; LLVM IR from kenjin/Awesome-LC-C-Cracker :: leetcode-c-sol/0397_integer-replacement (0397_integer-replacement)

; 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 @integerReplacement(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = icmp eq i32 %6, 1
  br i1 %7, label %8, label %9

8:                                                ; preds = %1
  store i32 0, ptr %2, align 4
  br label %38

9:                                                ; preds = %1
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = srem i32 %10, 2
  %12 = icmp ne i32 %11, 0
  br i1 %12, label %13, label %33

13:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = ashr i32 %14, 1
  %16 = add nsw i32 %15, 1
  %17 = call i32 @integerReplacement(i32 noundef %16)
  %18 = add nsw i32 %17, 2
  store i32 %18, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = sub nsw i32 %19, 1
  %21 = ashr i32 %20, 1
  %22 = call i32 @integerReplacement(i32 noundef %21)
  %23 = add nsw i32 %22, 2
  store i32 %23, ptr %5, align 4, !tbaa !5
  %24 = load i32, ptr %4, align 4, !tbaa !5
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = icmp slt i32 %24, %25
  br i1 %26, label %27, label %29

27:                                               ; preds = %13
  %28 = load i32, ptr %4, align 4, !tbaa !5
  br label %31

29:                                               ; preds = %13
  %30 = load i32, ptr %5, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %29, %27
  %32 = phi i32 [ %28, %27 ], [ %30, %29 ]
  store i32 %32, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %38

33:                                               ; preds = %9
  %34 = load i32, ptr %3, align 4, !tbaa !5
  %35 = ashr i32 %34, 1
  %36 = call i32 @integerReplacement(i32 noundef %35)
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %2, align 4
  br label %38

38:                                               ; preds = %33, %31, %8
  %39 = load i32, ptr %2, align 4
  ret i32 %39
}

; 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 nosync nounwind memory(none) uwtable
define dso_local i32 @integerReplacement(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq i32 %0, 1
  br i1 %2, label %common.ret30, label %.lr.ph

.lr.ph:                                           ; preds = %1, %tailrecurse
  %.tr15 = phi i32 [ %4, %tailrecurse ], [ %0, %1 ]
  %accumulator.tr14 = phi i32 [ %14, %tailrecurse ], [ 0, %1 ]
  %3 = and i32 %.tr15, 1
  %.not = icmp eq i32 %3, 0
  %4 = ashr i32 %.tr15, 1
  br i1 %.not, label %tailrecurse, label %5

common.ret30:                                     ; preds = %1, %tailrecurse, %5
  %common.ret30.op = phi i32 [ %accumulator.ret.tr, %5 ], [ 0, %1 ], [ %14, %tailrecurse ]
  ret i32 %common.ret30.op

5:                                                ; preds = %.lr.ph
  %6 = add nsw i32 %4, 1
  %7 = tail call i32 @integerReplacement(i32 noundef %6)
  %8 = add nsw i32 %7, 2
  %9 = add nsw i32 %.tr15, -1
  %10 = ashr exact i32 %9, 1
  %11 = tail call i32 @integerReplacement(i32 noundef %10)
  %12 = add nsw i32 %11, 2
  %13 = tail call i32 @llvm.smin.i32(i32 %8, i32 %12)
  %accumulator.ret.tr = add nsw i32 %13, %accumulator.tr14
  br label %common.ret30

tailrecurse:                                      ; preds = %.lr.ph
  %14 = add nuw nsw i32 %accumulator.tr14, 1
  %15 = icmp eq i32 %.tr15, 2
  br i1 %15, label %common.ret30, label %.lr.ph
}

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

attributes #0 = { nofree 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)"}


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