; LLVM IR from lolosssss/leetcode :: c (7_reverse_integer)

; 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: nounwind uwtable
define dso_local i32 @reverse(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !5
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = icmp eq i32 0, %7
  br i1 %8, label %9, label %11

9:                                                ; preds = %1
  %10 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %10, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %49

11:                                               ; preds = %1
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = icmp eq i64 -2147483648, %13
  br i1 %14, label %15, label %16

15:                                               ; preds = %11
  store i32 0, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %49

16:                                               ; preds = %11
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = icmp slt i32 %17, 0
  br i1 %18, label %19, label %22

19:                                               ; preds = %16
  store i32 1, ptr %4, align 4, !tbaa !5
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = sub nsw i32 0, %20
  store i32 %21, ptr %3, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %19, %16
  br label %23

23:                                               ; preds = %38, %22
  %24 = load i32, ptr %5, align 4, !tbaa !5
  %25 = mul nsw i32 %24, 10
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = srem i32 %26, 10
  %28 = add nsw i32 %25, %27
  store i32 %28, ptr %5, align 4, !tbaa !5
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = sdiv i32 %29, 10
  store i32 %30, ptr %3, align 4, !tbaa !5
  %31 = load i32, ptr %5, align 4, !tbaa !5
  %32 = icmp sgt i32 %31, 214748364
  br i1 %32, label %33, label %37

33:                                               ; preds = %23
  %34 = load i32, ptr %3, align 4, !tbaa !5
  %35 = icmp ne i32 %34, 0
  br i1 %35, label %36, label %37

36:                                               ; preds = %33
  store i32 0, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %49

37:                                               ; preds = %33, %23
  br label %38

38:                                               ; preds = %37
  %39 = load i32, ptr %3, align 4, !tbaa !5
  %40 = icmp ne i32 %39, 0
  br i1 %40, label %23, label %41, !llvm.loop !9

41:                                               ; preds = %38
  %42 = load i32, ptr %4, align 4, !tbaa !5
  %43 = icmp eq i32 %42, 1
  br i1 %43, label %44, label %47

44:                                               ; preds = %41
  %45 = load i32, ptr %5, align 4, !tbaa !5
  %46 = sub nsw i32 0, %45
  store i32 %46, ptr %5, align 4, !tbaa !5
  br label %47

47:                                               ; preds = %44, %41
  %48 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %48, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %49

49:                                               ; preds = %47, %36, %15, %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %50 = load i32, ptr %2, align 4
  ret i32 %50
}

; 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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(none) uwtable
define dso_local i32 @reverse(i32 noundef %0) local_unnamed_addr #0 {
  switch i32 %0, label %2 [
    i32 0, label %.loopexit
    i32 -2147483648, label %.loopexit
  ]

2:                                                ; preds = %1
  %3 = icmp slt i32 %0, 0
  %spec.select = tail call i32 @llvm.abs.i32(i32 %0, i1 true)
  br label %4

4:                                                ; preds = %11, %2
  %.118 = phi i32 [ %spec.select, %2 ], [ %7, %11 ]
  %.0 = phi i32 [ 0, %2 ], [ %8, %11 ]
  %5 = mul nsw i32 %.0, 10
  %6 = urem i32 %.118, 10
  %7 = udiv i32 %.118, 10
  %8 = add nsw i32 %5, %6
  %9 = icmp sgt i32 %8, 214748364
  %10 = icmp ugt i32 %.118, 9
  %or.cond = and i1 %10, %9
  br i1 %or.cond, label %.loopexit, label %11

11:                                               ; preds = %4
  br i1 %10, label %4, label %12, !llvm.loop !5

12:                                               ; preds = %11
  %13 = sub nsw i32 0, %8
  %spec.select23 = select i1 %3, i32 %13, i32 %8
  br label %.loopexit

.loopexit:                                        ; preds = %4, %1, %1, %12
  %.019 = phi i32 [ %spec.select23, %12 ], [ 0, %1 ], [ 0, %1 ], [ 0, %4 ]
  ret i32 %.019
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.abs.i32(i32, i1 immarg) #1

attributes #0 = { nofree norecurse nosync nounwind memory(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" }
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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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