New testcase for wierd combine opportunity found in bzip2 benchmark

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2580 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/set.ll b/test/Transforms/InstCombine/set.ll
index 264bb353c315e79a298d1f562579583629f5c375..3fd94c31a41296a193ea486cae8efb514c768bf7 100644 (file)
--- a/test/Transforms/InstCombine/set.ll
+++ b/test/Transforms/InstCombine/set.ll
@@ -6,16 +6,20 @@
 ; RUN: else exit 0
 ; RUN: fi
 
-implementation
+%X = uninitialized global int
 
 bool "test1"(int %A) {
        %B = seteq int %A, %A
-       ret bool %B
+       %C = seteq int* %X, null   ; Never true
+       %D = and bool %B, %C
+       ret bool %D
 }
 
 bool "test2"(int %A) {
        %B = setne int %A, %A
-       ret bool %B
+       %C = setne int* %X, null   ; Never false
+       %D = or bool %B, %C
+       ret bool %D
 }
 
 bool "test3"(int %A) {