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Fix conflict between loop branch inversion and HREF+NE/EQ merging.

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Mike Pall 2010-11-05 23:12:43 +01:00
parent 188f0b04e1
commit fe21a42a92
1 changed files with 7 additions and 5 deletions
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12
src/lj_asm.c
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@ -1614,11 +1614,13 @@ static MCode *merge_href_niltv(ASMState *as, IRIns *ir)
/* Assumes nothing else generates NE of HREF. */
if ((ir[1].o == IR_NE || ir[1].o == IR_EQ) && ir[1].op1 == as->curins &&
ra_hasreg(ir->r)) {
if (LJ_64 && *as->mcp != XI_ARITHi)
as->mcp += 7+6;
else
as->mcp += 6+6; /* Kill cmp reg, imm32 + jz exit. */
return as->mcp + *(int32_t *)(as->mcp-4); /* Return exit address. */
MCode *p = as->mcp;
p += (LJ_64 && *p != XI_ARITHi) ? 7+6 : 6+6;
/* Ensure no loop branch inversion happened. */
if (p[-6] == 0x0f && p[-5] == XI_JCCn+(CC_NE^(ir[1].o & 1))) {
as->mcp = p; /* Kill cmp reg, imm32 + jz exit. */
return p + *(int32_t *)(p-4); /* Return exit address. */
}
}
return NULL;
}