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target-arm: Handle always condition codes within arm_test_cc

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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>
This commit is contained in:
Richard Henderson 2015-09-14 14:39:47 +01:00 • committed by Peter Maydell
parent 6c2c63d3a0
commit 9305eac09e
1 changed files with 9 additions and 0 deletions
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9
target-arm/translate.c
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@ -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;