Current trunk and 4.1 branch ICE on powerpc-linux compiling mesa from SPEC CPU2000:
elm3b11% /opt/gcc-nightly/4.1/bin/gcc -c -Os -ftree-loop-linear mesa1201.c mesa1201.c: In function foo: mesa1201.c:7: error: definition in block 9 does not dominate use in block 3 for SSA_NAME: q_25 in statement: q_1 = PHI <q_15(0), q_25(3)>; PHI argument q_25 for PHI node q_1 = PHI <q_15(0), q_25(3)>; mesa1201.c:7: internal compiler error: verify_ssa failed The testcase passes with GCC 4.0.2 and with the 4.0 branch. A regression hunt identified the following very large patch: http://gcc.gnu.org/viewcvs?view=rev&rev=102356 r102356 | irar | 2005-07-25 12:05:07 +0000 (Mon, 25 Jul 2005) I'll attach a minimized testcase. -- Summary: verify_ssa ICE for mesa with -Os -ftree-loop-linear Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: janis at gcc dot gnu dot org GCC target triplet: powerpc-linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25211
