[InstCombine] Add a test case to show a case where don't handle a partially commuted...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305438 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/onehot_merge.ll b/test/Transforms/InstCombine/onehot_merge.ll
index 496d847b5321e0ec91ae2b214889261b9642e7dd..6fd4fc66a52f1aaafc291d2e50a3c4a2dab086ec 100644 (file)
--- a/test/Transforms/InstCombine/onehot_merge.ll
+++ b/test/Transforms/InstCombine/onehot_merge.ll
@@ -33,3 +33,30 @@ bb:
   ret i1 %or
 }
 
+; Same as above but with operands commuted one of the ands, but not the other.
+; TODO handle this form correctly
+define i1 @foo1_and_commuted(i32 %k, i32 %c1, i32 %c2) {
+; CHECK-LABEL: @foo1_and_commuted(
+; CHECK-NEXT:  bb:
+; CHECK-NEXT:    [[K2:%.*]] = mul i32 [[K:%.*]], [[K]]
+; CHECK-NEXT:    [[TMP:%.*]] = shl i32 1, [[C1:%.*]]
+; CHECK-NEXT:    [[TMP4:%.*]] = lshr i32 -2147483648, [[C2:%.*]]
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[K2]], [[TMP]]
+; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i32 [[TMP1]], 0
+; CHECK-NEXT:    [[TMP5:%.*]] = and i32 [[TMP4]], [[K2]]
+; CHECK-NEXT:    [[TMP6:%.*]] = icmp eq i32 [[TMP5]], 0
+; CHECK-NEXT:    [[OR:%.*]] = or i1 [[TMP2]], [[TMP6]]
+; CHECK-NEXT:    ret i1 [[OR]]
+;
+bb:
+  %k2 = mul i32 %k, %k ; to trick the complexity sorting
+  %tmp = shl i32 1, %c1
+  %tmp4 = lshr i32 -2147483648, %c2
+  %tmp1 = and i32 %k2, %tmp
+  %tmp2 = icmp eq i32 %tmp1, 0
+  %tmp5 = and i32 %tmp4, %k2
+  %tmp6 = icmp eq i32 %tmp5, 0
+  %or = or i1 %tmp2, %tmp6
+  ret i1 %or
+}
+