From: Doug Gilmore <doug.gilmore@imgtec.com>
Date: Tue, 4 Oct 2016 15:28:23 +0000 (+0000)
Subject: re PR tree-optimization/77808 (ICE in duplicate_ssa_name_ptr_info, at tree-ssanames... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fe8b1e839ca91a61440288049a868944346eef4b;p=gcc.git

re PR tree-optimization/77808 (ICE in duplicate_ssa_name_ptr_info, at tree-ssanames.c:630 starting with r240439)

Fix PR tree-optimization/77808

gcc/
	PR tree-optimization/77808
	* tree-ssa-loop-prefetch.c (issue_prefetch_ref): Check base_addr
	and addr are different before copying points-to information.

gcc/testsuite/
	PR tree-optimization/77808
	* gcc.dg/tree-ssa/pr77808.c: New testcase.

From-SVN: r240749
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 94c301d1a57..3be8781adbf 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2016-10-04  Doug Gilmore  <doug.gilmore@imgtec.com>
+
+	PR tree-optimization/77808
+	* tree-ssa-loop-prefetch.c (issue_prefetch_ref): Check base_addr
+	and addr are different before copying points-to information.
+
 2016-10-04  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/x86-tune.def (X86_TUNE_VECTORIZE_DOUBLE): Remove.
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index c6b9d87c5ab..41c2f381c86 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2016-10-04  Doug Gilmore  <doug.gilmore@imgtec.com>
+
+	PR tree-optimization/77808
+	* gcc.dg/tree-ssa/pr77808.c: New testcase.
+
 2016-10-04  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/77399
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr77808.c b/gcc/testsuite/gcc.dg/tree-ssa/pr77808.c
new file mode 100644
index 00000000000..6c806ec9aca
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr77808.c
@@ -0,0 +1,11 @@
+/* PR tree-optimization/77808 */
+/* { dg-options "-O2 -fprefetch-loop-arrays --param prefetch-latency=0 -w" } */
+
+void
+daxpy(int n, double da, double * __restrict dx, double * __restrict dy)
+{
+  int i;
+
+  for (i = 0;i < n; i++)
+    dy[i] = dy[i] + da*dx[i];
+}
diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c
index 056815de9e1..43ee85aae92 100644
--- a/gcc/tree-ssa-loop-prefetch.c
+++ b/gcc/tree-ssa-loop-prefetch.c
@@ -1162,7 +1162,8 @@ issue_prefetch_ref (struct mem_ref *ref, unsigned unroll_factor, unsigned ahead)
 					   NULL, true, GSI_SAME_STMT);
       }
 
-      if (TREE_CODE (addr_base) == SSA_NAME
+      if (addr_base != addr
+	  && TREE_CODE (addr_base) == SSA_NAME
 	  && TREE_CODE (addr) == SSA_NAME)
 	{
 	  duplicate_ssa_name_ptr_info (addr, SSA_NAME_PTR_INFO (addr_base));