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* [gcc r10-10096] tree-optimization/101105 - fix runtime alias test optimization
@ 2021-09-06 10:18 Richard Biener
0 siblings, 0 replies; only message in thread
From: Richard Biener @ 2021-09-06 10:18 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:aed52ca415b635463116486865a2a55f947cf8c1
commit r10-10096-gaed52ca415b635463116486865a2a55f947cf8c1
Author: Richard Biener <rguenther@suse.de>
Date: Wed Jun 23 12:43:03 2021 +0200
tree-optimization/101105 - fix runtime alias test optimization
We were ignoring DR_STEP for VF == 1 which is OK only in case
the scalar order is preserved or both DR steps are the same.
2021-06-23 Richard Biener <rguenther@suse.de>
PR tree-optimization/101105
* tree-vect-data-refs.c (vect_prune_runtime_alias_test_list):
Only ignore steps when they are equal or scalar order is preserved.
* gcc.dg/torture/pr101105.c: New testcase.
(cherry picked from commit 50374fdacbd121bc4a61b073e559208ff61bee06)
Diff:
---
gcc/testsuite/gcc.dg/torture/pr101105.c | 19 +++++++++++++++++++
gcc/tree-vect-data-refs.c | 9 +++++++--
2 files changed, 26 insertions(+), 2 deletions(-)
diff --git a/gcc/testsuite/gcc.dg/torture/pr101105.c b/gcc/testsuite/gcc.dg/torture/pr101105.c
new file mode 100644
index 00000000000..9222351683d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr101105.c
@@ -0,0 +1,19 @@
+/* { dg-do run } */
+
+short a;
+int b[5][4] = {2, 2};
+int d;
+short e(int f) { return f == 0 || a && f == 1 ? 0 : a; }
+int main() {
+ int g, h;
+ g = 3;
+ for (; g >= 0; g--) {
+ h = 3;
+ for (; h >= 0; h--)
+ b[g][h] = b[0][1] && e(1);
+ }
+ d = b[0][1];
+ if (d != 0)
+ __builtin_abort ();
+ return 0;
+}
diff --git a/gcc/tree-vect-data-refs.c b/gcc/tree-vect-data-refs.c
index fcc0726bdbe..dd89436c44b 100644
--- a/gcc/tree-vect-data-refs.c
+++ b/gcc/tree-vect-data-refs.c
@@ -3457,9 +3457,9 @@ vect_prune_runtime_alias_test_list (loop_vec_info loop_vinfo)
/* Step values are irrelevant for aliasing if the number of vector
iterations is equal to the number of scalar iterations (which can
happen for fully-SLP loops). */
- bool ignore_step_p = known_eq (LOOP_VINFO_VECT_FACTOR (loop_vinfo), 1U);
+ bool vf_one_p = known_eq (LOOP_VINFO_VECT_FACTOR (loop_vinfo), 1U);
- if (!ignore_step_p)
+ if (!vf_one_p)
{
/* Convert the checks for nonzero steps into bound tests. */
tree value;
@@ -3512,6 +3512,11 @@ vect_prune_runtime_alias_test_list (loop_vec_info loop_vinfo)
bool preserves_scalar_order_p
= vect_preserves_scalar_order_p (dr_info_a, dr_info_b);
+ bool ignore_step_p
+ = (vf_one_p
+ && (preserves_scalar_order_p
+ || operand_equal_p (DR_STEP (dr_info_a->dr),
+ DR_STEP (dr_info_b->dr))));
/* Skip the pair if inter-iteration dependencies are irrelevant
and intra-iteration dependencies are guaranteed to be honored. */
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