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target-ppc: optimize cmp translation

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We know that only one bit (in addition to SO) is going to be set in
the condition register, so do two movconds instead of three setconds,
three shifts and two ORs.

For ppc64-linux-user, the code size reduction is around 5% and the
performance improvement slightly less than 10%.  For softmmu, the
improvement is around 5%.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
pbonzini@redhat.com 2017-12-17 06:49:53 +01:00 committed by David Gibson
parent 9012a53f06
commit b62b368627
1 changed files with 12 additions and 17 deletions
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29
target/ppc/translate.c
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@ -605,27 +605,22 @@ static opc_handler_t invalid_handler = {
static inline void gen_op_cmp(TCGv arg0, TCGv arg1, int s, int crf) static inline void gen_op_cmp(TCGv arg0, TCGv arg1, int s, int crf)
{ {
TCGv t0 = tcg_temp_new(); TCGv t0 = tcg_temp_new();
TCGv_i32 t1 = tcg_temp_new_i32(); TCGv t1 = tcg_temp_new();
TCGv_i32 t = tcg_temp_new_i32();
tcg_gen_movi_tl(t0, CRF_EQ);
tcg_gen_movi_tl(t1, CRF_LT);
tcg_gen_movcond_tl((s ? TCG_COND_LT : TCG_COND_LTU), t0, arg0, arg1, t1, t0);
tcg_gen_movi_tl(t1, CRF_GT);
tcg_gen_movcond_tl((s ? TCG_COND_GT : TCG_COND_GTU), t0, arg0, arg1, t1, t0);
tcg_gen_trunc_tl_i32(t, t0);
tcg_gen_trunc_tl_i32(cpu_crf[crf], cpu_so); tcg_gen_trunc_tl_i32(cpu_crf[crf], cpu_so);
tcg_gen_or_i32(cpu_crf[crf], cpu_crf[crf], t);
tcg_gen_setcond_tl((s ? TCG_COND_LT: TCG_COND_LTU), t0, arg0, arg1);
tcg_gen_trunc_tl_i32(t1, t0);
tcg_gen_shli_i32(t1, t1, CRF_LT_BIT);
tcg_gen_or_i32(cpu_crf[crf], cpu_crf[crf], t1);
tcg_gen_setcond_tl((s ? TCG_COND_GT: TCG_COND_GTU), t0, arg0, arg1);
tcg_gen_trunc_tl_i32(t1, t0);
tcg_gen_shli_i32(t1, t1, CRF_GT_BIT);
tcg_gen_or_i32(cpu_crf[crf], cpu_crf[crf], t1);
tcg_gen_setcond_tl(TCG_COND_EQ, t0, arg0, arg1);
tcg_gen_trunc_tl_i32(t1, t0);
tcg_gen_shli_i32(t1, t1, CRF_EQ_BIT);
tcg_gen_or_i32(cpu_crf[crf], cpu_crf[crf], t1);
tcg_temp_free(t0); tcg_temp_free(t0);
tcg_temp_free_i32(t1); tcg_temp_free(t1);
tcg_temp_free_i32(t);
} }
static inline void gen_op_cmpi(TCGv arg0, target_ulong arg1, int s, int crf) static inline void gen_op_cmpi(TCGv arg0, target_ulong arg1, int s, int crf)