; LLVM IR from LeoVen/C-Macro-Collections :: examples (dfs)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.Stack = type { ptr, i64, i64, i32, ptr, ptr }
%struct.StackFVal = type { ptr, ptr, ptr, ptr, ptr, ptr }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local zeroext i1 @stk_contains(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i8, align 1
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.Stack, ptr %8, i32 0, i32 3
  store i32 0, ptr %9, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 1, ptr %5) #2
  store i8 0, ptr %5, align 1, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 0, ptr %6, align 8, !tbaa !15
  br label %10

10:                                               ; preds = %34, %2
  %11 = load i64, ptr %6, align 8, !tbaa !15
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.Stack, ptr %12, i32 0, i32 2
  %14 = load i64, ptr %13, align 8, !tbaa !16
  %15 = icmp ult i64 %11, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %10
  store i32 2, ptr %7, align 4
  br label %37

17:                                               ; preds = %10
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.Stack, ptr %18, i32 0, i32 4
  %20 = load ptr, ptr %19, align 8, !tbaa !17
  %21 = getelementptr inbounds %struct.StackFVal, ptr %20, i32 0, i32 0
  %22 = load ptr, ptr %21, align 8, !tbaa !18
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.Stack, ptr %23, i32 0, i32 0
  %25 = load ptr, ptr %24, align 8, !tbaa !20
  %26 = load i64, ptr %6, align 8, !tbaa !15
  %27 = getelementptr inbounds ptr, ptr %25, i64 %26
  %28 = load ptr, ptr %27, align 8, !tbaa !5
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = call i32 %22(ptr noundef %28, ptr noundef %29)
  %31 = icmp eq i32 %30, 0
  br i1 %31, label %32, label %33

32:                                               ; preds = %17
  store i8 1, ptr %5, align 1, !tbaa !13
  store i32 2, ptr %7, align 4
  br label %37

33:                                               ; preds = %17
  br label %34

34:                                               ; preds = %33
  %35 = load i64, ptr %6, align 8, !tbaa !15
  %36 = add i64 %35, 1
  store i64 %36, ptr %6, align 8, !tbaa !15
  br label %10, !llvm.loop !21

37:                                               ; preds = %32, %16
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %38

38:                                               ; preds = %37
  %39 = load i8, ptr %5, align 1, !tbaa !13, !range !23, !noundef !24
  %40 = trunc i8 %39 to i1
  store i32 1, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 1, ptr %5) #2
  ret i1 %40
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !12, i64 24}
!10 = !{!"Stack", !6, i64 0, !11, i64 8, !11, i64 16, !12, i64 24, !6, i64 32, !6, i64 40}
!11 = !{!"long", !7, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!14, !14, i64 0}
!14 = !{!"_Bool", !7, i64 0}
!15 = !{!11, !11, i64 0}
!16 = !{!10, !11, i64 16}
!17 = !{!10, !6, i64 32}
!18 = !{!19, !6, i64 0}
!19 = !{!"StackFVal", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !6, i64 32, !6, i64 40}
!20 = !{!10, !6, i64 0}
!21 = distinct !{!21, !22}
!22 = !{!"llvm.loop.mustprogress"}
!23 = !{i8 0, i8 2}
!24 = !{}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: nounwind uwtable
define dso_local noundef zeroext i1 @stk_contains(ptr nocapture noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 24
  store i32 0, ptr %3, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %0, i64 32
  %5 = getelementptr inbounds i8, ptr %0, i64 16
  %6 = load i64, ptr %5, align 8, !tbaa !12
  %.not = icmp eq i64 %6, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

7:                                                ; preds = %.lr.ph
  %8 = add nuw i64 %.09, 1
  %9 = load i64, ptr %5, align 8, !tbaa !12
  %10 = icmp ult i64 %8, %9
  br i1 %10, label %.lr.ph, label %._crit_edge, !llvm.loop !13

.lr.ph:                                           ; preds = %2, %7
  %.09 = phi i64 [ %8, %7 ], [ 0, %2 ]
  %11 = load ptr, ptr %4, align 8, !tbaa !15
  %12 = load ptr, ptr %11, align 8, !tbaa !16
  %13 = load ptr, ptr %0, align 8, !tbaa !18
  %14 = getelementptr inbounds ptr, ptr %13, i64 %.09
  %15 = load ptr, ptr %14, align 8, !tbaa !19
  %16 = tail call i32 %12(ptr noundef %15, ptr noundef %1) #1
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %._crit_edge, label %7

._crit_edge:                                      ; preds = %7, %.lr.ph, %2
  %.lcssa = phi i1 [ false, %2 ], [ %17, %.lr.ph ], [ %17, %7 ]
  ret i1 %.lcssa
}

attributes #0 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !11, i64 24}
!6 = !{!"Stack", !7, i64 0, !10, i64 8, !10, i64 16, !11, i64 24, !7, i64 32, !7, i64 40}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"long", !8, i64 0}
!11 = !{!"int", !8, i64 0}
!12 = !{!6, !10, i64 16}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!6, !7, i64 32}
!16 = !{!17, !7, i64 0}
!17 = !{!"StackFVal", !7, i64 0, !7, i64 8, !7, i64 16, !7, i64 24, !7, i64 32, !7, i64 40}
!18 = !{!6, !7, i64 0}
!19 = !{!7, !7, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass