[PATCH] Fix middle-end/67133, part 1

[Marek Polacek]

On Thu, Aug 20, 2015 at 11:02:17AM +0200, Andreas Schwab wrote:
> Marek Polacek <polacek@redhat.com> writes:
> 
> > 	PR middle-end/67133
> > 	* gimple-ssa-isolate-paths.c
> > 	(insert_trap_and_remove_trailing_statements): Rename to ...
> > 	(insert_trap): ... this.  Don't remove trailing statements; split
> > 	block instead.
> > 	(find_explicit_erroneous_behaviour): Don't remove all outgoing edges.
> 
> This breaks go on aarch64:
> 
> ../../../libgo/go/encoding/gob/decode.go: In function ‘gob.decIgnoreOpFor.pN20_encoding_gob.Decoder’:
> ../../../libgo/go/encoding/gob/decode.go:843:1: internal compiler error: in operator[], at vec.h:714
>  func (dec *Decoder) decIgnoreOpFor(wireId typeId) decOp {
>  ^
> 0xac5c3b vec<edge_def*, va_gc, vl_embed>::operator[](unsigned int)
>         ../../gcc/vec.h:714
> 0xac5c3b extract_true_false_edges_from_block(basic_block_def*, edge_def**, edge_def**)
>         ../../gcc/tree-cfg.c:8456
> 0xace9bf gimple_verify_flow_info
>         ../../gcc/tree-cfg.c:5260
> 0x6ea1ab verify_flow_info()
>         ../../gcc/cfghooks.c:260
> 0xadeca3 cleanup_tree_cfg_noloop
>         ../../gcc/tree-cfgcleanup.c:739
> 0xadeca3 cleanup_tree_cfg()
>         ../../gcc/tree-cfgcleanup.c:788
> 0x9d21c3 execute_function_todo
>         ../../gcc/passes.c:1900
> 0x9d2b07 execute_todo
>         ../../gcc/passes.c:2005

Whilst I'm struggling with building cross libgo to reproduce this, is
there something like preprocessed source for go?  So that ideally I'd
just run ./go1 foo.go?  That'd help tremendously.

	Marek