From: Richard Biener <rguenther@suse.de>
Date: Mon, 14 Apr 2014 08:11:08 +0000 (+0000)
Subject: re PR tree-optimization/55022 (air.f90 is miscompliled with -m64 -O2 -fgraphite-ident... 
X-Git-Tag: releases/gcc-5.1.0~8154
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a3c77ce941aeee074370680b38de3704d59983c6;p=thirdparty%2Fgcc.git

re PR tree-optimization/55022 (air.f90 is miscompliled with -m64 -O2 -fgraphite-identity after revision 190619)

2014-04-14  Richard Biener  <rguenther@suse.de>

	PR middle-end/55022
	* fold-const.c (negate_expr_p): Don't negate directional rounding
	division.
	(fold_negate_expr): Likewise.

	* gcc.dg/graphite/pr55022.c: New testcase.

From-SVN: r209356
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a80c21f27dec..3991750539f1 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2014-04-14  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/55022
+	* fold-const.c (negate_expr_p): Don't negate directional rounding
+	division.
+	(fold_negate_expr): Likewise.
+
 2014-04-14  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/59817
diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 891c0d5151cb..5c2bf256c2a9 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -484,8 +484,6 @@ negate_expr_p (tree t)
 
     case TRUNC_DIV_EXPR:
     case ROUND_DIV_EXPR:
-    case FLOOR_DIV_EXPR:
-    case CEIL_DIV_EXPR:
     case EXACT_DIV_EXPR:
       /* In general we can't negate A / B, because if A is INT_MIN and
 	 B is 1, we may turn this into INT_MIN / -1 which is undefined
@@ -682,8 +680,6 @@ fold_negate_expr (location_t loc, tree t)
 
     case TRUNC_DIV_EXPR:
     case ROUND_DIV_EXPR:
-    case FLOOR_DIV_EXPR:
-    case CEIL_DIV_EXPR:
     case EXACT_DIV_EXPR:
       /* In general we can't negate A / B, because if A is INT_MIN and
 	 B is 1, we may turn this into INT_MIN / -1 which is undefined
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index e09c499db71a..6992ad60f698 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2014-04-14  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/55022
+	* gcc.dg/graphite/pr55022.c: New testcase.
+
 2014-04-14  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/59817
diff --git a/gcc/testsuite/gcc.dg/graphite/pr55022.c b/gcc/testsuite/gcc.dg/graphite/pr55022.c
new file mode 100644
index 000000000000..c631c0e23e68
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/graphite/pr55022.c
@@ -0,0 +1,27 @@
+/* { dg-do run } */
+/* { dg-options "-O2 -fgraphite-identity" } */
+
+extern void abort (void);
+
+void __attribute__((noinline,noclone))
+f(int *limit, int minLen, int maxLen)
+{
+  int i;
+
+  for (i = minLen; i <= maxLen; i++) {
+      limit[i] = i;
+  }
+}
+
+int main()
+{
+  int limit[256], i;
+  f (limit, 0, 255);
+  for (i = 0; i < 256; ++i)
+    {
+      if (limit[i] != i)
+	abort ();
+      __asm__ volatile ("" : : : "memory");
+    }
+  return 0;
+}