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| author | Joseph Myers <joseph@codesourcery.com> | 2020-06-08 16:55:49 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-06-26 09:39:38 -0400 |
| commit | 499a2f7b554a295cfc10f8cd026d9b20a38fe664 (patch) | |
| tree | cac18ca24ffb0267bc7605651c3f691cdcfe5f40 | |
| parent | 6b8b0136ab3018e4b552b485f808bf66bcf19ead (diff) | |
| download | qemu-499a2f7b554a295cfc10f8cd026d9b20a38fe664.zip | |
softfloat: fix floatx80 remainder pseudo-denormal check for zero
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.
Signed-off-by: Joseph Myers <joseph@codesourcery.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <alpine.DEB.2.21.2006081655180.23637@digraph.polyomino.org.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | fpu/softfloat.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c index b7dcf4d6c3..f164b5c0ad 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -5741,7 +5741,7 @@ 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); |