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Avoid zero extension to the same register

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Dmitry Stogov 2022-12-16 13:38:58 +03:00
parent 95729f76bf
commit e884e045de
1 changed files with 4 additions and 1 deletions
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5
ir_x86.dasc
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@ -4308,7 +4308,10 @@ static void ir_emit_zext(ir_ctx *ctx, ir_ref def, ir_insn *insn)
IR_ASSERT(ir_type_size[dst_type] == 8);
IR_ASSERT(sizeof(void*) == 8);
|.if X64
| mov Rd(def_reg), Rd(op1_reg)
/* Avoid zero extension to the same register. This may be not always safe ??? */
if (op1_reg != def_reg) {
| mov Rd(def_reg), Rd(op1_reg)
}
|.endif
}
} else if (IR_IS_CONST_REF(insn->op1)) {