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target-s390x: optimize (negative-) abs computation

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Now that movcond exists, it's easy to write (negative-) absolute value
using TCG code instead of an helper.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Aurelien Jarno 2015-05-18 15:39:59 +02:00 • committed by Alexander Graf
parent 2aaa194068
commit d30107814c
3 changed files with 14 additions and 26 deletions
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16
target-s390x/translate.c
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@ -1310,7 +1310,13 @@ static ExitStatus help_branch(DisasContext *s, DisasCompare *c,
static ExitStatus op_abs(DisasContext *s, DisasOps *o)
{
gen_helper_abs_i64(o->out, o->in2);
TCGv_i64 z, n;
z = tcg_const_i64(0);
n = tcg_temp_new_i64();
tcg_gen_neg_i64(n, o->in2);
tcg_gen_movcond_i64(TCG_COND_LT, o->out, o->in2, z, n, o->in2);
tcg_temp_free_i64(n);
tcg_temp_free_i64(z);
return NO_EXIT;
}
@ -2680,7 +2686,13 @@ static ExitStatus op_msdb(DisasContext *s, DisasOps *o)
static ExitStatus op_nabs(DisasContext *s, DisasOps *o)
{
gen_helper_nabs_i64(o->out, o->in2);
TCGv_i64 z, n;
z = tcg_const_i64(0);
n = tcg_temp_new_i64();
tcg_gen_neg_i64(n, o->in2);
tcg_gen_movcond_i64(TCG_COND_GE, o->out, o->in2, z, n, o->in2);
tcg_temp_free_i64(n);
tcg_temp_free_i64(z);
return NO_EXIT;
}