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Re: [Bug tree-optimization/31862] Loop IM and other optimizations harmful for -fopenmp
- From: "Andrew Pinski" <pinskia at gmail dot com>
- To: gcc-bugzilla at gcc dot gnu dot org
- Cc: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 8 May 2007 07:59:20 -0700
- Subject: Re: [Bug tree-optimization/31862] Loop IM and other optimizations harmful for -fopenmp
- References: <bug-31862-87@http.gcc.gnu.org/bugzilla/> <20070508144416.22950.qmail@sourceware.org>
On 8 May 2007 14:44:16 -0000, dnovillo at acm dot org
<gcc-bugzilla@gcc.gnu.org> wrote:
The original code did not have a race condition. The compiler
transformations introduced a race-condition. This *is* a compiler
bug.
Actually the original code has a race condition, if another thread is
reading from var and then acting on that and writting back. This is
why threading programming is considered hard.