The early break vectorization store moving was incorrectly trying
to move the pattern stmt instead of the original one which failed
to register and then confused virtual SSA form due to the update
triggered by a degenerate virtual PHI.
Bootstrap and regtest running on x86_64-unknown-linux-gnu.
PR tree-optimization/120143
* tree-vect-data-refs.cc (vect_analyze_early_break_dependences):
Move/update the original stmts, not the pattern stmts which
lack virtual operands and are not in the IL.
* gcc.dg/vect/vect-early-break_135-pr120143.c: New testcase.
---
.../vect/vect-early-break_135-pr120143.c | 18 ++++++++++++++++++
gcc/tree-vect-data-refs.cc | 1 -
2 files changed, 18 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.dg/vect/vect-early-break_135-pr120143.c
diff --git a/gcc/testsuite/gcc.dg/vect/vect-early-break_135-pr120143.c
b/gcc/testsuite/gcc.dg/vect/vect-early-break_135-pr120143.c
new file mode 100644
index 00000000000..1ee30a821e2
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-early-break_135-pr120143.c
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-add-options vect_early_break } */
+/* { dg-additional-options "-O3 -fwhole-program" } */
+
+short a;
+extern _Bool b[][23];
+short g = 6;
+int v[4];
+int x[3];
+void c(short g, int v[], int x[]) {
+ for (;;)
+ for (unsigned y = 0; y < 023; y++) {
+ b[y][y] = v[y];
+ for (_Bool aa = 0; aa < (_Bool)g; aa = x[y])
+ a = a > 0;
+ }
+}
+int main() { c(g, v, x); }
diff --git a/gcc/tree-vect-data-refs.cc b/gcc/tree-vect-data-refs.cc
index 231a3cab4f8..9fd1ef29650 100644
--- a/gcc/tree-vect-data-refs.cc
+++ b/gcc/tree-vect-data-refs.cc
@@ -734,7 +734,6 @@ vect_analyze_early_break_dependences (loop_vec_info
loop_vinfo)
stmt_vec_info stmt_vinfo
= vect_stmt_to_vectorize (loop_vinfo->lookup_stmt (stmt));
- stmt = STMT_VINFO_STMT (stmt_vinfo);
auto dr_ref = STMT_VINFO_DATA_REF (stmt_vinfo);
if (!dr_ref)
continue;
--
2.43.0
