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Fix register allocation for 8 bit stores in x86 backend.

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This commit is contained in:
Mike Pall 2010-12-07 01:18:10 +01:00
parent b3c4c0810a
commit e6093b129a
1 changed files with 10 additions and 2 deletions
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12
src/lj_asm.c
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@ -2010,14 +2010,18 @@ static void asm_fxload(ASMState *as, IRIns *ir)
static void asm_fxstore(ASMState *as, IRIns *ir) static void asm_fxstore(ASMState *as, IRIns *ir)
{ {
RegSet allow = RSET_GPR; RegSet allow = RSET_GPR;
Reg src = RID_NONE; Reg src = RID_NONE, osrc = RID_NONE;
int32_t k = 0; int32_t k = 0;
/* The IRT_I16/IRT_U16 stores should never be simplified for constant /* The IRT_I16/IRT_U16 stores should never be simplified for constant
** values since mov word [mem], imm16 has a length-changing prefix. ** values since mov word [mem], imm16 has a length-changing prefix.
*/ */
if (!asm_isk32(as, ir->op2, &k) || irt_isi16(ir->t) || irt_isu16(ir->t)) { if (!asm_isk32(as, ir->op2, &k) || irt_isi16(ir->t) || irt_isu16(ir->t)) {
RegSet allow8 = (irt_isi8(ir->t) || irt_isu8(ir->t)) ? RSET_GPR8 : RSET_GPR; RegSet allow8 = (irt_isi8(ir->t) || irt_isu8(ir->t)) ? RSET_GPR8 : RSET_GPR;
src = ra_alloc1(as, ir->op2, allow8); src = osrc = ra_alloc1(as, ir->op2, allow8);
if (!LJ_64 && !rset_test(allow8, src)) { /* Already in wrong register. */
rset_clear(allow, osrc);
src = ra_scratch(as, allow8);
}
rset_clear(allow, src); rset_clear(allow, src);
} }
if (ir->o == IR_FSTORE) if (ir->o == IR_FSTORE)
@ -2043,6 +2047,10 @@ static void asm_fxstore(ASMState *as, IRIns *ir)
break; break;
} }
emit_mrm(as, xo, src, RID_MRM); emit_mrm(as, xo, src, RID_MRM);
if (!LJ_64 && src != osrc) {
ra_noweak(as, osrc);
emit_rr(as, XO_MOV, src, osrc);
}
} else { } else {
if (irt_isi8(ir->t) || irt_isu8(ir->t)) { if (irt_isi8(ir->t) || irt_isu8(ir->t)) {
emit_i8(as, k); emit_i8(as, k);