[Bug tree-optimization/103253] [12 Regression] ICE: Segmentation fault (in convert_mult_to_fma or in vect_recog_mask_conversion_pattern)

["asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103253

Arseny Solokha <asolokha at gmx dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[12 Regression] ICE:        |[12 Regression] ICE:
                   |Segmentation fault (in      |Segmentation fault (in
                   |convert_mult_to_fma)        |convert_mult_to_fma or in
                   |                            |vect_recog_mask_conversion_
                   |                            |pattern)

--- Comment #1 from Arseny Solokha <asolokha at gmx dot com> ---
And compiling the following testcase, reduced from the same original file, w/
-march=knm -O2 -fassociative-math -fopenmp -fno-delete-dead-exceptions
-fno-signed-zeros -fno-trapping-math, yields this instead:

double
do_work (double *A, double do_work_pri)
{
  int i;

#pragma omp simd
  for (i = 0; i < 30; ++i)
    do_work_pri = !i ? 0.5 : i * 0.5 + A[i];

  return do_work_pri;
}

% x86_64-unknown-linux-gnu-g++-12.0.0 -march=knm -O2 -fassociative-math
-fopenmp -fno-delete-dead-exceptions -fno-signed-zeros -fno-trapping-math -c
qozmqkqm.c
during GIMPLE pass: slp
qozmqkqm.c: In function 'double do_work(double*, double)':
qozmqkqm.c:2:1: internal compiler error: Segmentation fault
    2 | do_work (double *A, double do_work_pri)
      | ^~~~~~~
0x1182a5f crash_signal
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211114/work/gcc-12-20211114/gcc/toplev.c:322
0x2011579 contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211114/work/gcc-12-20211114/gcc/tree.h:3554
0x2011579 vect_recog_mask_conversion_pattern
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211114/work/gcc-12-20211114/gcc/tree-vect-patterns.c:4509
0x20125ca vect_pattern_recog_1
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211114/work/gcc-12-20211114/gcc/tree-vect-patterns.c:5689
0x2019d1d vect_pattern_recog(vec_info*)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211114/work/gcc-12-20211114/gcc/tree-vect-patterns.c:5846
0x142cb0a vect_slp_analyze_bb_1
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211114/work/gcc-12-20211114/gcc/tree-vect-slp.c:5737
0x142cb0a vect_slp_region
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211114/work/gcc-12-20211114/gcc/tree-vect-slp.c:5846
0x142ec2b vect_slp_bbs
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211114/work/gcc-12-20211114/gcc/tree-vect-slp.c:6038
0x142f09b vect_slp_function(function*)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211114/work/gcc-12-20211114/gcc/tree-vect-slp.c:6126
0x1435ad1 execute
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211114/work/gcc-12-20211114/gcc/tree-vectorizer.c:1459

(Note g++ instead of gcc here.)