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softfloat: Handle float_muladd_negate_c when product is zero 

Honour float_muladd_negate_c in the case where the product is zero and
c is nonzero.  Previously we would fail to negate c.

Seen in (and tested against) the gfortran testsuite on MIPS.

Signed-off-by: Richard Sandiford <rdsandiford@googlemail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Richard Sandiford 2013-01-22 17:03:05 +00:00 committed by Blue Swirl
parent de16017dc8
commit a6e7c18476
1 changed files with 2 additions and 2 deletions
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4
fpu/softfloat.c
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@ -2234,7 +2234,7 @@ float32 float32_muladd(float32 a, float32 b, float32 c, int flags STATUS_PARAM)
}
}
/* Zero plus something non-zero : just return the something */
return make_float32(float32_val(c) ^ (signflip << 31));
return packFloat32(cSign ^ signflip, cExp, cSig);
}
if (aExp == 0) {
@ -3787,7 +3787,7 @@ float64 float64_muladd(float64 a, float64 b, float64 c, int flags STATUS_PARAM)
}
}
/* Zero plus something non-zero : just return the something */
return make_float64(float64_val(c) ^ ((uint64_t)signflip << 63));
return packFloat64(cSign ^ signflip, cExp, cSig);
}
if (aExp == 0) {