; LLVM IR from kenjin/Awesome-LC-C-Cracker :: leetcode-c-sol/0069_Sqrt-X (0069_Sqrt-X)

; 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 @mySqrt(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
  %7 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = icmp eq i32 %8, 0
  br i1 %9, label %10, label %11

10:                                               ; preds = %1
  store i32 0, ptr %2, align 4
  br label %46

11:                                               ; preds = %1
  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
  %12 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %12, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %44, %11
  br label %14

14:                                               ; preds = %13
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = add nsw i32 %15, %16
  %18 = sdiv i32 %17, 2
  store i32 %18, ptr %6, align 4, !tbaa !5
  %19 = load i32, ptr %6, align 4, !tbaa !5
  %20 = icmp eq i32 %19, 0
  br i1 %20, label %21, label %22

21:                                               ; preds = %14
  store i32 1, ptr %2, align 4
  store i32 1, ptr %7, align 4
  br label %45

22:                                               ; preds = %14
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = load i32, ptr %6, align 4, !tbaa !5
  %25 = sdiv i32 %23, %24
  %26 = load i32, ptr %6, align 4, !tbaa !5
  %27 = icmp slt i32 %25, %26
  br i1 %27, label %28, label %31

28:                                               ; preds = %22
  %29 = load i32, ptr %6, align 4, !tbaa !5
  %30 = sub nsw i32 %29, 1
  store i32 %30, ptr %5, align 4, !tbaa !5
  br label %44

31:                                               ; preds = %22
  %32 = load i32, ptr %6, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  %34 = load i32, ptr %3, align 4, !tbaa !5
  %35 = load i32, ptr %6, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  %37 = sdiv i32 %34, %36
  %38 = icmp sgt i32 %33, %37
  br i1 %38, label %39, label %41

39:                                               ; preds = %31
  %40 = load i32, ptr %6, align 4, !tbaa !5
  store i32 %40, ptr %2, align 4
  store i32 1, ptr %7, align 4
  br label %45

41:                                               ; preds = %31
  %42 = load i32, ptr %6, align 4, !tbaa !5
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %4, align 4, !tbaa !5
  br label %44

44:                                               ; preds = %41, %28
  br label %13

45:                                               ; preds = %39, %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %46

46:                                               ; preds = %45, %10
  %47 = load i32, ptr %2, align 4
  ret i32 %47
}

; 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"}


; 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 range(i32 -1073741824, 1073741824) i32 @mySqrt(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq i32 %0, 0
  br i1 %2, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %1
  %.off22 = add i32 %0, 1
  %3 = icmp ult i32 %.off22, 3
  br i1 %3, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %12
  %.in = phi i32 [ %13, %12 ], [ %0, %.preheader ]
  %.024 = phi i32 [ %.1, %12 ], [ %0, %.preheader ]
  %.01523 = phi i32 [ %.116, %12 ], [ 0, %.preheader ]
  %4 = sdiv i32 %.in, 2
  %5 = sdiv i32 %0, %4
  %6 = icmp slt i32 %5, %4
  br i1 %6, label %7, label %9

7:                                                ; preds = %.lr.ph
  %8 = add nsw i32 %4, -1
  br label %12

9:                                                ; preds = %.lr.ph
  %10 = add nsw i32 %4, 1
  %11 = sdiv i32 %0, %10
  %.not = icmp slt i32 %4, %11
  br i1 %.not, label %12, label %.loopexit

12:                                               ; preds = %9, %7
  %.116 = phi i32 [ %.01523, %7 ], [ %10, %9 ]
  %.1 = phi i32 [ %8, %7 ], [ %.024, %9 ]
  %13 = add nsw i32 %.1, %.116
  %.off = add i32 %13, 1
  %14 = icmp ult i32 %.off, 3
  br i1 %14, label %.loopexit, label %.lr.ph

.loopexit:                                        ; preds = %9, %12, %.preheader, %1
  %.118 = phi i32 [ 0, %1 ], [ 1, %.preheader ], [ %4, %9 ], [ 1, %12 ]
  ret i32 %.118
}

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" }

!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)"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass