[Bug tree-optimization/55559] Marshalling double through union with inlines, incorrect behavior with -O2

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55559



--- Comment #3 from Mikael Pettersson <mikpe at it dot uu.se> 2012-12-02 
16:04:49 UTC ---

Created attachment 28853

  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28853

simplified test case in plain C



The regression started with Richard Biener's "[PATCH] Teach SCCVN/FRE

expression insertion, optimize type-punning through unions (final!)" patch in

r133218:

http://gcc.gnu.org/ml/gcc-patches/2008-03/msg00873.html

http://gcc.gnu.org/ml/gcc-cvs/2008-03/msg00436.html