http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52132
Bug #: 52132 Summary: [4.7 Regression] ICE in loc_descriptor Classification: Unclassified Product: gcc Version: 4.7.0 Status: UNCONFIRMED Keywords: ice-on-valid-code Severity: normal Priority: P3 Component: debug AssignedTo: ja...@gcc.gnu.org ReportedBy: ja...@gcc.gnu.org Target: i686-linux The following testcase ICEs with -m32 -g -O2 -std=c99 on x86_64-linux. The bug is likely in regstack, which changes: rh787518.i.216r.sched2:(debug_insn 20 58 21 2 (var_location:SI D#1 (subreg:SI (reg:SF 8 st [orig:66 D.1248 ] [66]) 0)) rh787518.i:10 -1 to: rh787518.i.218r.stack:(debug_insn 20 58 21 2 (var_location:SI D#1 (reg:SF 8 st)) rh787518.i:10 -1 (note the lost subreg). The regression started with http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=178597 though that likely just made a latent bug into a reprduceable one.