http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48679
Mikael Pettersson <mikpe at it dot uu.se> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |vmakarov at gcc dot gnu.org --- Comment #3 from Mikael Pettersson <mikpe at it dot uu.se> 2011-05-04 21:26:22 UTC --- Bisection identified Vladimir Makarov's big IRA update in r171649 as the source of this regression. gcc-4.7-20110326 (r171562) builds OK if the PR48332 fix is pre-applied, but gcc-4.7-20110402 (r171894) fails with massive bootstrap comparison failures. Bisecting between these points was a pain because almost all bisection points failed to build due to ICEs, however bisection narrowed in on r171649. I then collected the fixes for all known regression from r171649 (I counted 9 of them), and redid the bisection with relevant fixes pre-applied. This time the builds did not ICE but failed after stage 3 with bootstrap comparison failures. Again bisection identified r171649. Finally I built gcc-4.7-20110402 (r171894) with all IRA changes from r171649 to r171894 reverted, and that bootstrapped fine.