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tree-optimization/98191 - fix BIT_INSERT_EXPR sequence vectorization

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This adds a missing check.

2020-12-08  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/98191
	* tree-vect-slp.c (vect_slp_check_for_constructors): Do not
	follow a non-SSA def chain.

	* gcc.dg/torture/pr98191.c: New testcase.
This commit is contained in:
Richard Biener 2020-12-08 09:56:53 +01:00
parent a294e6368f
commit c2c198bfd1
2 changed files with 12 additions and 1 deletions
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10
gcc/testsuite/gcc.dg/torture/pr98191.c Normal file
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@ -0,0 +1,10 @@
/* { dg-do compile } */
typedef double v2df __attribute__((vector_size(2*sizeof(double))));
v2df foo (double *y)
{
v2df x = (v2df){ 1.0, 2.0 };
x[0] = *y;
return x;
}

3
gcc/tree-vect-slp.c
View file

@ -4243,7 +4243,8 @@ vect_slp_check_for_constructors (bb_vec_info bb_vinfo)
def = gimple_assign_rhs1 (assign);
do
{
if (!has_single_use (def))
if (TREE_CODE (def) != SSA_NAME
|| !has_single_use (def))
break;
gimple *def_stmt = SSA_NAME_DEF_STMT (def);
unsigned this_lane;