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fix ICE with BB vectorization of PHIs 

This fixes a vector CTOR insertion issue when we try to insert after
a PHI node.

2020-10-09  Richard Biener  <rguenther@suse.de>

	* tree-vect-slp.c (vect_create_constant_vectors): Properly insert
	after PHIs.

	* gcc.dg/vect/bb-slp-phis-1.c: New testcase.
This commit is contained in:
Richard Biener 2020-10-09 08:56:21 +02:00
parent da9df69975
commit 36500ed18a
2 changed files with 23 additions and 1 deletions
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20
gcc/testsuite/gcc.dg/vect/bb-slp-phis-1.c Normal file
View File

@ -0,0 +1,20 @@
/* From gcc.c-torture/execute/loop-13.c */
/* { dg-do compile } */
/* { dg-additional-options "-march=cascadelake" { target x86_64-*-* i?86-*-* } } */
#define TYPE long
void
scale (TYPE *alpha, TYPE *x, int n)
{
int i, ix;
if (*alpha != 1)
for (i = 0, ix = 0; i < n; i++, ix += 2)
{
TYPE tmpr, tmpi;
tmpr = *alpha * x[ix];
tmpi = *alpha * x[ix + 1];
x[ix] = tmpr;
x[ix + 1] = tmpi;
}
}

4
gcc/tree-vect-slp.c
View File

@ -4144,7 +4144,9 @@ vect_create_constant_vectors (vec_info *vinfo, slp_tree op_node)
if (insert_after)
{
gimple_stmt_iterator gsi;
if (!stmt_ends_bb_p (insert_after->stmt))
if (gimple_code (insert_after->stmt) == GIMPLE_PHI)
gsi = gsi_after_labels (gimple_bb (insert_after->stmt));
else if (!stmt_ends_bb_p (insert_after->stmt))
gsi = gsi_for_stmt (insert_after->stmt);
else
{