From d0f44a55fa321e042bd6b2a0fa25ac48864b7a25 Mon Sep 17 00:00:00 2001 From: Aurelien Jarno Date: Mon, 25 May 2015 01:28:56 +0200 Subject: target-sh4: optimize subc using sub2 Reviewed-by: Richard Henderson Signed-off-by: Aurelien Jarno --- target-sh4/translate.c | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) (limited to 'target-sh4/translate.c') diff --git a/target-sh4/translate.c b/target-sh4/translate.c index 5c90fe3..b8abfd5 100644 --- a/target-sh4/translate.c +++ b/target-sh4/translate.c @@ -880,19 +880,15 @@ static void _decode_opc(DisasContext * ctx) return; case 0x300a: /* subc Rm,Rn */ { - TCGv t0, t1, t2; - t0 = tcg_temp_new(); + TCGv t0, t1; + t0 = tcg_const_tl(0); t1 = tcg_temp_new(); - tcg_gen_sub_i32(t1, REG(B11_8), REG(B7_4)); - tcg_gen_sub_i32(t0, t1, cpu_sr_t); - t2 = tcg_temp_new(); - tcg_gen_setcond_i32(TCG_COND_LTU, t2, REG(B11_8), t1); - tcg_gen_setcond_i32(TCG_COND_LTU, t1, t1, t0); - tcg_gen_or_i32(cpu_sr_t, t1, t2); - tcg_temp_free(t2); - tcg_temp_free(t1); - tcg_gen_mov_i32(REG(B11_8), t0); + tcg_gen_add2_i32(t1, cpu_sr_t, cpu_sr_t, t0, REG(B7_4), t0); + tcg_gen_sub2_i32(REG(B11_8), cpu_sr_t, + REG(B11_8), t0, t1, cpu_sr_t); + tcg_gen_andi_i32(cpu_sr_t, cpu_sr_t, 1); tcg_temp_free(t0); + tcg_temp_free(t1); } return; case 0x300b: /* subv Rm,Rn */ -- cgit v1.1