1 files changed, 107 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/pr18241-1.c b/gcc/testsuite/gcc.dg/pr18241-1.c
new file mode 100644
index 00000000000..99c9e38e615
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr18241-1.c
@@ -0,0 +1,107 @@
+/* { dg-do run } */
+/* { dg-options "-std=gnu99 -Wall -Wextra -O1" } */ 
+
+extern void *memset (void*, int, unsigned long);
+extern void abort (void);
+
+struct radix_tree_root {
+	unsigned int height;
+	struct radix_tree_node *rnode;
+};
+
+struct radix_tree_node {
+	unsigned int count;
+	void *slots[64];
+	unsigned long tags[2][2];
+};
+
+struct radix_tree_path {
+	struct radix_tree_node *node, **slot;
+	int offset;
+};
+
+static unsigned long height_to_maxindex[7] =
+{0, 63, 4095, 262143, 16777215, 1073741823, 4294967295};
+
+static inline void tag_clear(struct radix_tree_node *node, int tag, int offset)
+{
+	int nr;
+	volatile unsigned long *addr;
+	int mask;
+	
+	nr = offset;
+	addr = &node->tags[tag][0];
+
+	addr += nr >> 5;
+	mask = 1 << (nr & 0x1f);
+	*addr &= ~mask;
+}
+
+void *radix_tree_tag_clear(struct radix_tree_root *root, unsigned long index, int tag)
+{
+	struct radix_tree_path path[7], *pathp = path;
+	unsigned int height, shift;
+	void *ret = 0;
+	
+	height = root->height;
+	if (index > height_to_maxindex[height])
+		goto out;
+	
+	shift = (height - 1) * 6;
+	pathp->node = 0;
+	pathp->slot = &root->rnode;
+	
+	while (height > 0) {
+		int offset;
+		
+		if (*pathp->slot == 0)
+			goto out;
+		
+		offset = (index >> shift) & (64-1);
+		pathp[1].offset = offset;
+		pathp[1].node = *pathp[0].slot;
+		pathp[1].slot = (struct radix_tree_node **)
+			(pathp[1].node->slots + offset);
+		pathp++;
+		shift -= 6;
+		height--;
+	}
+	
+	ret = *pathp[0].slot;
+	if (ret == 0)
+		goto out;
+	
+	do {
+		int idx;
+		
+		tag_clear(pathp[0].node, tag, pathp[0].offset);
+		for (idx = 0; idx < 2; idx++) {
+			if (pathp[0].node->tags[tag][idx])
+				goto out;
+		}
+		pathp--;
+	} while (pathp[0].node);
+out:
+	return ret;
+}
+
+int main ()
+{
+	struct radix_tree_root r;
+	struct radix_tree_node node;
+	void *p = (void *) 0xdeadbeef;
+	
+  	r.height = 1;
+	r.rnode = &node;
+	
+	memset (&node, 0, sizeof (node));
+	
+	node.count = 1;
+	node.slots [13] = p;
+	
+	radix_tree_tag_clear (&r, 13, 1);
+	
+	if (r.rnode->slots[13] != p)
+		abort ();
+	return 0;
+}