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softfloat: Pass have_snan to pickNaNMulAdd

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The new implementation of pickNaNMulAdd() will find it convenient
to know whether at least one of the three arguments to the muladd
was a signaling NaN. We already calculate that in the caller,
so pass it in as a new bool have_snan.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241202131347.498124-15-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2024-12-11 15:30:57 +00:00
parent 2bf5629c97
commit d62c734d52
2 changed files with 4 additions and 3 deletions
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5
fpu/softfloat-parts.c.inc
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@ -67,8 +67,9 @@ static FloatPartsN *partsN(pick_nan_muladd)(FloatPartsN *a, FloatPartsN *b,
{ {
int which; int which;
bool infzero = (ab_mask == float_cmask_infzero); bool infzero = (ab_mask == float_cmask_infzero);
bool have_snan = (abc_mask & float_cmask_snan);
if (unlikely(abc_mask & float_cmask_snan)) { if (unlikely(have_snan)) {
float_raise(float_flag_invalid | float_flag_invalid_snan, s); float_raise(float_flag_invalid | float_flag_invalid_snan, s);
} }
@ -80,7 +81,7 @@ static FloatPartsN *partsN(pick_nan_muladd)(FloatPartsN *a, FloatPartsN *b,
if (s->default_nan_mode) { if (s->default_nan_mode) {
which = 3; which = 3;
} else { } else {
which = pickNaNMulAdd(a->cls, b->cls, c->cls, infzero, s); which = pickNaNMulAdd(a->cls, b->cls, c->cls, infzero, have_snan, s);
} }
if (which == 3) { if (which == 3) {

2
fpu/softfloat-specialize.c.inc
View File

@ -473,7 +473,7 @@ static int pickNaN(FloatClass a_cls, FloatClass b_cls,
| Return values : 0 : a; 1 : b; 2 : c; 3 : default-NaN | Return values : 0 : a; 1 : b; 2 : c; 3 : default-NaN
*----------------------------------------------------------------------------*/ *----------------------------------------------------------------------------*/
static int pickNaNMulAdd(FloatClass a_cls, FloatClass b_cls, FloatClass c_cls, static int pickNaNMulAdd(FloatClass a_cls, FloatClass b_cls, FloatClass c_cls,
bool infzero, float_status *status) bool infzero, bool have_snan, float_status *status)
{ {
/* /*
* We guarantee not to require the target to tell us how to * We guarantee not to require the target to tell us how to