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| author | Joseph Myers <joseph@codesourcery.com> | 2015-02-25 00:01:15 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-02-25 00:01:15 +0000 |
| commit | 440169d681cc9f422e8486f1324079bef0e0c35a (patch) | |
| tree | 9b732f618ba081518cf0cca84ef33328526a4633 /math/auto-libm-test-in | |
| parent | ba7d2c543f7d69883ece7eab39bf6c5cd5dc3081 (diff) | |
| download | glibc-440169d681cc9f422e8486f1324079bef0e0c35a.tar glibc-440169d681cc9f422e8486f1324079bef0e0c35a.tar.gz glibc-440169d681cc9f422e8486f1324079bef0e0c35a.tar.bz2 glibc-440169d681cc9f422e8486f1324079bef0e0c35a.zip | |
Fix ldbl-128ibm acoshl inaccuracy (bug 18019).
The ldbl-128ibm implementation of acoshl uses a cut-off of 0x1p28 to
determine when to use log(x) + log(2) as a formula. That cut-off is
too small for this format, resulting in large errors. This patch
changes it to a more appropriate cut-off of 0x1p56, adding tests
around the cut-offs for various floating-point formats.
Tested for powerpc. Also tested for x86_64 and x86 and updated ulps.
[BZ #18019]
* sysdeps/ieee754/ldbl-128ibm/e_acoshl.c (__ieee754_acoshl): Use
2**56 not 2**28 as threshold for log (2x) formula.
* math/auto-libm-test-in: Add more tests of acosh.
* math/auto-libm-test-out: Regenerated.
* sysdeps/i386/fpu/libm-test-ulps: Update.
* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
Diffstat (limited to 'math/auto-libm-test-in')
| -rw-r--r-- | math/auto-libm-test-in | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/math/auto-libm-test-in b/math/auto-libm-test-in index 62e1439c02..a4bd972c80 100644 --- a/math/auto-libm-test-in +++ b/math/auto-libm-test-in @@ -43,6 +43,37 @@ acosh 1.625 acosh 7 acosh 100 acosh 1e5 +acosh 0x1p8 +acosh 0x1p9 +acosh 0x1p10 +acosh 0x1p11 +acosh 0x1p12 +acosh 0x1p13 +acosh 0x1p24 +acosh 0x1p25 +acosh 0x1p26 +acosh 0x1p27 +acosh 0x1p28 +acosh 0x1p29 +acosh 0x1p30 +acosh 0x1p31 +acosh 0x1p32 +acosh 0x1p33 +acosh 0x1p48 +acosh 0x1p49 +acosh 0x1p50 +acosh 0x1p51 +acosh 0x1p52 +acosh 0x1p53 +acosh 0x1p54 +acosh 0x1p55 +acosh 0x1p56 +acosh 0x1p57 +acosh 0x1p58 +acosh 0x1p59 +acosh 0x1p100 +acosh 0x1p500 +acosh 0x1p5000 acosh max no-test-inline asin 0 |