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* [Bug target/52670] New: -mabi=ms generates bad code
@ 2012-03-22 15:52 dg at cowlark dot com
2023-12-17 7:12 ` [Bug target/52670] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: dg at cowlark dot com @ 2012-03-22 15:52 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52670
Bug #: 52670
Summary: -mabi=ms generates bad code
Classification: Unclassified
Product: gcc
Version: 4.6.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: dg@cowlark.com
If I take this test case:
int z(int i) { return i; }
...and compile it with:
gcc-4.6 -Os -m32 -mabi=sysv -o test.s -c test.c -S -fomit-frame-pointer
...I get this (trimmed):
movl 4(%esp), %eax
ret
However, if I compile it with this:
gcc-4.6 -Os -m32 -mabi=ms -o test.s -c test.c -S -fomit-frame-pointer
...then I get this, which is wrong:
movl 36(%esp), %eax
ret
Compiling with a copy of the Mingw compiler or with Visual C produces (the
equivalent of) the 4 result. The -fomit-frame-pointer is there purely to reduce
the size of the output; the bug persists without it. This appears to affect all
stack accesses. It *seems* to only apply to ia32 code. amd64 code appears to be
fine, but my target environment is ia32 only so I haven't looked into amd64
much.
This was discussed on gcc-help here:
http://gcc.gnu.org/ml/gcc-help/2012-03/msg00281.html
This patch appears to fix the issue:
http://gcc.gnu.org/ml/gcc-patches/2011-03/txt00118.txt
(although the patch needs a bit of work to apply).
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug target/52670] -mabi=ms generates bad code
2012-03-22 15:52 [Bug target/52670] New: -mabi=ms generates bad code dg at cowlark dot com
@ 2023-12-17 7:12 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-12-17 7:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52670
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |4.7.0
Resolution|--- |FIXED
Keywords| |wrong-code
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fixed for GCC 4.7.0 by r0-107474-g6510e8bbf0b551 .
^ permalink raw reply [flat|nested] 2+ messages in thread
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2012-03-22 15:52 [Bug target/52670] New: -mabi=ms generates bad code dg at cowlark dot com
2023-12-17 7:12 ` [Bug target/52670] " pinskia at gcc dot gnu.org
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