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Prefer optimization without JMPZNZ instruction

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This commit is contained in:
Dmitry Stogov 2019-10-04 12:51:01 +03:00
parent d44cf9b539
commit dc3c8c75da
1 changed files with 30 additions and 1 deletions
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31
ext/opcache/Optimizer/block_pass.c
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@ -1343,9 +1343,38 @@ next_target:
break;
}
}
/* JMPZ(X,L1), JMP(L2) -> JMPZNZ(X,L1,L2) */
if (target->opcode == ZEND_JMP &&
!(target_block->flags & ZEND_BB_PROTECTED)) {
if (!(target_block->flags & ZEND_BB_TARGET)) {
int next = (target_block - blocks) + 1;
while (next < cfg->blocks_count && !(blocks[next].flags & ZEND_BB_REACHABLE)) {
/* find used one */
next++;
}
if (next < cfg->blocks_count &&
block->successors[0] == next) {
/* JMPZ(X,L1) JMP(L2) L1: -> JMPNZ(X,L2) NOP*/
last_op->opcode = INV_COND(last_op->opcode);
DEL_SOURCE(block, block->successors[1]);
block->successors[0] = target_block->successors[0];
block->successors[1] = next;
ADD_SOURCE(block, block->successors[1]);
target_block->flags &= ~ZEND_BB_REACHABLE;
MAKE_NOP(target);
blocks[next].flags |= ZEND_BB_FOLLOW;
break;
}
}
/* JMPZ(X,L1), JMP(L2) -> JMPZNZ(X,L1,L2) */
DEL_SOURCE(block, block->successors[1]);
if (last_op->opcode == ZEND_JMPZ) {
block->successors[1] = target_block->successors[0];