aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorRichard Henderson <richard.henderson@linaro.org>2020-04-03 20:11:45 +0100
committerAlex Bennée <alex.bennee@linaro.org>2020-04-07 16:19:49 +0100
commit2f311075b7a74124098effc72290767b02869561 (patch)
tree1f4030db3d55cb7c3dffe2e034b3d5fb4060f920
parent076b2fadb582e4734a879f843885dad38cf91526 (diff)
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>
-rw-r--r--fpu/softfloat.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 301ce3b537..ae6ba71854 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;
}