; LLVM IR from kenjin/Awesome-LC-C-Cracker :: leetcode-c-sol/2000_reverse-prefix-of-word (2000_reverse-prefix-of-word)

; 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 ptr @reversePrefix(ptr noundef %0, i8 noundef signext %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i8, align 1
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i8 %1, ptr %4, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !10
  br label %6

6:                                                ; preds = %26, %2
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = load i32, ptr %5, align 4, !tbaa !10
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds i8, ptr %7, i64 %9
  %11 = load i8, ptr %10, align 1, !tbaa !9
  %12 = sext i8 %11 to i32
  %13 = icmp ne i32 %12, 0
  br i1 %13, label %14, label %24

14:                                               ; preds = %6
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = load i32, ptr %5, align 4, !tbaa !10
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds i8, ptr %15, i64 %17
  %19 = load i8, ptr %18, align 1, !tbaa !9
  %20 = sext i8 %19 to i32
  %21 = load i8, ptr %4, align 1, !tbaa !9
  %22 = sext i8 %21 to i32
  %23 = icmp ne i32 %20, %22
  br label %24

24:                                               ; preds = %14, %6
  %25 = phi i1 [ false, %6 ], [ %23, %14 ]
  br i1 %25, label %26, label %29

26:                                               ; preds = %24
  %27 = load i32, ptr %5, align 4, !tbaa !10
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %5, align 4, !tbaa !10
  br label %6, !llvm.loop !12

29:                                               ; preds = %24
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  %31 = load i32, ptr %5, align 4, !tbaa !10
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds i8, ptr %30, i64 %32
  %34 = load i8, ptr %33, align 1, !tbaa !9
  %35 = icmp ne i8 %34, 0
  br i1 %35, label %36, label %39

36:                                               ; preds = %29
  %37 = load ptr, ptr %3, align 8, !tbaa !5
  %38 = load i32, ptr %5, align 4, !tbaa !10
  call void @reverse_str(ptr noundef %37, i32 noundef 0, i32 noundef %38)
  br label %39

39:                                               ; preds = %36, %29
  %40 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret ptr %40
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint nounwind uwtable
declare hidden void @reverse_str(ptr noundef, i32 noundef, i32 noundef) #2

; 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 = { inlinehint 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 #3 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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: nounwind uwtable
define dso_local noundef ptr @reversePrefix(ptr noundef returned %0, i8 noundef signext %1) local_unnamed_addr #0 {
  br label %3

3:                                                ; preds = %3, %2
  %indvars.iv = phi i64 [ %indvars.iv.next, %3 ], [ 0, %2 ]
  %4 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %5 = load i8, ptr %4, align 1, !tbaa !5
  %.not = icmp eq i8 %5, 0
  %.not11 = icmp eq i8 %5, %1
  %or.cond = or i1 %.not, %.not11
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  br i1 %or.cond, label %.critedge, label %3, !llvm.loop !8

.critedge:                                        ; preds = %3
  br i1 %.not, label %8, label %6

6:                                                ; preds = %.critedge
  %7 = trunc nuw nsw i64 %indvars.iv to i32
  tail call void @reverse_str(ptr noundef nonnull %0, i32 noundef 0, i32 noundef %7)
  br label %8

8:                                                ; preds = %6, %.critedge
  ret ptr %0
}

; Function Attrs: inlinehint nounwind uwtable
declare hidden void @reverse_str(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #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 = { inlinehint 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" }

!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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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