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* [Bug math/31023] New: feupdateenv does not trigger traps for previously flagged floating-point exceptions on hppa
@ 2023-11-01 19:58 bruno at clisp dot org
2023-11-01 19:58 ` [Bug math/31023] " bruno at clisp dot org
2023-11-01 19:58 ` bruno at clisp dot org
0 siblings, 2 replies; 3+ messages in thread
From: bruno at clisp dot org @ 2023-11-01 19:58 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=31023
Bug ID: 31023
Summary: feupdateenv does not trigger traps for previously
flagged floating-point exceptions on hppa
Product: glibc
Version: 2.37
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: bruno at clisp dot org
Target Milestone: ---
Created attachment 15204
--> https://sourceware.org/bugzilla/attachment.cgi?id=15204&action=edit
test case foo.c
In ISO C 23 § 7.6.6.4 the standard says:
"The feupdateenv function attempts to save the currently raised floating-point
exceptions in its automatic storage, install the dynamic floating-point
environment represented by the object pointed to by envp, and then raise the
saved floating-point exceptions."
This works on all platforms, but not on hppa. (I'm using Debian 12 GNU/Linux
hppa).
How to reproduce: Compile and run the attached foo.c.
$ gcc -Wall foo.c -lm
$ ./a.out; echo $?
Expected result:
Floating point exception (core dumped)
or
Illegal instruction (core dumped)
Actual result:
0
The bug is in feupdateenv, because when I add a correct definition of
feupdateenv to the program, things work as expected:
$ gcc -Wall foo-corrected.c -lm
$ ./a.out; echo $?
Illegal instruction
132
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* [Bug math/31023] feupdateenv does not trigger traps for previously flagged floating-point exceptions on hppa
2023-11-01 19:58 [Bug math/31023] New: feupdateenv does not trigger traps for previously flagged floating-point exceptions on hppa bruno at clisp dot org
@ 2023-11-01 19:58 ` bruno at clisp dot org
2023-11-01 19:58 ` bruno at clisp dot org
1 sibling, 0 replies; 3+ messages in thread
From: bruno at clisp dot org @ 2023-11-01 19:58 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=31023
Bruno Haible <bruno at clisp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Host| |hppa-unknown-linux-gnu
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* [Bug math/31023] feupdateenv does not trigger traps for previously flagged floating-point exceptions on hppa
2023-11-01 19:58 [Bug math/31023] New: feupdateenv does not trigger traps for previously flagged floating-point exceptions on hppa bruno at clisp dot org
2023-11-01 19:58 ` [Bug math/31023] " bruno at clisp dot org
@ 2023-11-01 19:58 ` bruno at clisp dot org
1 sibling, 0 replies; 3+ messages in thread
From: bruno at clisp dot org @ 2023-11-01 19:58 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=31023
--- Comment #1 from Bruno Haible <bruno at clisp dot org> ---
Created attachment 15205
--> https://sourceware.org/bugzilla/attachment.cgi?id=15205&action=edit
test case with workaround
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2023-11-01 19:58 [Bug math/31023] New: feupdateenv does not trigger traps for previously flagged floating-point exceptions on hppa bruno at clisp dot org
2023-11-01 19:58 ` [Bug math/31023] " bruno at clisp dot org
2023-11-01 19:58 ` bruno at clisp dot org
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