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| author | Joseph Myers <joseph@codesourcery.com> | 2016-01-19 21:42:58 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2016-01-19 21:42:58 +0000 |
| commit | 2e3d0de31f2020fbf358b932db18b8c44e2c92d0 (patch) | |
| tree | 6eb794364583af8bde33a78e47ac0d8311b1194e /math | |
| parent | df782dc690775d93b0cc1076655a9b92b5a44ad0 (diff) | |
| download | glibc-2e3d0de31f2020fbf358b932db18b8c44e2c92d0.tar.gz | |
Fix ulps regeneration for *-finite tests.
On running tests after from-scratch ulps regeneration, I found that
some libm tests failed with ulps in excess of those recorded in the
from-scratch regeneration, which should never happen unless those ulps
exceed the limit on ulps that can go in libm-test-ulps files.
Failure: Test: atan2_upward (inf, -inf)
Result:
is: 2.35619498e+00 0x1.2d97ccp+1
should be: 2.35619450e+00 0x1.2d97c8p+1
difference: 4.76837159e-07 0x1.000000p-21
ulp : 2.0000
max.ulp : 1.0000
Maximal error of `atan2_upward'
is : 2 ulp
accepted: 1 ulp
Failure: Test: carg_upward (-inf + inf i)
Result:
is: 2.35619498e+00 0x1.2d97ccp+1
should be: 2.35619450e+00 0x1.2d97c8p+1
difference: 4.76837159e-07 0x1.000000p-21
ulp : 2.0000
max.ulp : 1.0000
Maximal error of `carg_upward'
is : 2 ulp
accepted: 1 ulp
The problem comes from the addition of tests for the finite-math-only
versions of libm functions. Those tests share ulps with the default
function variants. make regen-ulps runs the default tests before the
finite-math-only tests, concatenating the resulting ulps before
feeding them to gen-libm-test.pl to generate a new libm-test-ulps
file. But gen-libm-test.pl always takes the last ulps value given for
any (function, type) pair. So, if the largest ulps for a function
come from non-finite inputs, a from-scratch regeneration loses those
ulps.
This patch fixes gen-libm-test.pl, in the case where there are
multiple ulps values for a (function, type) pair - which can only
happen as part of a regeneration - to take the largest ulps value
rather than the last one.
Tested for ARM / MIPS / powerpc-nofpu.
* math/gen-libm-test.pl (parse_ulps): Do not reduce
already-recorded ulps.
* sysdeps/arm/libm-test-ulps: Regenerated.
* sysdeps/mips/mips32/libm-test-ulps: Likewise.
* sysdeps/mips/mips64/libm-test-ulps: Likewise.
* sysdeps/powerpc/nofpu/libm-test-ulps: Likewise.
Diffstat (limited to 'math')
| -rwxr-xr-x | math/gen-libm-test.pl | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/math/gen-libm-test.pl b/math/gen-libm-test.pl index eb1c29956d..17f17f7493 100755 --- a/math/gen-libm-test.pl +++ b/math/gen-libm-test.pl @@ -583,8 +583,11 @@ sub parse_ulps { # ignore next; } else { - $results{$test}{$type}{'ulp'}{$float} = $eps; - $results{$test}{'has_ulps'} = 1; + if (!defined ($results{$test}{$type}{'ulp'}{$float}) + || $results{$test}{$type}{'ulp'}{$float} < $eps) { + $results{$test}{$type}{'ulp'}{$float} = $eps; + $results{$test}{'has_ulps'} = 1; + } } if ($type =~ /^real|imag$/) { $results{$test}{'type'} = 'complex'; |