File: pr43540.ll

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llvm-toolchain-13 1%3A13.0.1-6~deb11u1
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; RUN: opt -S -licm -enable-mssa-loop-dependency=true %s | FileCheck %s
@v_1 = global i8 0, align 1
@v_2 =  global i8 0, align 1

; CHECK-LABEL: @foo()
; CHECK: for.cond:
; CHECK-NOT: store
; CHECK: for.body:
; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64
; CHECK: store
define void @foo() {
entry:
  br label %for.cond

for.cond:                                         ; preds = %for.body, %entry
  %0 = phi i16 [ %inc, %for.body ], [ 0, %entry ]
  %cmp = icmp slt i16 %0, 1
  br i1 %cmp, label %for.body, label %for.end

for.body:                                         ; preds = %for.cond
  call void @llvm.memcpy.p0i8.p0i8.i64(i8* @v_1, i8 * @v_2, i64 1, i1 false)
  store i8 1, i8 * @v_2, align 1
  %inc = add nsw i16 %0, 1
  br label %for.cond

for.end:                                          ; preds = %for.cond
  ret void
}

; Function Attrs: argmemonly nounwind willreturn
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8 * noalias nocapture readonly, i64, i1 immarg) #2

attributes #2 = { argmemonly nounwind willreturn }