Re: -frtl-abstract-sequences broken?

[Richard Guenther <richard dot guenther at gmail dot com>]

On Sat, Jan 10, 2009 at 3:33 PM, Laurent GUERBY <laurent@guerby.net> wrote:
> Hi,
>
> It looks like the tests for -frtl-abstract-sequences are either skipped
> or xfailed for a long list of platforms:
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33642
> "unrecognizable insn for -frtl-abstract-sequences"
> <<
> Almost any source file compiled for any of a large number of targets
> (powerpc*-*, arm-eabi, hppa-linux, mipsel-linux, s390*-linux, sh*-*, sparc*-*)
> with -O2 -frtl-abstract-sequences results in the following:
>
> bug1.c: In function 'foo':
> bug1.c:8: error: unrecognizable insn:
> (insn 28bug1.c:8: internal compiler error: Segmentation fault
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <http://gcc.gnu.org/bugs.html> for instructions.
>
> The testcase used here:
>
> int foo (void)
> {
>  return 0;
> }
>>>
>
> gcc/testsuite/gcc.c-torture/compile/pr11832.c
> /* { dg-do compile } */
> /* Currently ICEs for Alpha, IA64, HPPA, MIPS, CRIS, Xtensa, PowerPC, SH and SPARC; see PR33642.  */
> /* { dg-xfail-if "PR33642" { alpha*-*-* hppa*-*-* mips*-*-* powerpc*-*-* cris-*-* crisv32-*-* ia64-*-* xtensa*-*-* sh*-*-* sparc*-*-* s390*-*-* } { "*" } { "" } } */
> /* Currently ICEs for (x86 && ilp32 && pic).  */
> /* { dg-xfail-if "PR33642/36240" { { i?86-*-* x86_64-*-* } && { ilp32 && { ! nonpic } } } { "*" } { "" } } */
>
>
> I was about to add arm*-*-* but there are other reports about this flag
> (not exhaustive, just based on summary):
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30121
> "ICE on frtl-abstract-sequences"
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31549
> "Documentation for -frtl-abstract-sequences is in the wrong place"
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36240
> "PIC and -frtl-abstract-sequences"
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38694
> "gcc.c-torture/compile/pr11832.c and pr33009.c -frtl-abstract-sequences
> ICE on arm-linux-gnueabi on 4.3.2 and trunk"
>
> What should be done about this optimization for 4.4 and 4.5? Is there
> anyone trying to fix its shortcomings?
>
> Thanks in advance,

I will happily approve a patch to make -frtl-abstract-sequences a
no-op and remove
its implementation.

Thanks,
Richard.

> Laurent
>
>
>