; LLVM IR from tum-i4/obfuscation-benchmarks :: basic-algorithms (anagram)

; 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"

@__const.rand_string.charset = external hidden unnamed_addr constant [37 x i8], align 16

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local ptr @rand_string(ptr noundef %0, i64 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca [37 x i8], align 16
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 37, ptr %5) #4
  call void @llvm.memcpy.p0.p0.i64(ptr align 16 %5, ptr align 16 @__const.rand_string.charset, i64 37, i1 false)
  %8 = load i64, ptr %4, align 8, !tbaa !9
  %9 = icmp ne i64 %8, 0
  br i1 %9, label %10, label %35

10:                                               ; preds = %2
  %11 = load i64, ptr %4, align 8, !tbaa !9
  %12 = add i64 %11, -1
  store i64 %12, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  store i64 0, ptr %6, align 8, !tbaa !9
  br label %13

13:                                               ; preds = %28, %10
  %14 = load i64, ptr %6, align 8, !tbaa !9
  %15 = load i64, ptr %4, align 8, !tbaa !9
  %16 = icmp ult i64 %14, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #4
  br label %31

18:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  %19 = call i32 @rand() #4
  %20 = srem i32 %19, 36
  store i32 %20, ptr %7, align 4, !tbaa !11
  %21 = load i32, ptr %7, align 4, !tbaa !11
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [37 x i8], ptr %5, i64 0, i64 %22
  %24 = load i8, ptr %23, align 1, !tbaa !13
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = load i64, ptr %6, align 8, !tbaa !9
  %27 = getelementptr inbounds i8, ptr %25, i64 %26
  store i8 %24, ptr %27, align 1, !tbaa !13
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %28

28:                                               ; preds = %18
  %29 = load i64, ptr %6, align 8, !tbaa !9
  %30 = add i64 %29, 1
  store i64 %30, ptr %6, align 8, !tbaa !9
  br label %13, !llvm.loop !14

31:                                               ; preds = %17
  %32 = load ptr, ptr %3, align 8, !tbaa !5
  %33 = load i64, ptr %4, align 8, !tbaa !9
  %34 = getelementptr inbounds i8, ptr %32, i64 %33
  store i8 0, ptr %34, align 1, !tbaa !13
  br label %35

35:                                               ; preds = %31, %2
  %36 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 37, ptr %5) #4
  ret ptr %36
}

; 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

; Function Attrs: nounwind
declare i32 @rand() #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { nounwind "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 #4 = { 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 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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"

@__const.rand_string.charset = external hidden unnamed_addr constant [37 x i8], align 16

; Function Attrs: nounwind uwtable
define dso_local noundef ptr @rand_string(ptr noundef returned writeonly %0, i64 noundef %1) local_unnamed_addr #0 {
  %.not = icmp eq i64 %1, 0
  br i1 %.not, label %13, label %3

3:                                                ; preds = %2
  %4 = add i64 %1, -1
  %.not13 = icmp eq i64 %4, 0
  br i1 %.not13, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %3
  %5 = getelementptr inbounds i8, ptr %0, i64 %4
  store i8 0, ptr %5, align 1, !tbaa !5
  br label %13

.lr.ph:                                           ; preds = %3, %.lr.ph
  %.012 = phi i64 [ %12, %.lr.ph ], [ 0, %3 ]
  %6 = tail call i32 @rand() #2
  %7 = srem i32 %6, 36
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [37 x i8], ptr @__const.rand_string.charset, i64 0, i64 %8
  %10 = load i8, ptr %9, align 1, !tbaa !5
  %11 = getelementptr inbounds i8, ptr %0, i64 %.012
  store i8 %10, ptr %11, align 1, !tbaa !5
  %12 = add nuw i64 %.012, 1
  %exitcond.not = icmp eq i64 %12, %4
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !8

13:                                               ; preds = %._crit_edge, %2
  ret ptr %0
}

; Function Attrs: nounwind
declare i32 @rand() 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 = { nounwind "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 = { 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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