https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61737
--- Comment #8 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
(In reply to dhowe...@redhat.com from comment #0)
> ../../../gcc-4.9.0-20140702/libgcc/libgcc2.c: In function ‘__subvsi3’:
> ../../../gcc-4.9.0-20140702/libgcc/libgcc2.c:122:1: error: unrecognizable
> insn:
> }
> ^
> (call_insn 27 26 28 7 (parallel [
> (call (mem:QI (symbol_ref:SI ("abort") [flags 0x41]
> <function_decl 0x7f5784e05d00 abort>) [0 __builtin_abort S1 A8])
This symbol_ref must be wrapped inside a CONST by the middle-end.
Something changed such that that doesn't happen anymore; that's the bug.
Unless this was a deliberate general change in representation, which I doubt.
Still investigating...
