; LLVM IR from simon-zerisenay/42_Push_Swap :: src (midpoint)

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

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

7:                                                ; preds = %10, %1
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = icmp ne ptr %8, null
  br i1 %9, label %10, label %21

10:                                               ; preds = %7
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.t_list, ptr %11, i32 0, i32 1
  %13 = load i32, ptr %12, align 4, !tbaa !11
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = add nsw i32 %14, %13
  store i32 %15, ptr %5, align 4, !tbaa !9
  %16 = load i32, ptr %4, align 4, !tbaa !9
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr %4, align 4, !tbaa !9
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.t_list, ptr %18, i32 0, i32 5
  %20 = load ptr, ptr %19, align 8, !tbaa !13
  store ptr %20, ptr %3, align 8, !tbaa !5
  br label %7, !llvm.loop !14

21:                                               ; preds = %7
  %22 = load i32, ptr %5, align 4, !tbaa !9
  %23 = load i32, ptr %4, align 4, !tbaa !9
  %24 = srem i32 %22, %23
  %25 = icmp eq i32 %24, 0
  br i1 %25, label %26, label %30

26:                                               ; preds = %21
  %27 = load i32, ptr %5, align 4, !tbaa !9
  %28 = load i32, ptr %4, align 4, !tbaa !9
  %29 = sdiv i32 %27, %28
  store i32 %29, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %35

30:                                               ; preds = %21
  %31 = load i32, ptr %5, align 4, !tbaa !9
  %32 = load i32, ptr %4, align 4, !tbaa !9
  %33 = sdiv i32 %31, %32
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %35

35:                                               ; preds = %30, %26
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %36 = load i32, ptr %2, align 4
  ret i32 %36
}

; 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 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 4}
!12 = !{!"t_list", !10, i64 0, !10, i64 4, !10, i64 8, !10, i64 12, !10, i64 16, !6, i64 24}
!13 = !{!12, !6, i64 24}
!14 = distinct !{!14, !15}
!15 = !{!"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: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local i32 @find_midpt(ptr noundef readonly %0) local_unnamed_addr #0 {
  %.not14 = icmp eq ptr %0, null
  br i1 %.not14, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.017 = phi i32 [ %4, %.lr.ph ], [ 0, %1 ]
  %.01116 = phi i32 [ %5, %.lr.ph ], [ 0, %1 ]
  %.01215 = phi ptr [ %7, %.lr.ph ], [ %0, %1 ]
  %2 = getelementptr inbounds i8, ptr %.01215, i64 4
  %3 = load i32, ptr %2, align 4, !tbaa !5
  %4 = add nsw i32 %3, %.017
  %5 = add nuw nsw i32 %.01116, 1
  %6 = getelementptr inbounds i8, ptr %.01215, i64 24
  %7 = load ptr, ptr %6, align 8, !tbaa !11
  %.not = icmp eq ptr %7, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.011.lcssa = phi i32 [ 0, %1 ], [ %5, %.lr.ph ]
  %.0.lcssa = phi i32 [ 0, %1 ], [ %4, %.lr.ph ]
  %8 = srem i32 %.0.lcssa, %.011.lcssa
  %9 = icmp ne i32 %8, 0
  %10 = sdiv i32 %.0.lcssa, %.011.lcssa
  %11 = zext i1 %9 to i32
  %.013 = add nsw i32 %10, %11
  ret i32 %.013
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) 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, !7, i64 4}
!6 = !{!"t_list", !7, i64 0, !7, i64 4, !7, i64 8, !7, i64 12, !7, i64 16, !10, i64 24}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 24}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass