tree-optimization/120143 - ICE with failed early break store move

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.

	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.

(cherry picked from commit da377e7ebf84a05943fb768eaeb7d682dee865fa)

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 (file)
index 0000000..1ee30a8
--- /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 c9395e33fcdfc7deedd979c764daae93b15abace..3ba271b9e69273dbc7817a8e0b09e60af319c308 100644 (file)
--- 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;