Compile attached test case with optimization causes an ICE: $ gcc -c -O1 bug.c bug.c: In function 'parsearguments': bug.c:46: error: Attempt to delete prologue/epilogue insn: (insn/f 97 96 98 0 (set (mem:SI (plus:SI (reg/f:SI 30 %r30) (const_int -124 [0xffffff84])) [0 S4 A32]) (reg:SI 4 %r4)) -1 (nil) (nil)) bug.c:46: internal compiler error: in propagate_one_insn, at flow.c:1690 Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://gcc.gnu.org/bugs.html> for instructions. For Debian GNU/Linux specific bug reporting instructions, see <URL:file:///usr/share/doc/gcc-4.0/README.Bugs>.
This may be related to PR12535 but the code that triggers the problem is different. -- Summary: [3.4/4.0/4.1 regression] Attempt to delete prologue/epilogue insn Product: gcc Version: 4.0.3 Status: UNCONFIRMED Severity: normal Priority: P3 Component: rtl-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: tausq at debian dot org GCC build triplet: hppa-unknown-linux GCC host triplet: hppa-unknown-linux GCC target triplet: hppa-unknown-linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26945