llvm-project/llvm/test/Analysis/LazyValueAnalysis/invalidation.ll

; Test that the lazy value analysis gets invalidated when its dependencies go
; away. Sadly, you can neither print nor verify LVI so we just have to require
; it and check that the pass manager does the right thing.
;
; Check basic invalidation.
; RUN: opt -disable-output -disable-verify -debug-pass-manager %s 2>&1 \
; RUN:     -passes='require<lazy-value-info>,invalidate<lazy-value-info>,require<lazy-value-info>' \
; RUN:     | FileCheck %s --check-prefix=CHECK-INVALIDATE
; CHECK-INVALIDATE: Running pass: RequireAnalysisPass
; CHECK-INVALIDATE: Running analysis: LazyValueAnalysis
; CHECK-INVALIDATE: Running pass: InvalidateAnalysisPass
; CHECK-INVALIDATE: Invalidating analysis: LazyValueAnalysis
; CHECK-INVALIDATE: Running pass: RequireAnalysisPass
; CHECK-INVALIDATE: Running analysis: LazyValueAnalysis

target triple = "x86_64-unknown-linux-gnu"

@.str = private unnamed_addr constant [8 x i8] c"a = %l\0A\00", align 1

declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture)

declare void @hoo(i64*)

declare i32 @printf(i8* nocapture readonly, ...)

declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture)

define void @goo(i32 %N, i64* %b) {
entry:
  %a.i = alloca i64, align 8
  %tmp = bitcast i64* %a.i to i8*
  %c = getelementptr inbounds i64, i64* %b, i64 0
  br label %for.cond

for.cond:                                         ; preds = %for.body, %entry
  %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
  %cmp = icmp slt i32 %i.0, %N
  br i1 %cmp, label %for.body, label %for.end

for.body:                                         ; preds = %for.cond
  call void @llvm.lifetime.start.p0i8(i64 8, i8* %tmp)
  call void @hoo(i64* %a.i)
  call void @hoo(i64* %c)
  %tmp1 = load volatile i64, i64* %a.i, align 8
  %call.i = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i64 %tmp1)
  call void @llvm.lifetime.end.p0i8(i64 8, i8* %tmp)
  %inc = add nsw i32 %i.0, 1
  br label %for.cond

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