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target-ppc: Compute arithmetic shift carry without branches 

Cc: Alexander Graf <agraf@suse.de>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Richard Henderson 2013-02-19 23:52:19 -08:00 committed by Blue Swirl
parent fd3f0081e5
commit ba4af3e422
1 changed files with 31 additions and 40 deletions
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71
target-ppc/translate.c
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@ -1773,30 +1773,25 @@ static void gen_sraw(DisasContext *ctx)
static void gen_srawi(DisasContext *ctx)
{
int sh = SH(ctx->opcode);
if (sh != 0) {
int l1, l2;
TCGv t0;
l1 = gen_new_label();
l2 = gen_new_label();
t0 = tcg_temp_local_new();
tcg_gen_ext32s_tl(t0, cpu_gpr[rS(ctx->opcode)]);
tcg_gen_brcondi_tl(TCG_COND_GE, t0, 0, l1);
tcg_gen_andi_tl(t0, cpu_gpr[rS(ctx->opcode)], (1ULL << sh) - 1);
tcg_gen_brcondi_tl(TCG_COND_EQ, t0, 0, l1);
tcg_gen_movi_tl(cpu_ca, 1);
tcg_gen_br(l2);
gen_set_label(l1);
TCGv dst = cpu_gpr[rA(ctx->opcode)];
TCGv src = cpu_gpr[rS(ctx->opcode)];
if (sh == 0) {
tcg_gen_mov_tl(dst, src);
tcg_gen_movi_tl(cpu_ca, 0);
gen_set_label(l2);
tcg_gen_ext32s_tl(t0, cpu_gpr[rS(ctx->opcode)]);
tcg_gen_sari_tl(cpu_gpr[rA(ctx->opcode)], t0, sh);
tcg_temp_free(t0);
} else {
tcg_gen_mov_tl(cpu_gpr[rA(ctx->opcode)], cpu_gpr[rS(ctx->opcode)]);
tcg_gen_movi_tl(cpu_ca, 0);
TCGv t0;
tcg_gen_ext32s_tl(dst, src);
tcg_gen_andi_tl(cpu_ca, dst, (1ULL << sh) - 1);
t0 = tcg_temp_new();
tcg_gen_sari_tl(t0, dst, TARGET_LONG_BITS - 1);
tcg_gen_and_tl(cpu_ca, cpu_ca, t0);
tcg_temp_free(t0);
tcg_gen_setcondi_tl(TCG_COND_NE, cpu_ca, cpu_ca, 0);
tcg_gen_sari_tl(dst, dst, sh);
}
if (unlikely(Rc(ctx->opcode) != 0)) {
gen_set_Rc0(ctx, dst);
}
if (unlikely(Rc(ctx->opcode) != 0))
gen_set_Rc0(ctx, cpu_gpr[rA(ctx->opcode)]);
}
/* srw & srw. */
@ -1856,28 +1851,24 @@ static void gen_srad(DisasContext *ctx)
static inline void gen_sradi(DisasContext *ctx, int n)
{
int sh = SH(ctx->opcode) + (n << 5);
if (sh != 0) {
int l1, l2;
TCGv t0;
l1 = gen_new_label();
l2 = gen_new_label();
t0 = tcg_temp_local_new();
tcg_gen_brcondi_tl(TCG_COND_GE, cpu_gpr[rS(ctx->opcode)], 0, l1);
tcg_gen_andi_tl(t0, cpu_gpr[rS(ctx->opcode)], (1ULL << sh) - 1);
tcg_gen_brcondi_tl(TCG_COND_EQ, t0, 0, l1);
tcg_gen_movi_tl(cpu_ca, 1);
tcg_gen_br(l2);
gen_set_label(l1);
TCGv dst = cpu_gpr[rA(ctx->opcode)];
TCGv src = cpu_gpr[rS(ctx->opcode)];
if (sh == 0) {
tcg_gen_mov_tl(dst, src);
tcg_gen_movi_tl(cpu_ca, 0);
gen_set_label(l2);
tcg_temp_free(t0);
tcg_gen_sari_tl(cpu_gpr[rA(ctx->opcode)], cpu_gpr[rS(ctx->opcode)], sh);
} else {
tcg_gen_mov_tl(cpu_gpr[rA(ctx->opcode)], cpu_gpr[rS(ctx->opcode)]);
tcg_gen_movi_tl(cpu_ca, 0);
TCGv t0;
tcg_gen_andi_tl(cpu_ca, src, (1ULL << sh) - 1);
t0 = tcg_temp_new();
tcg_gen_sari_tl(t0, src, TARGET_LONG_BITS - 1);
tcg_gen_and_tl(cpu_ca, cpu_ca, t0);
tcg_temp_free(t0);
tcg_gen_setcondi_tl(TCG_COND_NE, cpu_ca, cpu_ca, 0);
tcg_gen_sari_tl(dst, src, sh);
}
if (unlikely(Rc(ctx->opcode) != 0)) {
gen_set_Rc0(ctx, dst);
}
if (unlikely(Rc(ctx->opcode) != 0))
gen_set_Rc0(ctx, cpu_gpr[rA(ctx->opcode)]);
}
static void gen_sradi0(DisasContext *ctx)