
CASE_OP_32_64(eqv):
|
|
CASE_OP_32_64(nand):
|
|
CASE_OP_32_64(nor):
|
|
if (temps[args[1]].state == TCG_TEMP_CONST
|
|
&& temps[args[2]].state == TCG_TEMP_CONST) {
|
|
gen_opc_buf[op_index] = op_to_movi(op);
|
|
tmp = do_constant_folding(op, temps[args[1]].val,
|
|
temps[args[2]].val);
|
|
tcg_opt_gen_movi(gen_args, args[0], tmp);
|
|
gen_args += 2;
|
|
} else {
|
|
reset_temp(args[0]);
|
|
gen_args[0] = args[0];
|
|
gen_args[1] = args[1];
|
|
gen_args[2] = args[2];
|
|
gen_args += 3;
|
|
}
|
|
args += 3;
|
|
break;
|
|
CASE_OP_32_64(deposit):
|
|
if (temps[args[1]].state == TCG_TEMP_CONST
|
|
&& temps[args[2]].state == TCG_TEMP_CONST) {
|
|
gen_opc_buf[op_index] = op_to_movi(op);
|
|
tmp = ((1ull << args[4]) - 1);
|
|
tmp = (temps[args[1]].val & ~(tmp << args[3]))
|
|
| ((temps[args[2]].val & tmp) << args[3]);
|
|
tcg_opt_gen_movi(gen_args, args[0], tmp);
|
|
gen_args += 2;
|
|
} else {
|
|
reset_temp(args[0]);
|
|
gen_args[0] = args[0];
|
|
gen_args[1] = args[1];
|
|
gen_args[2] = args[2];
|
|
gen_args[3] = args[3];
|
|
gen_args[4] = args[4];
|
|
gen_args += 5;
|
|
}
|
|
args += 5;
|
|
break;
|
|
CASE_OP_32_64(setcond):
|
|
tmp = do_constant_folding_cond(op, args[1], args[2], args[3]);
|
|
if (tmp != 2) {
|
|
gen_opc_buf[op_index] = op_to_movi(op);
|
|
tcg_opt_gen_movi(gen_args, args[0], tmp);
|
|
gen_args += 2;
|
|
} else {
|
|
reset_temp(args[0]);
|
|
gen_args[0] = args[0];
|
|
gen_args[1] = args[1];
|
|
gen_args[2] = args[2];
|
|
gen_args[3] = args[3];
|
|
gen_args += 4;
|
|
}
|
|
args += 4;
|
|
break;
|
|
CASE_OP_32_64(brcond):
|
|
tmp = do_constant_folding_cond(op, args[0], args[1], args[2]);
|
|
if (tmp != 2) {
|
|
if (tmp) {
|
|
memset(temps, 0, nb_temps * sizeof(struct tcg_temp_info));
|
|
gen_opc_buf[op_index] = INDEX_op_br;
|
|
gen_args[0] = args[3];
|
|
gen_args += 1;
|
|
} else {
|
|
gen_opc_buf[op_index] = INDEX_op_nop;
|
|
}
|
|
} else {
|
|
memset(temps, 0, nb_temps * sizeof(struct tcg_temp_info));
|
|
reset_temp(args[0]);
|
|
gen_args[0] = args[0];
|
|
gen_args[1] = args[1];
|
|
gen_args[2] = args[2];
|
|
gen_args[3] = args[3];
|
|
gen_args += 4;
|
|
}
|
|
args += 4;
|
|
break;
|
|
CASE_OP_32_64(movcond):
|
|
tmp = do_constant_folding_cond(op, args[1], args[2], args[5]);
|
|
if (tmp != 2) {
|
|
if (temps_are_copies(args[0], args[4-tmp])) {
|
|
gen_opc_buf[op_index] = INDEX_op_nop;
|
|
} else if (temps[args[4-tmp]].state == TCG_TEMP_CONST) {
|
|
gen_opc_buf[op_index] = op_to_movi(op);
|
|
tcg_opt_gen_movi(gen_args, args[0], temps[args[4-tmp]].val);
|
|
gen_args += 2;
|
|
} else {
|
|
gen_opc_buf[op_index] = op_to_mov(op);
|
|
tcg_opt_gen_mov(s, gen_args, args[0], args[4-tmp]);
|
|
gen_args += 2;
|
|
}
|
|
} else {
|
|
reset_temp(args[0]);
|
|
gen_args[0] = args[0];
|
|
gen_args[1] = args[1];
|
|
gen_args[2] = args[2];
|
|
gen_args[3] = args[3];
|
|
gen_args[4] = args[4];
|
|
gen_args[5] = args[5];
|
|
gen_args += 6;
|
|
}
|
|
args += 6;
|
|
break;
|
|
case INDEX_op_call:
|
|
nb_call_args = (args[0] >> 16) + (args[0] & 0xffff);
|
|
if (!(args[nb_call_args + 1] & (TCG_CALL_CONST | TCG_CALL_PURE))) {
|
|
for (i = 0; i < nb_globals; i++) {
|
|
reset_temp(i);
|
|
}
|
|
}
|
|
for (i = 0; i < (args[0] >> 16); i++) {
|
|
reset_temp(args[i + 1]);
|
|
}
|
|
i = nb_call_args + 3;
|
|
while (i) {
|
|
*gen_args = *args;
|
|
args++;
|
|
gen_args++;
|
|
i--;
|
|
}
|
|
break;
|
|
default:
|
|
/* Default case: we do know nothing about operation so no
|
|
propagation is done. We trash everything if the operation
|
|
is the end of a basic block, otherwise we only trash the
|
|
output args. */
|
|
if (def->flags & TCG_OPF_BB_END) {
|
|
memset(temps, 0, nb_temps * sizeof(struct tcg_temp_info));
|
|
} else {
|
|
for (i = 0; i < def->nb_oargs; i++) {
|
|
reset_temp(args[i]);
|
|
}
|
|
}
|
|
for (i = 0; i < def->nb_args; i++) {
|
|
gen_args[i] = args[i];
|
|
}
|
|
args += def->nb_args;
|
|
gen_args += def->nb_args;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return gen_args;
|
|
}
|
|
|
|
TCGArg *tcg_optimize(TCGContext *s, uint16_t *tcg_opc_ptr,
|
|
TCGArg *args, TCGOpDef *tcg_op_defs)
|
|
{
|
|
TCGArg *res;
|
|
res = tcg_constant_folding(s, tcg_opc_ptr, args, tcg_op_defs);
|
|
return res;
|
|
}
|