target-ppc: Optimize rlwnm MB=0 ME=31
Optimize the special case of rlwnm where MB=0 and ME=31. This can be implemented using a ROTL. Suggested-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Tom Musta <tommusta@gmail.com> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
parent
8979c2f602
commit
57fca134bb
@ -1721,37 +1721,49 @@ static void gen_rlwinm(DisasContext *ctx)
|
||||
static void gen_rlwnm(DisasContext *ctx)
|
||||
{
|
||||
uint32_t mb, me;
|
||||
TCGv t0;
|
||||
#if defined(TARGET_PPC64)
|
||||
TCGv t1;
|
||||
#endif
|
||||
|
||||
mb = MB(ctx->opcode);
|
||||
me = ME(ctx->opcode);
|
||||
t0 = tcg_temp_new();
|
||||
tcg_gen_andi_tl(t0, cpu_gpr[rB(ctx->opcode)], 0x1f);
|
||||
#if defined(TARGET_PPC64)
|
||||
t1 = tcg_temp_new_i64();
|
||||
tcg_gen_deposit_i64(t1, cpu_gpr[rS(ctx->opcode)],
|
||||
cpu_gpr[rS(ctx->opcode)], 32, 32);
|
||||
tcg_gen_rotl_i64(t0, t1, t0);
|
||||
tcg_temp_free_i64(t1);
|
||||
#else
|
||||
tcg_gen_rotl_i32(t0, cpu_gpr[rS(ctx->opcode)], t0);
|
||||
#endif
|
||||
if (unlikely(mb != 0 || me != 31)) {
|
||||
#if defined(TARGET_PPC64)
|
||||
mb += 32;
|
||||
me += 32;
|
||||
#endif
|
||||
tcg_gen_andi_tl(cpu_gpr[rA(ctx->opcode)], t0, MASK(mb, me));
|
||||
|
||||
if (likely(mb == 0 && me == 31)) {
|
||||
TCGv_i32 t0, t1;
|
||||
t0 = tcg_temp_new_i32();
|
||||
t1 = tcg_temp_new_i32();
|
||||
tcg_gen_trunc_tl_i32(t0, cpu_gpr[rB(ctx->opcode)]);
|
||||
tcg_gen_trunc_tl_i32(t1, cpu_gpr[rS(ctx->opcode)]);
|
||||
tcg_gen_andi_i32(t0, t0, 0x1f);
|
||||
tcg_gen_rotl_i32(t1, t1, t0);
|
||||
tcg_gen_extu_i32_tl(cpu_gpr[rA(ctx->opcode)], t1);
|
||||
tcg_temp_free_i32(t0);
|
||||
tcg_temp_free_i32(t1);
|
||||
} else {
|
||||
TCGv t0;
|
||||
#if defined(TARGET_PPC64)
|
||||
tcg_gen_andi_tl(t0, t0, MASK(32, 63));
|
||||
TCGv t1;
|
||||
#endif
|
||||
tcg_gen_mov_tl(cpu_gpr[rA(ctx->opcode)], t0);
|
||||
|
||||
t0 = tcg_temp_new();
|
||||
tcg_gen_andi_tl(t0, cpu_gpr[rB(ctx->opcode)], 0x1f);
|
||||
#if defined(TARGET_PPC64)
|
||||
t1 = tcg_temp_new_i64();
|
||||
tcg_gen_deposit_i64(t1, cpu_gpr[rS(ctx->opcode)],
|
||||
cpu_gpr[rS(ctx->opcode)], 32, 32);
|
||||
tcg_gen_rotl_i64(t0, t1, t0);
|
||||
tcg_temp_free_i64(t1);
|
||||
#else
|
||||
tcg_gen_rotl_i32(t0, cpu_gpr[rS(ctx->opcode)], t0);
|
||||
#endif
|
||||
if (unlikely(mb != 0 || me != 31)) {
|
||||
#if defined(TARGET_PPC64)
|
||||
mb += 32;
|
||||
me += 32;
|
||||
#endif
|
||||
tcg_gen_andi_tl(cpu_gpr[rA(ctx->opcode)], t0, MASK(mb, me));
|
||||
} else {
|
||||
tcg_gen_andi_tl(t0, t0, MASK(32, 63));
|
||||
tcg_gen_mov_tl(cpu_gpr[rA(ctx->opcode)], t0);
|
||||
}
|
||||
tcg_temp_free(t0);
|
||||
}
|
||||
tcg_temp_free(t0);
|
||||
if (unlikely(Rc(ctx->opcode) != 0))
|
||||
gen_set_Rc0(ctx, cpu_gpr[rA(ctx->opcode)]);
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user