; LLVM IR from tangjz/acm-icpc :: 51nod/1382.ll (ZN7Segment3maxEv)

; 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.Segment = type { i32, i32, i32, [4 x i64], [2 x 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: mustprogress nounwind uwtable
define dso_local noundef i64 @_ZN7Segment3maxEv(ptr noundef nonnull align 8 dereferenceable(64) %0) #1 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  %5 = load ptr, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store i64 -1061109567, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !11
  br label %6

6:                                                ; preds = %25, %1
  %7 = load i32, ptr %4, align 4, !tbaa !11
  %8 = icmp slt i32 %7, 4
  br i1 %8, label %10, label %9

9:                                                ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %28

10:                                               ; preds = %6
  %11 = load i64, ptr %3, align 8, !tbaa !9
  %12 = getelementptr inbounds %struct.Segment, ptr %5, i32 0, i32 3
  %13 = load i32, ptr %4, align 4, !tbaa !11
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [4 x i64], ptr %12, i64 0, i64 %14
  %16 = load i64, ptr %15, align 8, !tbaa !9
  %17 = icmp slt i64 %11, %16
  br i1 %17, label %18, label %24

18:                                               ; preds = %10
  %19 = getelementptr inbounds %struct.Segment, ptr %5, i32 0, i32 3
  %20 = load i32, ptr %4, align 4, !tbaa !11
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [4 x i64], ptr %19, i64 0, i64 %21
  %23 = load i64, ptr %22, align 8, !tbaa !9
  store i64 %23, ptr %3, align 8, !tbaa !9
  br label %24

24:                                               ; preds = %18, %10
  br label %25

25:                                               ; preds = %24
  %26 = load i32, ptr %4, align 4, !tbaa !11
  %27 = add nsw i32 %26, 1
  store i32 %27, ptr %4, align 4, !tbaa !11
  br label %6, !llvm.loop !13

28:                                               ; preds = %9
  %29 = load i64, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i64 %29
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!"long long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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(i64 -1061109567, -9223372036854775808) i64 @_ZN7Segment3maxEv(ptr nocapture noundef nonnull readonly align 8 dereferenceable(64) %0) local_unnamed_addr #0 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 16
  %3 = load i64, ptr %2, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %0, i64 24
  %5 = load i64, ptr %4, align 8, !tbaa !5
  %spec.select = tail call i64 @llvm.smax.i64(i64 %3, i64 %5)
  %6 = getelementptr inbounds i8, ptr %0, i64 32
  %7 = load i64, ptr %6, align 8, !tbaa !5
  %spec.select.1 = tail call i64 @llvm.smax.i64(i64 %spec.select, i64 %7)
  %8 = getelementptr inbounds i8, ptr %0, i64 40
  %9 = load i64, ptr %8, align 8, !tbaa !5
  %spec.select.2 = tail call i64 @llvm.smax.i64(i64 %spec.select.1, i64 %9)
  %spec.select.3 = tail call i64 @llvm.smax.i64(i64 %spec.select.2, i64 -1061109567)
  ret i64 %spec.select.3
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.smax.i64(i64, i64) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LICMPass,LoopRotatePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass