* [PATCH] tree-optimization/107302 - fix vec_perm placement for recurrence vect
@ 2022-10-18 10:47 Richard Biener
0 siblings, 0 replies; only message in thread
From: Richard Biener @ 2022-10-18 10:47 UTC (permalink / raw)
To: gcc-patches
The following fixes the VEC_PERM_EXPR placement when the latch
definition is a PHI node.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
PR tree-optimization/107302
* tree-vect-loop.cc (vectorizable_recurrence): Fix vec_perm
placement for a PHI latch def.
* gcc.dg/vect/pr107302.c: New testcase.
---
gcc/testsuite/gcc.dg/vect/pr107302.c | 13 +++++++++++++
gcc/tree-vect-loop.cc | 12 +++++++++---
2 files changed, 22 insertions(+), 3 deletions(-)
create mode 100644 gcc/testsuite/gcc.dg/vect/pr107302.c
diff --git a/gcc/testsuite/gcc.dg/vect/pr107302.c b/gcc/testsuite/gcc.dg/vect/pr107302.c
new file mode 100644
index 00000000000..293f7e4067a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/pr107302.c
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-fno-tree-pre" } */
+
+int a[2000];
+int s292_im1;
+
+void
+s292() {
+ for (int i = 0; i < 2000; i++) {
+ a[i] = s292_im1;
+ s292_im1 = i;
+ }
+}
diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 63e86540d12..92790bd8095 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -8485,9 +8485,15 @@ vectorizable_recurr (loop_vec_info loop_vinfo, stmt_vec_info stmt_info,
second and later operands are tentative and will be updated when we have
vectorized the latch definition. */
edge le = loop_latch_edge (LOOP_VINFO_LOOP (loop_vinfo));
- gimple_stmt_iterator gsi2
- = gsi_for_stmt (SSA_NAME_DEF_STMT (PHI_ARG_DEF_FROM_EDGE (phi, le)));
- gsi_next (&gsi2);
+ gimple *latch_def = SSA_NAME_DEF_STMT (PHI_ARG_DEF_FROM_EDGE (phi, le));
+ gimple_stmt_iterator gsi2;
+ if (is_a <gphi *> (latch_def))
+ gsi2 = gsi_after_labels (gimple_bb (latch_def));
+ else
+ {
+ gsi2 = gsi_for_stmt (latch_def);
+ gsi_next (&gsi2);
+ }
for (unsigned i = 0; i < ncopies; ++i)
{
--
2.35.3
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