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* [Bug libc/27901] New: TEST_STACK_ALIGN doesn't work
@ 2021-05-23 15:55 hjl.tools at gmail dot com
2021-05-24 14:45 ` [Bug libc/27901] " hjl.tools at gmail dot com
0 siblings, 1 reply; 2+ messages in thread
From: hjl.tools at gmail dot com @ 2021-05-23 15:55 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=27901
Bug ID: 27901
Summary: TEST_STACK_ALIGN doesn't work
Product: glibc
Version: 2.34
Status: NEW
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
CC: drepper.fsp at gmail dot com
Target Milestone: ---
tst-stack-align.h has
#define TEST_STACK_ALIGN() \
({ \
double _d = 12.0; \
long double _ld = 15.0; \
int _ret = 0; \
printf ("double: %g %p %zu\n", _d, &_d, __alignof (double)); \
if ((((uintptr_t) &_d) & (__alignof (double) - 1)) != 0) \
_ret = 1; \
\
printf ("ldouble: %Lg %p %zu\n", _ld, &_ld, __alignof (long double)); \
if ((((uintptr_t) &_ld) & (__alignof (long double) - 1)) != 0) \
_ret = 1; \
_ret; \
})
But compiler may optimize out
if ((((uintptr_t) &_d) & (__alignof (double) - 1)) != 0)
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* [Bug libc/27901] TEST_STACK_ALIGN doesn't work
2021-05-23 15:55 [Bug libc/27901] New: TEST_STACK_ALIGN doesn't work hjl.tools at gmail dot com
@ 2021-05-24 14:45 ` hjl.tools at gmail dot com
0 siblings, 0 replies; 2+ messages in thread
From: hjl.tools at gmail dot com @ 2021-05-24 14:45 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=27901
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |2.34
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for 2.34 by
commit 79aec841029c160a85f46564f8bad132af008e30
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Sun May 23 09:15:52 2021 -0700
Properly check stack alignment [BZ #27901]
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2021-05-23 15:55 [Bug libc/27901] New: TEST_STACK_ALIGN doesn't work hjl.tools at gmail dot com
2021-05-24 14:45 ` [Bug libc/27901] " hjl.tools at gmail dot com
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