From: Richard Guenther <rguenther@suse.de>
Date: Thu, 4 Feb 2010 16:21:47 +0000 (+0000)
Subject: re PR rtl-optimization/42952 (possible integer wrong code bug)
X-Git-Tag: releases/gcc-4.3.5~190
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=532600833fbc3f30a9556177519379b7b60f7442;p=thirdparty%2Fgcc.git

re PR rtl-optimization/42952 (possible integer wrong code bug)

2010-02-04  Richard Guenther  <rguenther@suse.de>

	PR rtl-optimization/42952
	* dse.c (const_or_frame_p): Remove MEM handling.

	* gcc.dg/torture/pr42952.c: New testcase.

From-SVN: r156496
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 67438610a930..750cd0b65d20 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2010-02-04  Richard Guenther  <rguenther@suse.de>
+
+	PR rtl-optimization/42952
+	* dse.c (const_or_frame_p): Remove MEM handling.
+
 2010-01-31  Eric Botcazou  <ebotcazou@adacore.com>
 
 	PR middle-end/42898
diff --git a/gcc/dse.c b/gcc/dse.c
index a6de40b51d1a..9cd2948c4ab3 100644
--- a/gcc/dse.c
+++ b/gcc/dse.c
@@ -964,9 +964,6 @@ const_or_frame_p (rtx x)
 {
   switch (GET_CODE (x))
     {
-    case MEM:
-      return MEM_READONLY_P (x);
-
     case CONST:
     case CONST_INT:
     case CONST_DOUBLE:
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index ca235f90799f..bdebbf61556b 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-02-04  Richard Guenther  <rguenther@suse.de>
+
+	PR rtl-optimization/42952
+	* gcc.dg/torture/pr42952.c: New testcase.
+
 2010-01-31  Eric Botcazou  <ebotcazou@adacore.com>
 
 	PR middle-end/42898
diff --git a/gcc/testsuite/gcc.dg/torture/pr42952.c b/gcc/testsuite/gcc.dg/torture/pr42952.c
new file mode 100644
index 000000000000..db8782af3b9e
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr42952.c
@@ -0,0 +1,19 @@
+/* { dg-do run } */
+/* { dg-options "-fno-tree-ccp -fno-tree-fre" } */
+
+extern void abort (void);
+
+static int g[1];
+
+static int * const p = &g[0];
+static int * const q = &g[0];
+
+int main(void)
+{
+  g[0] = 1;
+  *p = 0;
+  *p = *q;
+  if (g[0] != 0)
+    abort ();
+  return 0;
+}