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* [Bug math/26983] New: [x86_64] x86_64 tgamma has too large ULP error
@ 2020-11-30 10:33 zimmerma+gcc at loria dot fr
2020-12-01 23:51 ` [Bug math/26983] " woodard at redhat dot com
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: zimmerma+gcc at loria dot fr @ 2020-11-30 10:33 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26983
Bug ID: 26983
Summary: [x86_64] x86_64 tgamma has too large ULP error
Product: glibc
Version: 2.32
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: zimmerma+gcc at loria dot fr
CC: joseph at codesourcery dot com
Target Milestone: ---
$ cat test2.c
#include <stdio.h>
#include <math.h>
int main()
{
double x = -0x1.62c4d519e8677p+3, y;
y = tgamma (x);
printf ("x=%a y=%a\n", x, y);
}
$ gcc -fno-builtin test2.c -lm
$ ./a.out
x=-0x1.62c4d519e8677p+3 y=0x1.fd63c481c16c9p-23
The correctly rounded result is 0x1.fd63c481c16bfp-23, which is 10 ulps apart.
This is larger than the maximum accepted error (9 ulps).
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* [Bug math/26983] [x86_64] x86_64 tgamma has too large ULP error
2020-11-30 10:33 [Bug math/26983] New: [x86_64] x86_64 tgamma has too large ULP error zimmerma+gcc at loria dot fr
@ 2020-12-01 23:51 ` woodard at redhat dot com
2020-12-07 10:32 ` zimmerma+gcc at loria dot fr
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: woodard at redhat dot com @ 2020-12-01 23:51 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26983
Ben Woodard <woodard at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |woodard at redhat dot com
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* [Bug math/26983] [x86_64] x86_64 tgamma has too large ULP error
2020-11-30 10:33 [Bug math/26983] New: [x86_64] x86_64 tgamma has too large ULP error zimmerma+gcc at loria dot fr
2020-12-01 23:51 ` [Bug math/26983] " woodard at redhat dot com
@ 2020-12-07 10:32 ` zimmerma+gcc at loria dot fr
2021-04-07 11:33 ` zimmerma+gcc at loria dot fr
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: zimmerma+gcc at loria dot fr @ 2020-12-07 10:32 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26983
--- Comment #1 from Paul Zimmermann <zimmerma+gcc at loria dot fr> ---
I also get an error of 10.1539 ulps for the following binary128 input with
glibc 2.32:
x=-0xf.01a777b2a80518082d6eae96ef98p+0
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* [Bug math/26983] [x86_64] x86_64 tgamma has too large ULP error
2020-11-30 10:33 [Bug math/26983] New: [x86_64] x86_64 tgamma has too large ULP error zimmerma+gcc at loria dot fr
2020-12-01 23:51 ` [Bug math/26983] " woodard at redhat dot com
2020-12-07 10:32 ` zimmerma+gcc at loria dot fr
@ 2021-04-07 11:33 ` zimmerma+gcc at loria dot fr
2021-04-07 11:34 ` zimmerma+gcc at loria dot fr
2021-04-07 11:43 ` zimmerma+gcc at loria dot fr
4 siblings, 0 replies; 6+ messages in thread
From: zimmerma+gcc at loria dot fr @ 2021-04-07 11:33 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26983
--- Comment #2 from Paul Zimmermann <zimmerma+gcc at loria dot fr> ---
and an error of 9.55 ulps (rounding to nearest) for the following long double
input (thus 10 ulps from the correctly rounded value):
x=-0xb.161d242d4b9282ap+0l
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* [Bug math/26983] [x86_64] x86_64 tgamma has too large ULP error
2020-11-30 10:33 [Bug math/26983] New: [x86_64] x86_64 tgamma has too large ULP error zimmerma+gcc at loria dot fr
` (2 preceding siblings ...)
2021-04-07 11:33 ` zimmerma+gcc at loria dot fr
@ 2021-04-07 11:34 ` zimmerma+gcc at loria dot fr
2021-04-07 11:43 ` zimmerma+gcc at loria dot fr
4 siblings, 0 replies; 6+ messages in thread
From: zimmerma+gcc at loria dot fr @ 2021-04-07 11:34 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26983
--- Comment #3 from Paul Zimmermann <zimmerma+gcc at loria dot fr> ---
the binary64 case is fixed by commit 43576de (at least for all known cases with
errors larger than 9 ulps)
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* [Bug math/26983] [x86_64] x86_64 tgamma has too large ULP error
2020-11-30 10:33 [Bug math/26983] New: [x86_64] x86_64 tgamma has too large ULP error zimmerma+gcc at loria dot fr
` (3 preceding siblings ...)
2021-04-07 11:34 ` zimmerma+gcc at loria dot fr
@ 2021-04-07 11:43 ` zimmerma+gcc at loria dot fr
4 siblings, 0 replies; 6+ messages in thread
From: zimmerma+gcc at loria dot fr @ 2021-04-07 11:43 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26983
Paul Zimmermann <zimmerma+gcc at loria dot fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|UNCONFIRMED |RESOLVED
Target Milestone|--- |2.34
--- Comment #4 from Paul Zimmermann <zimmerma+gcc at loria dot fr> ---
cases for ldbl-96 and float128 have been moved to #27707
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end of thread, other threads:[~2021-04-07 11:43 UTC | newest]
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2020-11-30 10:33 [Bug math/26983] New: [x86_64] x86_64 tgamma has too large ULP error zimmerma+gcc at loria dot fr
2020-12-01 23:51 ` [Bug math/26983] " woodard at redhat dot com
2020-12-07 10:32 ` zimmerma+gcc at loria dot fr
2021-04-07 11:33 ` zimmerma+gcc at loria dot fr
2021-04-07 11:34 ` zimmerma+gcc at loria dot fr
2021-04-07 11:43 ` zimmerma+gcc at loria dot fr
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