if (match(RHS, m_NUWAdd(m_Specific(LHS), m_APInt(C))))
return true;
+ // RHS >> V u<= RHS for any V
+ if (match(LHS, m_LShr(m_Specific(RHS), m_Value())))
+ return true;
+
// Match A to (X +_{nuw} CA) and B to (X +_{nuw} CB)
auto MatchNUWAddsToSameValue = [&](const Value *A, const Value *B,
const Value *&X,
; CHECK-LABEL: @test_shift(
; CHECK-NEXT: [[LSHR:%.*]] = lshr i64 [[X:%.*]], [[SHIFT:%.*]]
; CHECK-NEXT: [[ICMP1:%.*]] = icmp ugt i64 [[LSHR]], [[Y:%.*]]
-; CHECK-NEXT: [[ICMP2:%.*]] = icmp ugt i64 [[X]], [[Y]]
; CHECK-NEXT: call void @llvm.assume(i1 [[ICMP1]])
-; CHECK-NEXT: ret i1 [[ICMP2]]
+; CHECK-NEXT: ret i1 true
;
%lshr = lshr i64 %x, %shift
%icmp1 = icmp ugt i64 %lshr, %y
; i <u L ==> i >> C <u L
define i1 @lshr_constant(i32 %length.i, i32 %i) {
; CHECK-LABEL: @lshr_constant(
-; CHECK-NEXT: [[SHL:%.*]] = lshr i32 [[I:%.*]], 1
-; CHECK-NEXT: [[VAR29:%.*]] = icmp ult i32 [[I]], [[LENGTH_I:%.*]]
-; CHECK-NEXT: [[VAR30:%.*]] = icmp ult i32 [[SHL]], [[LENGTH_I]]
-; CHECK-NEXT: [[RES:%.*]] = icmp ule i1 [[VAR29]], [[VAR30]]
-; CHECK-NEXT: ret i1 [[RES]]
+; CHECK-NEXT: ret i1 true
;
%shl = lshr i32 %i, 1
%var29 = icmp ult i32 %i, %length.i
; i <u L ==> i >> V <u L
define i1 @lshr_value(i32 %length.i, i32 %i, i32 %v) {
; CHECK-LABEL: @lshr_value(
-; CHECK-NEXT: [[SHL:%.*]] = lshr i32 [[I:%.*]], [[V:%.*]]
-; CHECK-NEXT: [[VAR29:%.*]] = icmp ult i32 [[I]], [[LENGTH_I:%.*]]
-; CHECK-NEXT: [[VAR30:%.*]] = icmp ult i32 [[SHL]], [[LENGTH_I]]
-; CHECK-NEXT: [[RES:%.*]] = icmp ule i1 [[VAR29]], [[VAR30]]
-; CHECK-NEXT: ret i1 [[RES]]
+; CHECK-NEXT: ret i1 true
;
%shl = lshr i32 %i, %v
%var29 = icmp ult i32 %i, %length.i