Add some tests for shr-and folding

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16507 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 17 insertions, 0 deletions

diff --git a/test/Transforms/InstCombine/and.ll b/test/Transforms/InstCombine/and.ll
index 703dea3326..ba30d816df 100644
--- a/test/Transforms/InstCombine/and.ll
+++ b/test/Transforms/InstCombine/and.ll
@@ -119,3 +119,20 @@ bool %test18(int %A) {
 	ret bool %C
 }
 
+int %test19(int %A) {
+	%B = shl int %A, ubyte 3
+	%C = and int %B, -2    ;; Clearing a zero bit
+	ret int %C
+}
+
+ubyte %test20(ubyte %A) {
+	%C = shr ubyte %A, ubyte 7 
+	%D = and ubyte %C, 1            ;; Unneeded
+	ret ubyte %D
+}
+
+sbyte %test21(sbyte %A) {
+	%C = shr sbyte %A, ubyte 7   ;; sign extend
+	%D = and sbyte %C, 1         ;; chop off sign
+	ret sbyte %D
+}