[Bug tree-optimization/54146] Very slow compile with attribute((flatten))

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54146

--- Comment #18 from Steven Bosscher <steven at gcc dot gnu.org> 2012-08-05 
21:13:26 UTC ---
Created attachment 27946
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27946
Speed up ifcvt.c:check_cond_move_block

This speeds up the pre-reload if-conversion passes by using a smarter data
structure to keep track of register values.