* The reincarnation of PR15242
@ 2009-09-07 16:12 Andrew Haley
2009-09-08 21:18 ` Ian Lance Taylor
0 siblings, 1 reply; 4+ messages in thread
From: Andrew Haley @ 2009-09-07 16:12 UTC (permalink / raw)
To: gcc; +Cc: pinskia
This seems to be an an old bug that has come back. We're generating
L1210:
jmp *%eax
.L4:
.L5:
...
jmp .L1210
.L1171:
.L1172:
...
jmp .L1210
.L1168:
.L1169:
...
jmp .L1210
instead of
.L1210:
jmp *%eax
.L4:
.L5:
...
jmp *%eax
.L1171:
.L1172:
...
jmp *%eax
.L1168:
.L1169:
...
jmp *%eax
Current gcc trunk, x86, gcc -O3 ef.i -S -m32.
Attachment in old Bugzilla entry at
http://gcc.gnu.org/bugzilla/attachment.cgi?id=6206&action=view
Andrew.
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: The reincarnation of PR15242
2009-09-07 16:12 The reincarnation of PR15242 Andrew Haley
@ 2009-09-08 21:18 ` Ian Lance Taylor
2009-09-09 9:17 ` Andrew Haley
0 siblings, 1 reply; 4+ messages in thread
From: Ian Lance Taylor @ 2009-09-08 21:18 UTC (permalink / raw)
To: Andrew Haley; +Cc: gcc, pinskia
Andrew Haley <aph@redhat.com> writes:
> This seems to be an an old bug that has come back. We're generating
>
> L1210:
> jmp *%eax
> .L4:
> .L5:
> ...
> jmp .L1210
> .L1171:
> .L1172:
> ...
> jmp .L1210
> .L1168:
> .L1169:
> ...
> jmp .L1210
>
>
> instead of
>
> .L1210:
> jmp *%eax
> .L4:
> .L5:
> ...
> jmp *%eax
> .L1171:
> .L1172:
> ...
> jmp *%eax
> .L1168:
> .L1169:
> ...
> jmp *%eax
>
> Current gcc trunk, x86, gcc -O3 ef.i -S -m32.
>
> Attachment in old Bugzilla entry at
> http://gcc.gnu.org/bugzilla/attachment.cgi?id=6206&action=view
We should have something like this in the testsuite.
Ian
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: The reincarnation of PR15242
2009-09-08 21:18 ` Ian Lance Taylor
@ 2009-09-09 9:17 ` Andrew Haley
2009-09-09 14:16 ` Ian Lance Taylor
0 siblings, 1 reply; 4+ messages in thread
From: Andrew Haley @ 2009-09-09 9:17 UTC (permalink / raw)
To: Ian Lance Taylor; +Cc: gcc, pinskia
Ian Lance Taylor wrote:
> Andrew Haley <aph@redhat.com> writes:
>
>> This seems to be an an old bug that has come back. We're generating
>>
>> L1210:
>> jmp *%eax
>> .L4:
>> .L5:
>> ...
>> jmp .L1210
>> .L1171:
>> .L1172:
>> ...
>> jmp .L1210
>> .L1168:
>> .L1169:
>> ...
>> jmp .L1210
>>
>>
>> instead of
>>
>> .L1210:
>> jmp *%eax
>> .L4:
>> .L5:
>> ...
>> jmp *%eax
>> .L1171:
>> .L1172:
>> ...
>> jmp *%eax
>> .L1168:
>> .L1169:
>> ...
>> jmp *%eax
>>
>> Current gcc trunk, x86, gcc -O3 ef.i -S -m32.
>>
>> Attachment in old Bugzilla entry at
>> http://gcc.gnu.org/bugzilla/attachment.cgi?id=6206&action=view
>
>
> We should have something like this in the testsuite.
I've been thinking about that. How would one go about writing a testcase?
I guess we're looking for a lot of jmp instrs all bracnhing to the same
label.
Andrew.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: The reincarnation of PR15242
2009-09-09 9:17 ` Andrew Haley
@ 2009-09-09 14:16 ` Ian Lance Taylor
0 siblings, 0 replies; 4+ messages in thread
From: Ian Lance Taylor @ 2009-09-09 14:16 UTC (permalink / raw)
To: Andrew Haley; +Cc: gcc, pinskia
Andrew Haley <aph@redhat.com> writes:
> I've been thinking about that. How would one go about writing a testcase?
> I guess we're looking for a lot of jmp instrs all bracnhing to the same
> label.
Yeah. I would probably just wimp out and write a couple of target
specific test cases.
Ian
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2009-09-09 14:16 UTC | newest]
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2009-09-07 16:12 The reincarnation of PR15242 Andrew Haley
2009-09-08 21:18 ` Ian Lance Taylor
2009-09-09 9:17 ` Andrew Haley
2009-09-09 14:16 ` Ian Lance Taylor
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