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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2016-07-31 15:13:09 +1000 |
|---|---|---|
| committer | David Gibson <david@gibson.dropbear.id.au> | 2016-09-07 12:40:12 +1000 |
| commit | accc60c47c9b57f49865d1bed6df3d3085fec81d (patch) | |
| tree | c9a050d055bdec065e94817c72916506bf7c5198 | |
| parent | 4f5d326046fa522010c0a66f1bcaac9068253085 (diff) | |
| download | focaccia-qemu-accc60c47c9b57f49865d1bed6df3d3085fec81d.tar.gz focaccia-qemu-accc60c47c9b57f49865d1bed6df3d3085fec81d.zip | |
ppc: Don't generate dead code on unconditional branches
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 <benh@kernel.crashing.org> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
| -rw-r--r-- | target-ppc/translate.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/target-ppc/translate.c b/target-ppc/translate.c index 0a5a3e21f0..618334ae51 100644 --- a/target-ppc/translate.c +++ b/target-ppc/translate.c @@ -3480,8 +3480,10 @@ 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); @@ -3489,9 +3491,11 @@ 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); |