[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH 1/5] ppc: Don't generate dead code on unconditional
From: |
Benjamin Herrenschmidt |
Subject: |
[Qemu-devel] [PATCH 1/5] ppc: Don't generate dead code on unconditional branches |
Date: |
Sun, 31 Jul 2016 15:13:09 +1000 |
We are always generating the "else" case of the condition even when
generating an unconditional branch that will never hit it.
Signed-off-by: Benjamin Herrenschmidt <address@hidden>
---
target-ppc/translate.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index d1837f8..47eb9ed 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -3479,8 +3479,10 @@ static inline void gen_bcond(DisasContext *ctx, int type)
} else {
gen_goto_tb(ctx, 0, li);
}
- gen_set_label(l1);
- gen_goto_tb(ctx, 1, ctx->nip);
+ if ((bo & 0x14) != 0x14) {
+ gen_set_label(l1);
+ gen_goto_tb(ctx, 1, ctx->nip);
+ }
} else {
if (NARROW_MODE(ctx)) {
tcg_gen_andi_tl(cpu_nip, target, (uint32_t)~3);
@@ -3488,9 +3490,11 @@ static inline void gen_bcond(DisasContext *ctx, int type)
tcg_gen_andi_tl(cpu_nip, target, ~3);
}
tcg_gen_exit_tb(0);
- gen_set_label(l1);
- gen_update_nip(ctx, ctx->nip);
- tcg_gen_exit_tb(0);
+ if ((bo & 0x14) != 0x14) {
+ gen_set_label(l1);
+ gen_update_nip(ctx, ctx->nip);
+ tcg_gen_exit_tb(0);
+ }
}
if (type == BCOND_LR || type == BCOND_CTR || type == BCOND_TAR) {
tcg_temp_free(target);
--
2.7.4
- [Qemu-devel] [PATCH 1/5] ppc: Don't generate dead code on unconditional branches,
Benjamin Herrenschmidt <=