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target/s390x: Fix the floating-point multiply-and-add NaN rules

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Order the helper arguments to match the Principles of Operation.
Implement the "Results: MULTIPLY AND ADD" table in pickNaNMulAdd().

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-ID: <20241023000147.34035-2-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Ilya Leoshkevich 2024-10-23 01:59:18 +02:00 • committed by Thomas Huth
parent 80c80346eb
commit e1f1ccb8f0
3 changed files with 29 additions and 10 deletions
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19
fpu/softfloat-specialize.c.inc
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@ -597,6 +597,25 @@ static int pickNaNMulAdd(FloatClass a_cls, FloatClass b_cls, FloatClass c_cls,
float_raise(float_flag_invalid | float_flag_invalid_imz, status);
}
return 3; /* default NaN */
#elif defined(TARGET_S390X)
if (infzero) {
float_raise(float_flag_invalid | float_flag_invalid_imz, status);
return 3;
}
if (is_snan(a_cls)) {
return 0;
} else if (is_snan(b_cls)) {
return 1;
} else if (is_snan(c_cls)) {
return 2;
} else if (is_qnan(a_cls)) {
return 0;
} else if (is_qnan(b_cls)) {
return 1;
} else {
return 2;
}
#elif defined(TARGET_SPARC)
/* For (inf,0,nan) return c. */
if (infzero) {