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softfloat: Fix missing inexact for floating-point add 

For 0x1.0000000000003p+0 + 0x1.ffffffep+14 = 0x1.0001fffp+15
we dropped the sticky bit and so failed to raise inexact.

Reported-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Tested-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Message-id: 20180810193129.1556-7-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2018-08-16 14:05:29 +01:00 committed by Peter Maydell
parent b8a4a96db3
commit 64d450a0ea
1 changed files with 1 additions and 1 deletions
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2
fpu/softfloat.c
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@ -701,7 +701,7 @@ static FloatParts addsub_floats(FloatParts a, FloatParts b, bool subtract,
}
a.frac += b.frac;
if (a.frac & DECOMPOSED_OVERFLOW_BIT) {
a.frac >>= 1;
shift64RightJamming(a.frac, 1, &a.frac);
a.exp += 1;
}
return a;