; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (69)

; 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 i64, align 8
  store i32 %0, ptr %3, align 4, !tbaa !5
  %5 = load i32, ptr %3, align 4, !tbaa !5
  %6 = icmp eq i32 %5, 1
  br i1 %6, label %7, label %8

7:                                                ; preds = %1
  store i32 1, ptr %2, align 4
  br label %30

8:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %9 = load i32, ptr %3, align 4, !tbaa !5
  %10 = ashr i32 %9, 1
  %11 = sext i32 %10 to i64
  store i64 %11, ptr %4, align 8, !tbaa !9
  br label %12

12:                                               ; preds = %19, %8
  %13 = load i64, ptr %4, align 8, !tbaa !9
  %14 = load i64, ptr %4, align 8, !tbaa !9
  %15 = mul nsw i64 %13, %14
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = icmp sgt i64 %15, %17
  br i1 %18, label %19, label %27

19:                                               ; preds = %12
  %20 = load i64, ptr %4, align 8, !tbaa !9
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = load i64, ptr %4, align 8, !tbaa !9
  %24 = sdiv i64 %22, %23
  %25 = add nsw i64 %20, %24
  %26 = ashr i64 %25, 1
  store i64 %26, ptr %4, align 8, !tbaa !9
  br label %12, !llvm.loop !11

27:                                               ; preds = %12
  %28 = load i64, ptr %4, align 8, !tbaa !9
  %29 = trunc i64 %28 to i32
  store i32 %29, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %30

30:                                               ; preds = %27, %7
  %31 = load i32, ptr %2, align 4
  ret i32 %31
}

; 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 = !{!10, !10, i64 0}
!10 = !{!"long", !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: nofree norecurse nosync nounwind memory(none) uwtable
define dso_local i32 @mySqrt(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq i32 %0, 1
  br i1 %2, label %._crit_edge, label %3

3:                                                ; preds = %1
  %4 = ashr i32 %0, 1
  %5 = sext i32 %4 to i64
  %6 = sext i32 %0 to i64
  %7 = mul nsw i64 %5, %5
  %8 = icmp sgt i64 %7, %6
  br i1 %8, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3, %.lr.ph
  %.013 = phi i64 [ %11, %.lr.ph ], [ %5, %3 ]
  %9 = sdiv i64 %6, %.013
  %10 = add nsw i64 %9, %.013
  %11 = ashr i64 %10, 1
  %12 = mul nsw i64 %11, %11
  %13 = icmp sgt i64 %12, %6
  br i1 %13, label %.lr.ph, label %._crit_edge.loopexit, !llvm.loop !5

._crit_edge.loopexit:                             ; preds = %.lr.ph
  %14 = trunc i64 %11 to i32
  br label %._crit_edge

._crit_edge:                                      ; preds = %3, %._crit_edge.loopexit, %1
  %.010 = phi i32 [ 1, %1 ], [ %4, %3 ], [ %14, %._crit_edge.loopexit ]
  ret i32 %.010
}

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


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