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FFI: Fix code generation for bool call result check on x86/x64.

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This commit is contained in:
Mike Pall 2013-01-02 23:52:00 +01:00
parent 9827650582
commit 8b97dc738f
1 changed files with 17 additions and 2 deletions
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19
src/lj_asm_x86.h
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@ -2158,12 +2158,27 @@ static void asm_comp(ASMState *as, IRIns *ir, uint32_t cc)
return; return;
} /* Otherwise handle register case as usual. */ } /* Otherwise handle register case as usual. */
} else { } else {
left = asm_fuseloadm(as, lref, RSET_GPR, r64); left = asm_fuseloadm(as, lref,
irt_isu8(ir->t) ? RSET_GPR8 : RSET_GPR, r64);
} }
asm_guardcc(as, cc); asm_guardcc(as, cc);
if (usetest && left != RID_MRM) { if (usetest && left != RID_MRM) {
/* Use test r,r instead of cmp r,0. */ /* Use test r,r instead of cmp r,0. */
emit_rr(as, irt_isu8(ir->t) ? XO_TESTb : XO_TEST, r64 + left, left); x86Op xo = XO_TEST;
if (irt_isu8(ir->t)) {
lua_assert(ir->o == IR_EQ || ir->o == IR_NE);
xo = XO_TESTb;
if (!rset_test(RSET_RANGE(RID_EAX, RID_EBX+1), left)) {
if (LJ_64) {
left |= FORCE_REX;
} else {
emit_i32(as, 0xff);
emit_mrm(as, XO_GROUP3, XOg_TEST, left);
return;
}
}
}
emit_rr(as, xo, r64 + left, left);
if (irl+1 == ir) /* Referencing previous ins? */ if (irl+1 == ir) /* Referencing previous ins? */
as->flagmcp = as->mcp; /* Set flag to drop test r,r if possible. */ as->flagmcp = as->mcp; /* Set flag to drop test r,r if possible. */
} else { } else {