; LLVM IR from VAR-solutions/Algorithms :: Sorting/Pancake Sorting/CPP/pancake_sort.ll (Z11pancakeSortPii)

; 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
declare dso_local void @_Z4flipPii(ptr noundef, i32 noundef) #0

; 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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7findMaxPii(ptr noundef, i32 noundef) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z11pancakeSortPii(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %7 = load i32, ptr %4, align 4, !tbaa !9
  store i32 %7, ptr %5, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %27, %2
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = icmp sgt i32 %9, 1
  br i1 %10, label %12, label %11

11:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %30

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = call noundef i32 @_Z7findMaxPii(ptr noundef %13, i32 noundef %14)
  store i32 %15, ptr %6, align 4, !tbaa !9
  %16 = load i32, ptr %6, align 4, !tbaa !9
  %17 = load i32, ptr %5, align 4, !tbaa !9
  %18 = sub nsw i32 %17, 1
  %19 = icmp ne i32 %16, %18
  br i1 %19, label %20, label %26

20:                                               ; preds = %12
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = load i32, ptr %6, align 4, !tbaa !9
  call void @_Z4flipPii(ptr noundef %21, i32 noundef %22)
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = load i32, ptr %5, align 4, !tbaa !9
  %25 = sub nsw i32 %24, 1
  call void @_Z4flipPii(ptr noundef %23, i32 noundef %25)
  br label %26

26:                                               ; preds = %20, %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %27

27:                                               ; preds = %26
  %28 = load i32, ptr %5, align 4, !tbaa !9
  %29 = add nsw i32 %28, -1
  store i32 %29, ptr %5, align 4, !tbaa !9
  br label %8, !llvm.loop !11

30:                                               ; preds = %11
  unreachable
}

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 nounwind uwtable
declare dso_local void @_Z4flipPii(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7findMaxPii(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress noreturn nounwind uwtable
define dso_local noundef i32 @_Z11pancakeSortPii(ptr noundef %0, i32 noundef %1) local_unnamed_addr #1 {
  br label %3

3:                                                ; preds = %.backedge, %2
  %.0 = phi i32 [ %1, %2 ], [ %6, %.backedge ]
  %4 = icmp sgt i32 %.0, 1
  tail call void @llvm.assume(i1 %4)
  %5 = tail call noundef i32 @_Z7findMaxPii(ptr noundef %0, i32 noundef %.0)
  %6 = add nsw i32 %.0, -1
  %.not = icmp eq i32 %5, %6
  br i1 %.not, label %.backedge, label %7

7:                                                ; preds = %3
  tail call void @_Z4flipPii(ptr noundef %0, i32 noundef %5)
  tail call void @_Z4flipPii(ptr noundef %0, i32 noundef %6)
  br label %.backedge

.backedge:                                        ; preds = %7, %3
  br label %3, !llvm.loop !5
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write)
declare void @llvm.assume(i1 noundef) #2

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 = { mustprogress noreturn 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 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write) }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass