commit 9305eac09e61d857c9cc11e20db754dfc25a82db
author Richard Henderson <rth@twiddle.net> Mon Sep 14 14:39:47 2015 +0100
committer Peter Maydell <peter.maydell@linaro.org> Mon Sep 14 14:39:47 2015 +0100
tree 043042dca1b456bf88354dd8e4cf4bf61fd82bbc
parent 6c2c63d3a02c79e9035ca0370cc549d0f938a4dd

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 <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-id: 1441909103-24666-4-git-send-email-rth@twiddle.net
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target-arm/translate.c

diff --git a/target-arm/translate.c b/target-arm/translate.c
index 7d2e984..84a21ac 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -804,6 +804,14 @@
         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 @@
         cond = tcg_invert_cond(cond);
     }
 
+ no_invert:
     cmp->cond = cond;
     cmp->value = value;
     cmp->value_global = global;