From 9305eac09e61d857c9cc11e20db754dfc25a82db Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Mon, 14 Sep 2015 14:39:47 +0100 Subject: [PATCH] target-arm: Handle always condition codes within arm_test_cc Handling this with TCG_COND_ALWAYS will allow these unlikely cases to be handled without special cases in the rest of the translator. The TCG optimizer ought to be able to reduce these ALWAYS conditions completely. Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson Message-id: 1441909103-24666-4-git-send-email-rth@twiddle.net Signed-off-by: Peter Maydell --- target-arm/translate.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/target-arm/translate.c b/target-arm/translate.c index 7d2e9848c4..84a21ace54 100644 --- a/target-arm/translate.c +++ b/target-arm/translate.c @@ -804,6 +804,14 @@ void arm_test_cc(DisasCompare *cmp, int cc) tcg_gen_andc_i32(value, cpu_ZF, value); break; + case 14: /* always */ + case 15: /* always */ + /* Use the ALWAYS condition, which will fold early. + * It doesn't matter what we use for the value. */ + cond = TCG_COND_ALWAYS; + value = cpu_ZF; + goto no_invert; + default: fprintf(stderr, "Bad condition code 0x%x\n", cc); abort(); @@ -813,6 +821,7 @@ void arm_test_cc(DisasCompare *cmp, int cc) cond = tcg_invert_cond(cond); } + no_invert: cmp->cond = cond; cmp->value = value; cmp->value_global = global; -- 2.11.0