[Bug rtl-optimization/69764] [5 Regression] ICE on x86_64-linux-gnu at -O0 (in decompose, at rtl.h:2107)

[dhowells at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69764

dhowells at redhat dot com <dhowells at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |dhowells at redhat dot com

--- Comment #15 from dhowells at redhat dot com <dhowells at redhat dot com> ---
(In reply to Andreas Schwab from comment #7)
> ...
> In file included from ../../../libgcc/libgcc2.c:56:0:
> ../../../libgcc/libgcc2.c: In function ‘__mulvsi3’:
> ../../../libgcc/libgcc2.h:208:19: internal compiler error: in
> maybe_legitimize_operand, at optabs.c:6893
>  #define __NW(a,b) __ ## a ## si ## b
>                    ^
> ../../../libgcc/libgcc2.h:299:19: note: in expansion of macro ‘__NW’
>  #define __mulvSI3 __NW(mulv,3)
>                    ^~~~
> ../../../libgcc/libgcc2.c:152:1: note: in expansion of macro ‘__mulvSI3’
>  __mulvSI3 (Wtype a, Wtype b)
>  ^~~~~~~~~
> 0x9ab2ce maybe_legitimize_operand
>         ../../gcc/optabs.c:6893
> ...

I'm seeing exactly this backtrace also building Fedora the cross-gcc-6 m68k
target, but the error goes away with the patch from bug 69885.