llvm/test/Transforms/IndVarSimplify/constant_result.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=indvars -S | FileCheck %s

@Y = global [400 x i16] zeroinitializer, align 1

define i16 @foo() {
; CHECK-LABEL: @foo(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[I:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds [400 x i16], ptr @Y, i16 0, i16 [[I]]
; CHECK-NEXT:    store i16 0, ptr [[ARRAYIDX]], align 1
; CHECK-NEXT:    [[INC]] = add nuw nsw i16 [[I]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp samesign ult i16 [[INC]], 400
; CHECK-NEXT:    br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_END:%.*]]
; CHECK:       for.end:
; CHECK-NEXT:    ret i16 400
;
entry:
  br label %for.body

for.body:                                         ; preds = %entry, %for.body
  %i = phi i16 [ 0, %entry ], [ %inc, %for.body ]

  %arrayidx = getelementptr inbounds [400 x i16], ptr @Y, i16 0, i16 %i
  store i16 0, ptr %arrayidx, align 1
  %inc = add nuw nsw i16 %i, 1
  %cmp = icmp ult i16 %inc, 400
  br i1 %cmp, label %for.body, label %for.end

for.end:                                          ; preds = %for.body
  %inc.lcssa = phi i16 [ %inc, %for.body ]
  ret i16 %inc.lcssa
}