------- Additional Comments From belyshev at depni dot sinp dot msu dot ru
2005-08-18 21:14 -------
Created an attachment (id=9543)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9543&action=view)
testcase, part2 (3112 bytes)
These two files are self-contained tescase for this bug, to compile use this
command:
gcc bug1.c bug2.c -O3 -fno-strict-aliasing -fomit-frame-pointer -march=i486
Seems that gcse2 miscompiles gauss_pivot_ker() from bug2.c, here is a diff
between code generated with -fno-gcse-after-reload and w/o that option:
movl $1, 100(%esp)
movl $0, 36(%esp)
- .p2align 4,,15
-.L23:
movl 100(%esp), %edi
+ movl 100(%esp), %ecx
sall $2, %edi
pushl $0
pushl $0
pushl $0
- movl 100(%esp), %ecx
movl (%ecx,%edi), %ecx
pushl %ecx
call gauss_get_pivot_max
which is clearly wrong.
--
What |Removed |Added
----------------------------------------------------------------------------
Attachment #9526 is|0 |1
obsolete| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23453
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