From: Richard Biener <rguenther@suse.de>
Date: Mon, 28 Oct 2019 13:43:49 +0000 (+0000)
Subject: re PR tree-optimization/92252 (ICE: Segmentation fault (in vect_stmt_to_vectorize))
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=96d9d1620f28517de0464ab636662d9a35a92993;p=gcc.git

re PR tree-optimization/92252 (ICE: Segmentation fault (in vect_stmt_to_vectorize))

2019-10-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92252
	* tree-vect-slp.c (vect_get_and_check_slp_defs): Adjust
	STMT_VINFO_REDUC_IDX when swapping operands.

	* gcc.dg/torture/pr92252.c: New testcase.

From-SVN: r277517
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 98090400569..c9daad995d7 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2019-10-28  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/92252
+	* tree-vect-slp.c (vect_get_and_check_slp_defs): Adjust
+	STMT_VINFO_REDUC_IDX when swapping operands.
+
 2019-10-28  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/92241
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 41dea35bdc6..5d1ddbe4146 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2019-10-28  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/92252
+	* gcc.dg/torture/pr92252.c: New testcase.
+
 2019-10-28  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/92241
diff --git a/gcc/testsuite/gcc.dg/torture/pr92252.c b/gcc/testsuite/gcc.dg/torture/pr92252.c
new file mode 100644
index 00000000000..eea60a044f7
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr92252.c
@@ -0,0 +1,23 @@
+/* { do-do compile } */
+/* { dg-additional-options "-ftree-vectorize" } */
+
+long int ar;
+int dt;
+
+long int
+pc (unsigned long int q3, int zw)
+{
+  long int em = 0;
+
+  while (zw < 1)
+    {
+      q3 = zw * 2ul;
+      if (q3 != 0)
+        for (ar = 0; ar < 2; ++ar)
+          em = dt;
+
+      ++zw;
+    }
+
+  return em;
+}
diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c
index e32731b6db1..b75594c36e9 100644
--- a/gcc/tree-vect-slp.c
+++ b/gcc/tree-vect-slp.c
@@ -563,6 +563,10 @@ again:
 	    {
 	      swap_ssa_operands (stmt, gimple_assign_rhs2_ptr (stmt),
 				 gimple_assign_rhs3_ptr (stmt));
+	      if (STMT_VINFO_REDUC_IDX (stmt_info) == 1)
+		STMT_VINFO_REDUC_IDX (stmt_info) = 2;
+	      else if (STMT_VINFO_REDUC_IDX (stmt_info) == 2)
+		STMT_VINFO_REDUC_IDX (stmt_info) = 1;
 	      bool honor_nans = HONOR_NANS (TREE_OPERAND (cond, 0));
 	      code = invert_tree_comparison (TREE_CODE (cond), honor_nans);
 	      gcc_assert (code != ERROR_MARK);