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| author | Joseph Myers <joseph@codesourcery.com> | 2016-02-19 00:55:46 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2016-02-19 00:55:46 +0000 |
| commit | 9120a57f4819965fa976d5de3b1d27b284319ed1 (patch) | |
| tree | 3b5cc8cad1e09a47f23d9072009fb8545de34cfd /sysdeps/ieee754/ldbl-128ibm/s_remquol.c | |
| parent | 0fed79a8279bb4d4483895a742457946faf89594 (diff) | |
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Fix ldbl-128ibm remainderl, remquol equality tests (bug 19603).
The ldbl-128ibm implementations of remainderl and remquol have logic
resulting in incorrect tests for equality of the absolute values of
the arguments. Equality is tested based on the integer
representations of the high and low parts, with the sign bit masked
off the high part - but when this changes the sign of the high part,
the sign of the low part needs to be changed as well, and failure to
do this means arguments are wrongly treated as equal when they are
not.
This patch fixes the logic to adjust signs of low parts as needed.
Tested for powerpc.
[BZ #19603]
* sysdeps/ieee754/ldbl-128ibm/e_remainderl.c
(__ieee754_remainderl): Adjust sign of integer version of low part
when taking absolute value of high part.
* sysdeps/ieee754/ldbl-128ibm/s_remquol.c (__remquol): Likewise.
* math/libm-test.inc (remainder_test_data): Add another test.
(remquo_test_data): Likewise.
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/s_remquol.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_remquol.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_remquol.c b/sysdeps/ieee754/ldbl-128ibm/s_remquol.c index 20e17cc823..14b27ca616 100644 --- a/sysdeps/ieee754/ldbl-128ibm/s_remquol.c +++ b/sysdeps/ieee754/ldbl-128ibm/s_remquol.c @@ -43,7 +43,9 @@ __remquol (long double x, long double y, int *quo) EXTRACT_WORDS64 (ly, ylo); sx = hx & 0x8000000000000000ULL; qs = sx ^ (hy & 0x8000000000000000ULL); + ly ^= hy & 0x8000000000000000ULL; hy &= 0x7fffffffffffffffLL; + lx ^= sx; hx &= 0x7fffffffffffffffLL; /* Purge off exception values. */ |