fix PR3217: fully cached queries need to be verified against the

visited set before they are used.  If used, their blocks need to be
added to the visited set so that subsequent queries don't use conflicting
pointer values in the cache result blocks.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61080 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 28 insertions, 0 deletions

diff --git a/test/Transforms/GVN/2008-12-15-CacheVisited.ll b/test/Transforms/GVN/2008-12-15-CacheVisited.ll
new file mode 100644
index 0000000..b547003
--- /dev/null
+++ b/test/Transforms/GVN/2008-12-15-CacheVisited.ll
@@ -0,0 +1,28 @@
+; RUN: llvm-as < %s | opt -gvn | llvm-dis
+; Cached results must be added to and verified against the visited sets.
+; PR3217
+
+define fastcc void @gen_field_die(i32* %decl) nounwind {
+entry:
+	br i1 false, label %bb203, label %bb202
+
+bb202:		; preds = %entry
+	unreachable
+
+bb203:		; preds = %entry
+	%tmp = getelementptr i32* %decl, i32 1		; <i32*> [#uses=1]
+	%tmp1 = load i32* %tmp, align 4		; <i32> [#uses=0]
+	br i1 false, label %bb207, label %bb204
+
+bb204:		; preds = %bb203
+	%tmp2 = getelementptr i32* %decl, i32 1		; <i32*> [#uses=1]
+	br label %bb208
+
+bb207:		; preds = %bb203
+	br label %bb208
+
+bb208:		; preds = %bb207, %bb204
+	%iftmp.1374.0.in = phi i32* [ null, %bb207 ], [ %tmp2, %bb204 ]		; <i32*> [#uses=1]
+	%iftmp.1374.0 = load i32* %iftmp.1374.0.in		; <i32> [#uses=0]
+	unreachable
+}