; LLVM IR from xuxping/codelife :: leetcode (14_longest-common-prefix)

; 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"

@.str = external hidden unnamed_addr constant [1 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local ptr @longestCommonPrefix(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  %12 = alloca ptr, align 8
  %13 = alloca ptr, align 8
  %14 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %15 = load i32, ptr %5, align 4, !tbaa !9
  %16 = icmp sle i32 %15, 0
  br i1 %16, label %17, label %18

17:                                               ; preds = %2
  store ptr @.str, ptr %3, align 8
  br label %74

18:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds ptr, ptr %19, i64 0
  %21 = load ptr, ptr %20, align 8, !tbaa !5
  store ptr %21, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = getelementptr inbounds ptr, ptr %22, i64 0
  %24 = load ptr, ptr %23, align 8, !tbaa !5
  store ptr %24, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  store i32 0, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %25

25:                                               ; preds = %30, %18
  %26 = load ptr, ptr %7, align 8, !tbaa !5
  %27 = load i8, ptr %26, align 1, !tbaa !11
  %28 = sext i8 %27 to i32
  %29 = icmp ne i32 %28, 0
  br i1 %29, label %30, label %35

30:                                               ; preds = %25
  %31 = load ptr, ptr %7, align 8, !tbaa !5
  %32 = getelementptr inbounds i8, ptr %31, i32 1
  store ptr %32, ptr %7, align 8, !tbaa !5
  %33 = load i32, ptr %9, align 4, !tbaa !9
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %9, align 4, !tbaa !9
  br label %25, !llvm.loop !12

35:                                               ; preds = %25
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  store i32 1, ptr %10, align 4, !tbaa !9
  br label %36

36:                                               ; preds = %47, %35
  %37 = load i32, ptr %10, align 4, !tbaa !9
  %38 = load i32, ptr %5, align 4, !tbaa !9
  %39 = icmp slt i32 %37, %38
  br i1 %39, label %41, label %40

40:                                               ; preds = %36
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  br label %50

41:                                               ; preds = %36
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  store i32 0, ptr %11, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %12) #3
  %42 = load ptr, ptr %4, align 8, !tbaa !5
  %43 = load i32, ptr %10, align 4, !tbaa !9
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds ptr, ptr %42, i64 %44
  %46 = load ptr, ptr %45, align 8, !tbaa !5
  store ptr %46, ptr %12, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %12) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #3
  br label %47

47:                                               ; preds = %41
  %48 = load i32, ptr %10, align 4, !tbaa !9
  %49 = add nsw i32 %48, 1
  store i32 %49, ptr %10, align 4, !tbaa !9
  br label %36, !llvm.loop !14

50:                                               ; preds = %40
  call void @llvm.lifetime.start.p0(i64 8, ptr %13) #3
  %51 = load i32, ptr %9, align 4, !tbaa !9
  %52 = load i32, ptr %8, align 4, !tbaa !9
  %53 = sub nsw i32 %51, %52
  %54 = add nsw i32 %53, 1
  %55 = sext i32 %54 to i64
  %56 = mul i64 1, %55
  %57 = call noalias ptr @malloc(i64 noundef %56) #4
  store ptr %57, ptr %13, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %14) #3
  store i32 0, ptr %14, align 4, !tbaa !9
  br label %58

58:                                               ; preds = %62, %50
  %59 = load ptr, ptr %6, align 8, !tbaa !5
  %60 = load ptr, ptr %7, align 8, !tbaa !5
  %61 = icmp ne ptr %59, %60
  br i1 %61, label %62, label %72

62:                                               ; preds = %58
  %63 = load ptr, ptr %6, align 8, !tbaa !5
  %64 = load i8, ptr %63, align 1, !tbaa !11
  %65 = load ptr, ptr %13, align 8, !tbaa !5
  %66 = load i32, ptr %14, align 4, !tbaa !9
  %67 = add nsw i32 %66, 1
  store i32 %67, ptr %14, align 4, !tbaa !9
  %68 = sext i32 %66 to i64
  %69 = getelementptr inbounds i8, ptr %65, i64 %68
  store i8 %64, ptr %69, align 1, !tbaa !11
  %70 = load ptr, ptr %6, align 8, !tbaa !5
  %71 = getelementptr inbounds i8, ptr %70, i32 1
  store ptr %71, ptr %6, align 8, !tbaa !5
  br label %58, !llvm.loop !15

72:                                               ; preds = %58
  %73 = load ptr, ptr %13, align 8, !tbaa !5
  store ptr %73, ptr %3, align 8
  call void @llvm.lifetime.end.p0(i64 4, ptr %14) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %13) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br label %74

74:                                               ; preds = %72, %17
  %75 = load ptr, ptr %3, align 8
  ret ptr %75
}

; 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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

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 allocsize(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 #3 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}
!15 = distinct !{!15, !13}


; 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"

@.str = external hidden unnamed_addr constant [1 x i8], align 1

; Function Attrs: nofree nounwind uwtable
define dso_local ptr @longestCommonPrefix(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %1, 1
  br i1 %3, label %.loopexit, label %4

4:                                                ; preds = %2
  %5 = load ptr, ptr %0, align 8, !tbaa !5
  %6 = ptrtoint ptr %5 to i64
  %7 = load i8, ptr %5, align 1, !tbaa !9
  %.not27 = icmp eq i8 %7, 0
  br i1 %.not27, label %.preheader.thread, label %.lr.ph

.preheader.thread:                                ; preds = %4
  %8 = tail call noalias dereferenceable_or_null(1) ptr @malloc(i64 noundef 1) #3
  br label %.loopexit

.preheader:                                       ; preds = %.lr.ph
  %9 = add nuw nsw i32 %.02428, 2
  %10 = zext nneg i32 %9 to i64
  %11 = tail call noalias ptr @malloc(i64 noundef %10) #3
  %.pre = ptrtoint ptr %13 to i64
  %12 = sub i64 %.pre, %6
  tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 1 dereferenceable(1) %11, ptr noundef nonnull align 1 dereferenceable(1) %5, i64 %12, i1 false), !tbaa !9
  br label %.loopexit

.lr.ph:                                           ; preds = %4, %.lr.ph
  %.02229 = phi ptr [ %13, %.lr.ph ], [ %5, %4 ]
  %.02428 = phi i32 [ %14, %.lr.ph ], [ 0, %4 ]
  %13 = getelementptr inbounds i8, ptr %.02229, i64 1
  %14 = add nuw nsw i32 %.02428, 1
  %15 = load i8, ptr %13, align 1, !tbaa !9
  %.not = icmp eq i8 %15, 0
  br i1 %.not, label %.preheader, label %.lr.ph, !llvm.loop !10

.loopexit:                                        ; preds = %.preheader.thread, %.preheader, %2
  %.020 = phi ptr [ @.str, %2 ], [ %11, %.preheader ], [ %8, %.preheader.thread ]
  ret ptr %.020
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

attributes #0 = { nofree 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 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 #2 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { nounwind allocsize(0) }

!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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


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