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x86/x64: Fix loop realignment.

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This commit is contained in:
Mike Pall 2020-02-02 18:19:44 +01:00
parent bd907032e3
commit 522d2073da
1 changed files with 3 additions and 2 deletions
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5
src/lj_asm_x86.h
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@ -1836,8 +1836,9 @@ static void asm_intarith(ASMState *as, IRIns *ir, x86Arith xa)
int32_t k = 0;
if (as->flagmcp == as->mcp) { /* Drop test r,r instruction. */
MCode *p = as->mcp + ((LJ_64 && *as->mcp < XI_TESTb) ? 3 : 2);
if ((p[1] & 15) < 14) {
if ((p[1] & 15) >= 12) p[1] -= 4; /* L <->S, NL <-> NS */
MCode *q = p[0] == 0x0f ? p+1 : p;
if ((*q & 15) < 14) {
if ((*q & 15) >= 12) *q -= 4; /* L <->S, NL <-> NS */
as->flagmcp = NULL;
as->mcp = p;
} /* else: cannot transform LE/NLE to cc without use of OF. */