; LLVM IR from gzc/CLRS :: C15-Dynamic-Programming/lincrs.ll (Z4findPiii)

; 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"

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z4findPiii(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 0, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %12 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %12, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %13 = load i32, ptr %8, align 4, !tbaa !9
  %14 = load i32, ptr %9, align 4, !tbaa !9
  %15 = add nsw i32 %13, %14
  %16 = sdiv i32 %15, 2
  store i32 %16, ptr %10, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %46, %3
  %18 = load i32, ptr %8, align 4, !tbaa !9
  %19 = load i32, ptr %9, align 4, !tbaa !9
  %20 = icmp sle i32 %18, %19
  br i1 %20, label %21, label %51

21:                                               ; preds = %17
  %22 = load i32, ptr %7, align 4, !tbaa !9
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  %24 = load i32, ptr %10, align 4, !tbaa !9
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds i32, ptr %23, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !9
  %28 = icmp sgt i32 %22, %27
  br i1 %28, label %29, label %32

29:                                               ; preds = %21
  %30 = load i32, ptr %10, align 4, !tbaa !9
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %8, align 4, !tbaa !9
  br label %46

32:                                               ; preds = %21
  %33 = load i32, ptr %7, align 4, !tbaa !9
  %34 = load ptr, ptr %5, align 8, !tbaa !5
  %35 = load i32, ptr %10, align 4, !tbaa !9
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds i32, ptr %34, i64 %36
  %38 = load i32, ptr %37, align 4, !tbaa !9
  %39 = icmp slt i32 %33, %38
  br i1 %39, label %40, label %43

40:                                               ; preds = %32
  %41 = load i32, ptr %10, align 4, !tbaa !9
  %42 = sub nsw i32 %41, 1
  store i32 %42, ptr %9, align 4, !tbaa !9
  br label %45

43:                                               ; preds = %32
  %44 = load i32, ptr %10, align 4, !tbaa !9
  store i32 %44, ptr %4, align 4
  store i32 1, ptr %11, align 4
  br label %53

45:                                               ; preds = %40
  br label %46

46:                                               ; preds = %45, %29
  %47 = load i32, ptr %8, align 4, !tbaa !9
  %48 = load i32, ptr %9, align 4, !tbaa !9
  %49 = add nsw i32 %47, %48
  %50 = sdiv i32 %49, 2
  store i32 %50, ptr %10, align 4, !tbaa !9
  br label %17, !llvm.loop !11

51:                                               ; preds = %17
  %52 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %52, ptr %4, align 4
  store i32 1, ptr %11, align 4
  br label %53

53:                                               ; preds = %51, %43
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  %54 = load i32, ptr %4, align 4
  ret i32 %54
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { mustprogress 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; 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: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef range(i32 -1073741824, 1073741825) i32 @_Z4findPiii(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not24 = icmp slt i32 %1, 0
  br i1 %.not24, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3, %14
  %.027.in = phi i32 [ %15, %14 ], [ %1, %3 ]
  %.01726 = phi i32 [ %.1, %14 ], [ %1, %3 ]
  %.01825 = phi i32 [ %.119, %14 ], [ 0, %3 ]
  %.027 = sdiv i32 %.027.in, 2
  %4 = sext i32 %.027 to i64
  %5 = getelementptr inbounds i32, ptr %0, i64 %4
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %7 = icmp slt i32 %6, %2
  br i1 %7, label %8, label %10

8:                                                ; preds = %.lr.ph
  %9 = add nsw i32 %.027, 1
  br label %14

10:                                               ; preds = %.lr.ph
  %11 = icmp sgt i32 %6, %2
  br i1 %11, label %12, label %._crit_edge

12:                                               ; preds = %10
  %13 = add nsw i32 %.027, -1
  br label %14

14:                                               ; preds = %12, %8
  %.119 = phi i32 [ %9, %8 ], [ %.01825, %12 ]
  %.1 = phi i32 [ %.01726, %8 ], [ %13, %12 ]
  %15 = add nsw i32 %.1, %.119
  %.not = icmp sgt i32 %.119, %.1
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %10, %14, %3
  %.020 = phi i32 [ 0, %3 ], [ %.119, %14 ], [ %.027, %10 ]
  ret i32 %.020
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) 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" }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass