[Bug target/48986] Missed optimization in atomic decrement on x86/x64

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48986

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-05-16 12:50:59 UTC ---
Created attachment 24252
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24252
gcc47-pr48986.patch

Untested patch using peephole2.