File: pr22179.ll

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llvm-toolchain-20 1%3A20.1.6-1~exp1
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; RUN: opt -disable-output "-passes=print<scalar-evolution>" < %s 2>&1 | FileCheck %s

%struct.anon = type { i8 }
%struct.S = type { i32 }

@a = common global %struct.anon zeroinitializer, align 1
@b = common global %struct.S zeroinitializer, align 4

; Function Attrs: nounwind ssp uwtable
define i32 @main() {
; CHECK-LABEL: Classifying expressions for: @main
  store i8 0, ptr @a, align 1
  br label %loop

loop:
  %storemerge1 = phi i8 [ 0, %0 ], [ %inc, %loop ]
  %m = load volatile i32, ptr @b, align 4
  %inc = add nuw i8 %storemerge1, 1
; CHECK:   %inc = add nuw i8 %storemerge1, 1
; CHECK-NEXT: -->  {1,+,1}<nuw><%loop>
; CHECK-NOT: -->  {1,+,1}<nuw><nsw><%loop>
  %exitcond = icmp eq i8 %inc, -128
  br i1 %exitcond, label %exit, label %loop

exit:
  store i8 -128, ptr @a, align 1
  ret i32 0
}