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author | Richard Henderson <richard.henderson@linaro.org> | 2020-04-03 20:11:45 +0100 |
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committer | Alex Bennée <alex.bennee@linaro.org> | 2020-04-07 16:19:49 +0100 |
commit | 2f311075b7a74124098effc72290767b02869561 (patch) | |
tree | 1f4030db3d55cb7c3dffe2e034b3d5fb4060f920 /fpu | |
parent | 076b2fadb582e4734a879f843885dad38cf91526 (diff) | |
download | qemu-2f311075b7a74124098effc72290767b02869561.zip qemu-2f311075b7a74124098effc72290767b02869561.tar.gz qemu-2f311075b7a74124098effc72290767b02869561.tar.bz2 |
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)
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200327232042.10008-1-richard.henderson@linaro.org>
Message-Id: <20200403191150.863-8-alex.bennee@linaro.org>
Diffstat (limited to 'fpu')
-rw-r--r-- | fpu/softfloat.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 301ce3b..ae6ba71 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -5856,6 +5856,9 @@ static floatx80 addFloatx80Sigs(floatx80 a, floatx80 b, flag zSign, zSig1 = 0; zSig0 = aSig + bSig; if ( aExp == 0 ) { + if (zSig0 == 0) { + return packFloatx80(zSign, 0, 0); + } normalizeFloatx80Subnormal( zSig0, &zExp, &zSig0 ); goto roundAndPack; } |