diff mbox

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

Message ID F007E4D1AE275F468C186A52E051529CE4564F83@BADAG02.ba.imgtec.org
State New
Headers show

Commit Message

Doug Gilmore Oct. 1, 2016, 3 a.m. UTC 
It looks like my original message was dropped, resending -- Doug
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Patch

From d7a115e12856f2bcd4cefab38378f5d947c7d96a Mon Sep 17 00:00:00 2001
From: Doug Gilmore <doug.gilmore@imgtec.com>
Date: Fri, 30 Sep 2016 11:28:20 -0700
Subject: [PATCH] Fix PR tree-optimization/77808

gcc/
	PR tree-optimization/77808
	* tree-ssa-loop-prefetch.c (issue_prefetch_ref): Fix problem
	exposed by specifying --param prefetch-latency=0.

gcc/testsuite
	PR tree-optimization/77808
	* gcc.dg/tree-ssa/pr77808.c: New testcase.
---
 gcc/testsuite/gcc.dg/tree-ssa/pr77808.c | 11 +++++++++++
 gcc/tree-ssa-loop-prefetch.c            |  3 ++-
 2 files changed, 13 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/pr77808.c

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 0000000..85393f4
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr77808.c
@@ -0,0 +1,11 @@ 
+/* PR tree-optimization/77808 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fprefetch-loop-arrays --param prefetch-latency=0" } */
+
+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 056815d..43ee85a 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));
-- 
1.9.1