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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.

Backports commit 9305eac09e61d857c9cc11e20db754dfc25a82db from qemu
This commit is contained in:
Richard Henderson 2018-02-10 23:47:13 -05:00 committed by Lioncash
parent 94f1227f7a
commit 70dd48b855
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 9 additions and 0 deletions
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9
qemu/target-arm/translate.c
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@ -802,6 +802,14 @@ void arm_test_cc(TCGContext *tcg_ctx, DisasCompare *cmp, int cc)
tcg_gen_andc_i32(tcg_ctx, value, tcg_ctx->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 = tcg_ctx->cpu_ZF;
goto no_invert;
default:
fprintf(stderr, "Bad condition code 0x%x\n", cc);
abort();
@ -811,6 +819,7 @@ void arm_test_cc(TCGContext *tcg_ctx, DisasCompare *cmp, int cc)
cond = tcg_invert_cond(cond);
}
no_invert:
cmp->cond = cond;
cmp->value = value;
cmp->value_global = global;