From: "Edgar E. Iglesias" <edgar.igles...@gmail.com>
write_carry only looks at bit zero, no need to mask out the others.
Meassured a 12% speed improvement in linux-user srl loops.
Signed-off-by: Edgar E. Iglesias <edgar.igles...@gmail.com>
---
target-microblaze/translate.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/target-microblaze/translate.c b/target-microblaze/translate.c
index 916db15..93aafac 100644
--- a/target-microblaze/translate.c
+++ b/target-microblaze/translate.c
@@ -780,13 +780,10 @@ static void dec_bit(DisasContext *dc)
case 0x1:
case 0x41:
/* srl. */
- t0 = tcg_temp_new();
LOG_DIS("srl r%d r%d\n", dc->rd, dc->ra);
- /* Update carry. */
- tcg_gen_andi_tl(t0, cpu_R[dc->ra], 1);
- write_carry(dc, t0);
- tcg_temp_free(t0);
+ /* Update carry. Note that write carry only looks at the LSB. */
+ write_carry(dc, cpu_R[dc->ra]);
if (dc->rd) {
if (op == 0x41)
tcg_gen_shri_tl(cpu_R[dc->rd], cpu_R[dc->ra], 1);
--
1.7.10.4
