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x86/x64: Check for jcc when using xor r,r in emit_loadi().

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Thanks to Peter Cawley.
This commit is contained in:
Mike Pall 2018-05-20 12:40:33 +02:00
parent f5d424afe8
commit fb5e522fbc
1 changed files with 4 additions and 2 deletions
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6
src/lj_emit_x86.h
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@ -268,10 +268,12 @@ static void emit_movmroi(ASMState *as, Reg base, int32_t ofs, int32_t i)
/* mov r, i / xor r, r */
static void emit_loadi(ASMState *as, Reg r, int32_t i)
{
/* XOR r,r is shorter, but modifies the flags. This is bad for HIOP. */
/* XOR r,r is shorter, but modifies the flags. This is bad for HIOP/jcc. */
if (i == 0 && !(LJ_32 && (IR(as->curins)->o == IR_HIOP ||
(as->curins+1 < as->T->nins &&
IR(as->curins+1)->o == IR_HIOP)))) {
IR(as->curins+1)->o == IR_HIOP))) &&
!((*as->mcp == 0x0f && (as->mcp[1] & 0xf0) == XI_JCCn) ||
(*as->mcp & 0xf0) == XI_JCCs)) {
emit_rr(as, XO_ARITH(XOg_XOR), r, r);
} else {
MCode *p = as->mcp;