New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2705 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/SCCP/2002-05-21-InvalidSimplify.ll b/test/Transforms/SCCP/2002-05-21-InvalidSimplify.ll
new file mode 100644 (file)
index 0000000..b8c03b2
--- /dev/null
+++ b/test/Transforms/SCCP/2002-05-21-InvalidSimplify.ll
@@ -0,0 +1,39 @@
+; This test shows SCCP "proving" that the loop (from bb6 to 14) loops infinitely
+; this is in fact NOT the case, so the return should still be alive in the code
+; after sccp and CFG simplification have been performed.
+;
+; RUN: as < %s | opt -sccp -simplifycfg | dis | grep ret
+
+
+void "old_main"() {
+bb3:                                   ;[#uses=1]
+       br label %bb6
+
+bb6:                                   ;[#uses=3]
+       %reg403 = phi int [ %reg155, %bb14 ], [ 0, %bb3 ]               ; <int> [#uses=2]
+       %reg155 = add int %reg403, 1            ; <int> [#uses=3]
+
+       br label %bb11
+
+bb11:
+        %reg407 = phi int [ %reg408, %bb11 ], [ 0, %bb6 ]              ; <int> [#uses=2]
+        %reg408 = add int %reg407, 1            ; <int> [#uses=2]
+        %cond550 = setle int %reg407, 1         ; <bool> [#uses=1]
+        br bool %cond550, label %bb11, label %bb12
+
+bb12:                                  ;[#uses=2]
+       br label %bb13
+
+bb13:                                  ;[#uses=3]
+       %reg409 = phi int [ %reg410, %bb13 ], [ 0, %bb12 ]              ; <int> [#uses=1]
+       %reg410 = add int %reg409, 1            ; <int> [#uses=2]
+       %cond552 = setle int %reg410, 2         ; <bool> [#uses=1]
+       br bool %cond552, label %bb13, label %bb14
+
+bb14:                                  ;[#uses=2]
+       %cond553 = setle int %reg155, 31                ; <bool> [#uses=1]
+       br bool %cond553, label %bb6, label %bb15
+
+bb15:                                  ;[#uses=1]
+       ret void
+}