For datarefs with big gap, split them into different groups.

The patch tries to solve miss vectorization for below case.

void
foo (int* a, int* restrict b)
{
    b[0] = a[0] * a[64];
    b[1] = a[65] * a[1];
    b[2] = a[2] * a[66];
    b[3] = a[67] * a[3];
    b[4] = a[68] * a[4];
    b[5] = a[69] * a[5];
    b[6] = a[6] * a[70];
    b[7] = a[7] * a[71];
}

In vect_analyze_data_ref_accesses, a[0], a[1], .. a[7], a[64], ...,
a[71] are in same group with size of 71. It caused vectorization
unprofitable.

gcc/ChangeLog:

	PR tree-optimization/119181
	* tree-vect-data-refs.cc (vect_analyze_data_ref_accesses):
	Split datarefs when there's a gap bigger than
	MAX_BITSIZE_MODE_ANY_MODE.

gcc/testsuite/ChangeLog:

	* gcc.dg/vect/bb-slp-pr119181.c: New test.

0 files changed, 0 insertions, 0 deletions