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softfloat: Fix BAD_SHIFT from normalizeFloatx80Subnormal
All other calls to normalize*Subnormal detect zero input before the call -- this is the only outlier. This case can happen with +0.0 + +0.0 = +0.0 or -0.0 + -0.0 = -0.0, so return a zero of the correct sign. Reported-by: Coverity (CID 1421991) Backports commit 2f311075b7a74124098effc72290767b02869561 from qemu
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@ -5818,6 +5818,9 @@ static floatx80 addFloatx80Sigs(floatx80 a, floatx80 b, flag zSign,
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zSig1 = 0;
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zSig0 = aSig + bSig;
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if ( aExp == 0 ) {
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if (zSig0 == 0) {
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return packFloatx80(zSign, 0, 0);
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}
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normalizeFloatx80Subnormal( zSig0, &zExp, &zSig0 );
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goto roundAndPack;
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}
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