gcc-4.3 optimizer bugs?

[Callum Lerwick]

On Wed, 2008-02-27 at 05:45 -0500, Neal Becker wrote:
> We are trying to track down a numerical problem with unuran that occurs on
> gcc-4.3.  I know that gcc now has a very extensive test suite, and bugs are
> not common.  I'm just wondering, are others finding similar problems with
> gcc-4.3?
> 
> We are working on preparing a bug report.  The symptoms are:
> 1) Problem disappears if -O0
> 2) Problem disappears if a printf is added
> 3) valgrind is silent

Aliasing bug? See if -fno-strict-aliasing works around it.
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