; LLVM IR from kaynewbie/algorithm :: algorithm/LeetCode/libs (stack)

; 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.s = type { ptr, i32, i32, i32 }

; 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: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @getMax(ptr noundef %0, ptr noundef %1, ptr noundef %2) #2 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca ptr, align 8
  %11 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store ptr %2, ptr %7, align 8, !tbaa !5
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.s, ptr %12, i32 0, i32 1
  %14 = load i32, ptr %13, align 8, !tbaa !9
  %15 = icmp eq i32 %14, -1
  br i1 %15, label %16, label %17

16:                                               ; preds = %3
  store i32 1, ptr %4, align 4
  br label %55

17:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.s, ptr %18, i32 0, i32 0
  %20 = load ptr, ptr %19, align 8, !tbaa !12
  store ptr %20, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 1, ptr %9, align 4, !tbaa !13
  br label %21

21:                                               ; preds = %47, %17
  %22 = load i32, ptr %9, align 4, !tbaa !13
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %9, align 4, !tbaa !13
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.s, ptr %24, i32 0, i32 1
  %26 = load i32, ptr %25, align 8, !tbaa !9
  %27 = icmp sle i32 %22, %26
  br i1 %27, label %28, label %48

28:                                               ; preds = %21
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #3
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.s, ptr %29, i32 0, i32 0
  %31 = load ptr, ptr %30, align 8, !tbaa !12
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.s, ptr %32, i32 0, i32 3
  %34 = load i32, ptr %33, align 8, !tbaa !14
  %35 = load i32, ptr %9, align 4, !tbaa !13
  %36 = mul nsw i32 %34, %35
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds i8, ptr %31, i64 %37
  store ptr %38, ptr %10, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  %39 = load ptr, ptr %7, align 8, !tbaa !5
  %40 = load ptr, ptr %8, align 8, !tbaa !5
  %41 = load ptr, ptr %10, align 8, !tbaa !5
  %42 = call i32 %39(ptr noundef %40, ptr noundef %41)
  store i32 %42, ptr %11, align 4, !tbaa !13
  %43 = load i32, ptr %11, align 4, !tbaa !13
  %44 = icmp eq i32 %43, 1
  br i1 %44, label %45, label %47

45:                                               ; preds = %28
  %46 = load ptr, ptr %10, align 8, !tbaa !5
  store ptr %46, ptr %8, align 8, !tbaa !5
  br label %47

47:                                               ; preds = %45, %28
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #3
  br label %21, !llvm.loop !15

48:                                               ; preds = %21
  %49 = load ptr, ptr %6, align 8, !tbaa !5
  %50 = load ptr, ptr %8, align 8, !tbaa !5
  %51 = load ptr, ptr %5, align 8, !tbaa !5
  %52 = getelementptr inbounds %struct.s, ptr %51, i32 0, i32 3
  %53 = load i32, ptr %52, align 8, !tbaa !14
  %54 = sext i32 %53 to i64
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %49, ptr align 1 %50, i64 %54, i1 false)
  store i32 0, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  br label %55

55:                                               ; preds = %48, %16
  %56 = load i32, ptr %4, align 4
  ret i32 %56
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #3 = { 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, !11, i64 8}
!10 = !{!"s", !6, i64 0, !11, i64 8, !11, i64 12, !11, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 0}
!13 = !{!11, !11, i64 0}
!14 = !{!10, !11, i64 16}
!15 = distinct !{!15, !16}
!16 = !{!"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 nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #0

; Function Attrs: nounwind uwtable
define dso_local range(i32 0, 2) i32 @getMax(ptr nocapture noundef readonly %0, ptr nocapture noundef writeonly %1, ptr nocapture noundef readonly %2) local_unnamed_addr #1 {
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load i32, ptr %4, align 8, !tbaa !5
  %6 = icmp eq i32 %5, -1
  br i1 %6, label %23, label %7

7:                                                ; preds = %3
  %8 = load ptr, ptr %0, align 8, !tbaa !11
  %.not17 = icmp slt i32 %5, 1
  br i1 %.not17, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %7
  %9 = getelementptr inbounds i8, ptr %0, i64 16
  br label %10

10:                                               ; preds = %.lr.ph, %10
  %.01519 = phi ptr [ %8, %.lr.ph ], [ %spec.select, %10 ]
  %.01618 = phi i32 [ 1, %.lr.ph ], [ %11, %10 ]
  %11 = add nuw nsw i32 %.01618, 1
  %12 = load ptr, ptr %0, align 8, !tbaa !11
  %13 = load i32, ptr %9, align 8, !tbaa !12
  %14 = mul nsw i32 %13, %11
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds i8, ptr %12, i64 %15
  %17 = tail call i32 %2(ptr noundef %.01519, ptr noundef %16) #2
  %18 = icmp eq i32 %17, 1
  %spec.select = select i1 %18, ptr %16, ptr %.01519
  %19 = load i32, ptr %4, align 8, !tbaa !5
  %.not.not = icmp slt i32 %.01618, %19
  br i1 %.not.not, label %10, label %._crit_edge, !llvm.loop !13

._crit_edge:                                      ; preds = %10, %7
  %.015.lcssa = phi ptr [ %8, %7 ], [ %spec.select, %10 ]
  %20 = getelementptr inbounds i8, ptr %0, i64 16
  %21 = load i32, ptr %20, align 8, !tbaa !12
  %22 = sext i32 %21 to i64
  tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 %1, ptr align 1 %.015.lcssa, i64 %22, i1 false)
  br label %23

23:                                               ; preds = %3, %._crit_edge
  %.0 = phi i32 [ 0, %._crit_edge ], [ 1, %3 ]
  ret i32 %.0
}

attributes #0 = { mustprogress nocallback nofree 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, !10, i64 8}
!6 = !{!"s", !7, i64 0, !10, i64 8, !10, i64 12, !10, i64 16}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = !{!6, !10, i64 16}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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