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| author | Joseph Myers <joseph@codesourcery.com> | 2015-06-21 17:48:04 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-06-21 17:48:04 +0000 |
| commit | 7540cfc5a8c39eca9ba7b631dd30b35f6530f54d (patch) | |
| tree | c24b888cf113ef3ec9a6e55ad495a1917c6e57bb /math/auto-libm-test-in | |
| parent | d6cc0b4feaacf7514167cde0b3935f0c9b2c2d88 (diff) | |
| download | glibc-7540cfc5a8c39eca9ba7b631dd30b35f6530f54d.zip glibc-7540cfc5a8c39eca9ba7b631dd30b35f6530f54d.tar.gz glibc-7540cfc5a8c39eca9ba7b631dd30b35f6530f54d.tar.bz2 | |
Fix x86 / x86_64 expl, exp10l missing underflows (bug 16361).
Similar to various other bugs in this area, the x86 and x86_64
implementations of expl / exp10l can fail to produce underflow
exceptions when the unscaled result has trailing 0 bits so the scaling
down to subnormal precision is exact. This patch fixes this by
forcing the exception in the case of tiny results.
Tested for x86_64 and x86.
[BZ #16361]
* sysdeps/i386/fpu/e_expl.S [!USE_AS_EXPM1L] (cmin): New object.
[!USE_AS_EXPM1L] (IEEE754_EXPL): Force underflow exception for
tiny results.
* sysdeps/x86_64/fpu/e_expl.S [!USE_AS_EXPM1L] (cmin): New object.
[!USE_AS_EXPM1L] (IEEE754_EXPL): Force underflow exception for
tiny results.
* math/auto-libm-test-in: Add more tests of exp and exp10. Do not
mark underflow exceptions as possibly missing for bug 16361.
* math/auto-libm-test-out: Regenerated.
Diffstat (limited to 'math/auto-libm-test-in')
| -rw-r--r-- | math/auto-libm-test-in | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/math/auto-libm-test-in b/math/auto-libm-test-in index 6ec4bc6..e8e4da6 100644 --- a/math/auto-libm-test-in +++ b/math/auto-libm-test-in @@ -1191,6 +1191,7 @@ exp -7.4444006192138124e+02 exp -0x1.75f113c30b1c8p+9 exp -max exp -11342.8125 +exp -0x2.c5b2319c4843acc0p12 exp 0x1p-10 exp -0x1p-10 exp 0x1p-20 @@ -1223,8 +1224,8 @@ exp10 305 exp10 -305 # GCC bug 59666: results on directed rounding may be incorrect. exp10 4932 xfail-rounding:ldbl-128ibm -# Bug 16361: underflow exception may be misssing -exp10 -4932 missing-underflow:ldbl-96-intel:x86 missing-underflow:ldbl-96-intel:x86_64 +exp10 -4932 +exp10 -0x1.343793004f503232p12 # GCC bug 59666: results on directed rounding may be incorrect. exp10 1e5 xfail-rounding:ldbl-128ibm exp10 -1e5 |