GCC trunk gets a ICE when building SPEC CPU2000 test 254.gap with "-m64 -O2 -mcpu=power7 -mno-altivec -ftree-vectorize", as demonstrated by a rather large minimized testcase that I'll attach to this PR.
elm3b149% /home/janis/tools/gcc-trunk-anonsvn/bin/gcc -c -m64 -O2 -mcpu=power7 -mno-altivec -ftree-vectorize bug.c bug.c: In function SyFgets: bug.c:124:1: error: insn does not satisfy its constraints: (insn 787 422 425 43 bug.c:87 (set (reg:TI 11 11) (const_double 2314885530818453536 [0x2020202020202020] 2314885530818453536 [0x2020202020202020] 0 [0x0])) 375 {*movti_ppc64} (nil)) bug.c:124:1: internal compiler error: in reload_cse_simplify_operands, at postreload.c:396 Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. POWER7 support is new in GCC 4.5 so this is not a regression from earlier releases. -- Summary: ICE in reload_cse_simplify_operands for 254.gap with - mcpu=power7 Product: gcc Version: 4.5.0 Status: UNCONFIRMED Keywords: ice-on-valid-code Severity: normal Priority: P3 Component: target AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: janis at gcc dot gnu dot org GCC target triplet: poewrpc64-linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42419