[Bug target/111488] New: ICE ion riscv gcc.dg/vect/vect-126.c

[Bug target/111488] New: ICE ion riscv gcc.dg/vect/vect-126.c

[rdapp at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111488

            Bug ID: 111488
           Summary: ICE ion riscv gcc.dg/vect/vect-126.c
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rdapp at gcc dot gnu.org
  Target Milestone: ---
            Target: riscv

I see an ICE in vect-126.c.  A small reproducer is:

int *a[1024], b[1024];

void
f1 (void)
{
  for (int i = 0; i < 1024; i++)
    {
      int *p = &b[0];
      a[i] = p + i;
    }
}

vect-126.c:18:1: internal compiler error: Segmentation fault
   18 | }
      | ^
0x111e61f crash_signal
        ../../gcc/toplev.cc:314
0xcfc91d mark_label_nuses
        ../../gcc/emit-rtl.cc:3755
0xcfc969 mark_label_nuses
        ../../gcc/emit-rtl.cc:3763
0xcfc969 mark_label_nuses
        ../../gcc/emit-rtl.cc:3763
0xcfc969 mark_label_nuses
        ../../gcc/emit-rtl.cc:3763

This happens after the splitter
(define_insn_and_split "*single_widen_fma<mode>".

At first glance it seems as if the insn sequence is corrupt as we're looking
into a <nil> value but I haven't checked further.  This is likely the same
error that prevents several SPECfp testcases to build.  Can investigate further
tomorrow.

[Bug target/111488] ICE ion riscv gcc.dg/vect/vect-126.c

[rdapp at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111488

Robin Dapp <rdapp at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |juzhe.zhong at rivai dot ai

--- Comment #1 from Robin Dapp <rdapp at gcc dot gnu.org> ---
Also happens in the rvv.exp testsuite now, e.g. gather_load_run-11.c.

[Bug target/111488] ICE ion riscv gcc.dg/vect/vect-126.c

[patrick at rivosinc dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111488

--- Comment #2 from Patrick O'Neill <patrick at rivosinc dot com> ---
Thanks for filing the PR Robin!

More info about the testsuite failures on the mailing list:
https://inbox.sourceware.org/gcc-patches/92113a4b-eba7-c63c-9ee3-f11be30d99c3@rivosinc.com/

CI listing the new failures:
https://github.com/patrick-rivos/riscv-gnu-toolchain/issues/355

All these failures have the same backtrace so they likely have the same
root-cause.

[Bug target/111488] ICE ion riscv gcc.dg/vect/vect-126.c

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111488

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Lehua Ding <lhtin@gcc.gnu.org>:

https://gcc.gnu.org/g:d024a31a09d18d2586769602205a60ff3afe568c

commit r14-4166-gd024a31a09d18d2586769602205a60ff3afe568c
Author: Lehua Ding <lehua.ding@rivai.ai>
Date:   Wed Sep 20 13:35:16 2023 +0800

    RISC-V: Fixed ICE caused by missing operand

    This ICE appears in GCC compiled with -O2 flags.

            PR target/111488

    gcc/ChangeLog:

            * config/riscv/autovec-opt.md: Add missed operand.

[Bug target/111488] ICE ion riscv gcc.dg/vect/vect-126.c

[rdapp at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111488

Robin Dapp <rdapp at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #4 from Robin Dapp <rdapp at gcc dot gnu.org> ---
Fixed.