[EarlyCSE] add test for select condition double-negation; NFC
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358444 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Transforms/EarlyCSE/commute.ll b/test/Transforms/EarlyCSE/commute.ll
index e7a1cfc..df092fc 100644
--- a/test/Transforms/EarlyCSE/commute.ll
+++ b/test/Transforms/EarlyCSE/commute.ll
@@ -451,3 +451,24 @@
%r = xor i32 %m2, %m1
ret i32 %r
}
+
+; TODO: If we have both an inverted predicate and a 'not' op, recognize the double-negation.
+
+define i32 @select_not_invert_pred_cond(i8 %x, i32 %t, i32 %f) {
+; CHECK-LABEL: @select_not_invert_pred_cond(
+; CHECK-NEXT: [[COND:%.*]] = icmp ugt i8 [[X:%.*]], 42
+; CHECK-NEXT: [[INVCOND:%.*]] = icmp ule i8 [[X]], 42
+; CHECK-NEXT: [[NOT:%.*]] = xor i1 [[INVCOND]], true
+; CHECK-NEXT: [[M1:%.*]] = select i1 [[COND]], i32 [[T:%.*]], i32 [[F:%.*]]
+; CHECK-NEXT: [[M2:%.*]] = select i1 [[NOT]], i32 [[T]], i32 [[F]]
+; CHECK-NEXT: [[R:%.*]] = xor i32 [[M1]], [[M2]]
+; CHECK-NEXT: ret i32 [[R]]
+;
+ %cond = icmp ugt i8 %x, 42
+ %invcond = icmp ule i8 %x, 42
+ %not = xor i1 %invcond, -1
+ %m1 = select i1 %cond, i32 %t, i32 %f
+ %m2 = select i1 %not, i32 %t, i32 %f
+ %r = xor i32 %m1, %m2
+ ret i32 %r
+}
