Add some tests for shr-and folding

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

diff --git a/test/Transforms/InstCombine/and.ll b/test/Transforms/InstCombine/and.ll
index 703dea3326ccb7e567ec525c4ce86d90c8b5f327..ba30d816df1976d2c9025484dd5fc2be43bf4a35 100644 (file)
--- 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
+}