[ICE] Vectorization compiler pass fails

[IgWod]

The following code:

#include <stdio.h>
#include <stdlib.h>
#include "../common/common.h"
#include "../common/sync.h"

void* sref;

int main() {
  struct timeval start;
  struct timeval end;

  int block_size = 1000;
  int array_size = 100000;
  int number_blocks = array_size / block_size;
  int number_streams = number_blocks;

  double s[number_streams] __attribute__((stream));
  sref = malloc(number_streams * sizeof(void*));
  memcpy(sref, s, number_streams * sizeof(void*));

  double input[array_size];
  double* inputref = input;

  for (int i = 0; i < array_size; i++) input[i] = 1.0;

  double output[array_size];
  double* outputref = output;

  gettimeofday(&start, NULL);

  for (int id = 0; id < number_blocks; id++) {
    double out[block_size];

    #pragma omp task output(sref[id] << out[block_size])
    {
      for (int i = 0; i < block_size; i++)
        out[i] = inputref[id * block_size + i];
    }
  }

  for (int id = 0; id < number_blocks; id++) {
    double in[block_size];

    #pragma omp task input(sref[id] >> in[block_size])
    {
      for (int i = 0; i < block_size; i++)
        outputref[id * block_size + i] = in[i];
    }
  }

  #pragma omp taskwait

  gettimeofday(&end, NULL);

  printf("%.5f\n", tdiff(&end, &start));

  free(sref);

  return 0;
}

Fails with:

for_task.c:8:5: internal compiler error: in vectorizable_store, at tree-vect-stmts.c:7142
    8 | int main() {
      |     ^~~~
0xc688a6 vectorizable_store
        ../../gcc/tree-vect-stmts.c:7141
0xc7308d vect_transform_stmt(_stmt_vec_info*, gimple_stmt_iterator*, _slp_tree*, _slp_instance*)
        ../../gcc/tree-vect-stmts.c:9805
0xc90f2a vect_schedule_slp_instance
        ../../gcc/tree-vect-slp.c:4021
0xc9530d vect_schedule_slp(vec_info*)
        ../../gcc/tree-vect-slp.c:4095
0xc99127 vect_slp_bb(basic_block_def*)
        ../../gcc/tree-vect-slp.c:3049
0xc9b92a execute
        ../../gcc/tree-vectorizer.c:1306

This is a common problem with a workaround being a compiler flag -fno-tree-vectorize.

[IgWod]

This is a known issues for a while now, but I added it to GitHub for tracking purposes.