From 8979c2f602357129fdf07a5cf8484ca430928b47 Mon Sep 17 00:00:00 2001 From: Tom Musta Date: Mon, 25 Aug 2014 14:25:40 -0500 Subject: target-ppc: Optimize rlwinm MB=0 ME=31 Optimize the special case of rlwinm where MB=0 and ME=31. This can be implemented as a 32-bit ROTL. Signed-off-by: Tom Musta Suggested-by: Richard Henderson Reviewed-by: Richard Henderson Signed-off-by: Alexander Graf --- target-ppc/translate.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'target-ppc/translate.c') diff --git a/target-ppc/translate.c b/target-ppc/translate.c index 095b83c147..889e37d272 100644 --- a/target-ppc/translate.c +++ b/target-ppc/translate.c @@ -1691,6 +1691,12 @@ static void gen_rlwinm(DisasContext *ctx) tcg_gen_shri_tl(t0, t0, mb); tcg_gen_ext32u_tl(cpu_gpr[rA(ctx->opcode)], t0); tcg_temp_free(t0); + } else if (likely(mb == 0 && me == 31)) { + TCGv_i32 t0 = tcg_temp_new_i32(); + tcg_gen_trunc_tl_i32(t0, cpu_gpr[rS(ctx->opcode)]); + tcg_gen_rotli_i32(t0, t0, sh); + tcg_gen_extu_i32_tl(cpu_gpr[rA(ctx->opcode)], t0); + tcg_temp_free_i32(t0); } else { TCGv t0 = tcg_temp_new(); #if defined(TARGET_PPC64) -- cgit v1.2.1