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s390x/tcg: Handle all rounding modes overwritten by BFP instructions

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"round to nearest with ties away from 0" maps to float_round_ties_away.
"round to prepare for shorter precision" maps to float_round_to_odd.

As all instructions properly check for valid rounding modes in translate.c
we can add an assert. Fix one missing empty line.

Cc: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20190218122710.23639-15-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2019-02-18 13:27:09 +01:00 committed by Cornelia Huck
parent bdcfcd445d
commit b12b103ecd
1 changed files with 11 additions and 2 deletions
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13
target/s390x/fpu_helper.c
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@ -397,14 +397,21 @@ uint32_t HELPER(cxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
int s390_swap_bfp_rounding_mode(CPUS390XState *env, int m3)
{
int ret = env->fpu_status.float_rounding_mode;
switch (m3) {
case 0:
/* current mode */
break;
case 1:
/* biased round no nearest */
/* round to nearest with ties away from 0 */
set_float_rounding_mode(float_round_ties_away, &env->fpu_status);
break;
case 3:
/* round to prepare for shorter precision */
set_float_rounding_mode(float_round_to_odd, &env->fpu_status);
break;
case 4:
/* round to nearest */
/* round to nearest with ties to even */
set_float_rounding_mode(float_round_nearest_even, &env->fpu_status);
break;
case 5:
@ -419,6 +426,8 @@ int s390_swap_bfp_rounding_mode(CPUS390XState *env, int m3)
/* round to -inf */
set_float_rounding_mode(float_round_down, &env->fpu_status);
break;
default:
g_assert_not_reached();
}
return ret;
}