New testcase for failure

llvm-svn: 1857

1 files changed, 25 insertions, 0 deletions

diff --git a/llvm/test/Regression/Other/2002-03-11-ConstPropCrash.ll b/llvm/test/Regression/Other/2002-03-11-ConstPropCrash.ll
new file mode 100644
index 00000000000..6eca6393787
--- /dev/null
+++ b/llvm/test/Regression/Other/2002-03-11-ConstPropCrash.ll
@@ -0,0 +1,25 @@
+; When constant propogating terminator instructions, the basic block iterator
+; was not updated to refer to the final position of the new terminator.  This
+; can be bad, f.e. because constproping a terminator can lead to the 
+; destruction of PHI nodes, which invalidates the iterator!
+;
+; Fixed by adding new arguments to ConstantFoldTerminator
+;
+; RUN: as < %s | opt -constprop
+
+implementation
+
+void "build_tree"(int %ml)
+begin
+	br label %bb2
+
+bb2:
+	%reg137 = phi int [ %reg140, %bb2 ], [ 12, %0 ]		; <int> [#uses=2]
+	%reg138 = phi uint [ %reg139, %bb2 ], [ 0, %0 ]		; <uint> [#uses=3]
+	%reg139 = add uint %reg138, 1		; <uint> [#uses=1]
+	%reg140 = add int %reg137, -1		; <int> [#uses=1]
+	br bool false, label %bb2, label %bb3
+
+bb3:
+	ret void
+end