[Bug tree-optimization/52285] [4.7 Regression] libgcrypt _gcry_burn_stack slowdown

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52285

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-02-16 18:50:27 UTC ---
Created attachment 26681
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26681
gcc47-pr52285.patch

Patch to ignore clobber stmts in tailc/tailr passes.  This turns this testcase
back into a loop, for which the bad IVOPT decision matters.