From: Richard Biener <rguenther@suse.de>
Date: Thu, 14 Dec 2017 15:18:16 +0000 (+0000)
Subject: re PR tree-optimization/66974 (-Warray-bounds false positive with -O3)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c49dac0d87e288f3f0de73006f1d13ad930ff945;p=gcc.git

re PR tree-optimization/66974 (-Warray-bounds false positive with -O3)

2017-12-14  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/66974
	* gcc.dg/Warray-bounds-24.c: New testcase.

From-SVN: r255642
---

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 981c3a2771f..a053fcba4d0 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-12-14  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/66974
+	* gcc.dg/Warray-bounds-24.c: New testcase.
+
 2017-12-14  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/65258
diff --git a/gcc/testsuite/gcc.dg/Warray-bounds-24.c b/gcc/testsuite/gcc.dg/Warray-bounds-24.c
new file mode 100644
index 00000000000..35631737647
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Warray-bounds-24.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-O3 -Warray-bounds" } */
+
+int foo(unsigned order)
+{
+  int c[3] = {1, 2, 3};
+  unsigned i, j;
+  for (i = 1; i < order; i++) {
+      for (j = 0; j < i / 2; j++) {
+	  c[j] += c[i] * c[i-j-1]; /* { dg-bogus "array bounds" } */
+	  c[i-j-1] += c[i] * c[j]; /* { dg-bogus "array bounds" } */
+      }
+  }
+  return c[0];
+}