Mostly used for TEST+JG and TEST+JLE, but it is easy to cover
also JBE/JA and JL/JGE; shaves about 0.5% TCG ops.
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
target/i386/tcg/translate.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index 5e326ab1aff..d3bbcf7317c 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -1069,6 +1069,28 @@ static CCPrepare gen_prepare_cc(DisasContext *s, int b,
TCGv reg)
}
break;
+ case CC_OP_LOGICB ... CC_OP_LOGICQ:
+ /* Mostly used for test+jump */
+ size = s->cc_op - CC_OP_LOGICB;
+ switch (jcc_op) {
+ case JCC_BE:
+ /* CF = 0, becomes jz/je */
+ jcc_op = JCC_Z;
+ goto slow_jcc;
+ case JCC_L:
+ /* OF = 0, becomes js/jns */
+ jcc_op = JCC_S;
+ goto slow_jcc;
+ case JCC_LE:
+ /* SF or ZF, becomes signed <= 0 */
+ tcg_gen_ext_tl(cpu_cc_dst, cpu_cc_dst, size | MO_SIGN);
+ cc = (CCPrepare) { .cond = TCG_COND_LE, .reg = cpu_cc_dst };
+ break;
+ default:
+ goto slow_jcc;
+ }
+ break;
+
default:
slow_jcc:
/* This actually generates good code for JC, JZ and JS. */
--
2.47.0
