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tree-optimization/104782 - adjust PR101636 fix

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This reverts the reversion of r10-5979 amending the CTOR case
with a comment as to why the conversion is not necessary there.
It also adds a testcase (but not for the CTOR case).

2022-03-07  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/104782
	* tree-vect-slp.cc (vectorize_slp_instance_root_stmt):
	Re-instantiate r10-5979 fix, add comment.

	* gcc.dg/vect/pr104782.c: New testcase.
This commit is contained in:
Richard Biener 2022-03-07 11:11:44 +01:00
parent 40c1d4a07e
commit 5db1d7f143
2 changed files with 25 additions and 0 deletions
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18
gcc/testsuite/gcc.dg/vect/pr104782.c Normal file
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@ -0,0 +1,18 @@
/* { dg-do compile } */
/* { dg-additional-options "-O3" } */
/* { dg-additional-options "-march=armv8.2-a+sve -msve-vector-bits=128" { target aarch64-*-* } } */
int a, b, c;
static int d;
short *q;
void f() {
int *p = &d;
b = 9;
for (b = 9; b; b--) {
a = 2;
for (c = 2; c <= 9; c++) {
for (int i = 0; i < 3; i++)
*p |= (*q)++;
}
}
}

7
gcc/tree-vect-slp.cc
View File

@ -7382,6 +7382,10 @@ vectorize_slp_instance_root_stmt (slp_tree node, slp_instance instance)
gimple *child_stmt = SLP_TREE_VEC_STMTS (node)[0];
tree vect_lhs = gimple_get_lhs (child_stmt);
tree root_lhs = gimple_get_lhs (instance->root_stmts[0]->stmt);
if (!useless_type_conversion_p (TREE_TYPE (root_lhs),
TREE_TYPE (vect_lhs)))
vect_lhs = build1 (VIEW_CONVERT_EXPR, TREE_TYPE (root_lhs),
vect_lhs);
rstmt = gimple_build_assign (root_lhs, vect_lhs);
}
else if (SLP_TREE_NUMBER_OF_VEC_STMTS (node) > 1)
@ -7392,6 +7396,9 @@ vectorize_slp_instance_root_stmt (slp_tree node, slp_instance instance)
vec<constructor_elt, va_gc> *v;
vec_alloc (v, nelts);
/* A CTOR can handle V16HI composition from VNx8HI so we
do not need to convert vector elements if the types
do not match. */
FOR_EACH_VEC_ELT (SLP_TREE_VEC_STMTS (node), j, child_stmt)
CONSTRUCTOR_APPEND_ELT (v, NULL_TREE,
gimple_get_lhs (child_stmt));