yuzu/unicorn
1
0
Fork 0
mirror of https://github.com/yuzu-emu/unicorn.git synced 2025-11-04 14:14:57 +00:00
Code Issues Packages Projects Releases Wiki Activity

softfloat: fix floatx80 remainder pseudo-denormal check for zero

Browse source 
The floatx80 remainder implementation ignores the high bit of the
significand when checking whether an operand (numerator) with zero
exponent is zero. This means it mishandles a pseudo-denormal
representation of 0x1p-16382L by treating it as zero. Fix this by
checking the whole significand instead.

Backports commit 499a2f7b554a295cfc10f8cd026d9b20a38fe664 from qemu
This commit is contained in:
Joseph Myers 2021-02-25 13:35:16 -05:00 committed by Lioncash
parent b08d204a37
commit 6b63555a00
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
qemu/fpu/softfloat.c
View file

@ -5703,7 +5703,7 @@ floatx80 floatx80_modrem(floatx80 a, floatx80 b, bool mod,
normalizeFloatx80Subnormal( bSig, &bExp, &bSig );
}
if ( aExp == 0 ) {
if ( (uint64_t) ( aSig0<<1 ) == 0 ) return a;
if ( aSig0 == 0 ) return a;
normalizeFloatx80Subnormal( aSig0, &aExp, &aSig0 );
}
bSig |= UINT64_C(0x8000000000000000);