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[Bug target/15551] [3.4/3.5? Regression] -mtune=pentium4 -O2 with sjlj EH breaks stack probe worker on windows32 targets


------- Additional Comments From me at cgf dot cx  2004-06-15 17:42 -------
Subject: Re:  [3.4/3.5? Regression] -mtune=pentium4  -O2

On Thu, Jun 10, 2004 at 08:47:21AM -0400, Kelley Cook wrote:
>I previously wrote
>>The patch also applies to 3.4 and passed an all languages bootstrap; 
>>I'll also regtest it there.
>>
>>Mark, after a week on mainline, would this be OK for 3.4.1 assuming that 
>>it also passes?
>>
>>2004-06-07  Kelley Cook  <kcook@gcc.gnu.org>
>>
>>	* config/i386/i386.c (ix86_expand_prologue): Mark win32 allocate insn
>>	as prologue.
>>	* config/i386/i386.md (allocate_stack): Clobber alloca memory.
>>	(allocate_stack_worker_postreload): Likewise.
>>	(allocate_stack_worker_rex64): Likewise.
>>	(allocate_stack_worker_rex64_postreload): Likewise.
>>	(allocate_stack_worker_1): Likewise.
>
>For what it is worth, on both mainline and 3.4.1 this patch, under 
>pentium4-pc-cygwin, created no new regressions. Moreover, it fixed one of 
>them:
>
>g77.f-torture/execute/labug1.f execution
>
>OK to install?

This doesn't seem to have been added yet.

I think this particular problem has been kicked around quite a bit in
various incarnations.  I believe that this was code that Richard
Henderson added not so long ago.  Maybe it would be a good idea to have
him verify that it is correct?

cgf


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15551


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