[Reassociate] Add tests with disjoint OR.

Author: fhahn

llvm/test/Transforms/Reassociate/or-disjoint.ll

@@ -0,0 +1,37 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -passes=reassociate -S %s | FileCheck %s
+
+
+define i16 @or_disjoint_both(i16 %a, i16 %b) {
+; CHECK-LABEL: @or_disjoint_both(
+; CHECK-NEXT:    [[OR_1:%.*]] = or i16 [[A:%.*]], 1
+; CHECK-NEXT:    [[OR_2:%.*]] = or i16 [[OR_1]], [[B:%.*]]
+; CHECK-NEXT:    ret i16 [[OR_2]]
+;
+  %or.1 = or disjoint i16 %b, %a
+  %or.2 = or disjoint i16 %or.1, 1
+  ret i16 %or.2
+}
+
+define i16 @or_disjoint_first(i16 %a, i16 %b) {
+; CHECK-LABEL: @or_disjoint_first(
+; CHECK-NEXT:    [[OR_1:%.*]] = or i16 [[A:%.*]], 1
+; CHECK-NEXT:    [[OR_2:%.*]] = or i16 [[OR_1]], [[B:%.*]]
+; CHECK-NEXT:    ret i16 [[OR_2]]
+;
+  %or.1 = or i16 %b, %a
+  %or.2 = or disjoint i16 %or.1, 1
+  ret i16 %or.2
+}
+
+define i16 @or_disjoint_last(i16 %a, i16 %b) {
+; CHECK-LABEL: @or_disjoint_last(
+; CHECK-NEXT:    [[OR_1:%.*]] = or i16 [[A:%.*]], 1
+; CHECK-NEXT:    [[OR_2:%.*]] = or i16 [[OR_1]], [[B:%.*]]
+; CHECK-NEXT:    ret i16 [[OR_2]]
+;
+  %or.1 = or disjoint i16 %b, %a
+  %or.2 = or i16 %or.1, 1
+  ret i16 %or.2
+}
+