; LLVM IR from m-boutaleb/LZS :: src (utils)

; 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: 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 zeroext i16 @compare_string(ptr noundef %0, ptr noundef %1, i16 noundef zeroext %2) #1 {
  %4 = alloca i16, align 2
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i16, align 2
  %8 = alloca i16, align 2
  %9 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i16 %2, ptr %7, align 2, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 2, ptr %8) #2
  store i16 0, ptr %8, align 2, !tbaa !9
  br label %10

10:                                               ; preds = %30, %3
  %11 = load i16, ptr %7, align 2, !tbaa !9
  %12 = add i16 %11, -1
  store i16 %12, ptr %7, align 2, !tbaa !9
  %13 = icmp ne i16 %11, 0
  br i1 %13, label %14, label %31

14:                                               ; preds = %10
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = load i16, ptr %8, align 2, !tbaa !9
  %17 = zext i16 %16 to i64
  %18 = getelementptr inbounds i8, ptr %15, i64 %17
  %19 = load i8, ptr %18, align 1, !tbaa !11
  %20 = zext i8 %19 to i32
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = load i16, ptr %8, align 2, !tbaa !9
  %23 = add i16 %22, 1
  store i16 %23, ptr %8, align 2, !tbaa !9
  %24 = zext i16 %22 to i64
  %25 = getelementptr inbounds i8, ptr %21, i64 %24
  %26 = load i8, ptr %25, align 1, !tbaa !11
  %27 = zext i8 %26 to i32
  %28 = icmp ne i32 %20, %27
  br i1 %28, label %29, label %30

29:                                               ; preds = %14
  store i16 1, ptr %4, align 2
  store i32 1, ptr %9, align 4
  br label %32

30:                                               ; preds = %14
  br label %10, !llvm.loop !12

31:                                               ; preds = %10
  store i16 0, ptr %4, align 2
  store i32 1, ptr %9, align 4
  br label %32

32:                                               ; preds = %31, %29
  call void @llvm.lifetime.end.p0(i64 2, ptr %8) #2
  %33 = load i16, ptr %4, align 2
  ret i16 %33
}

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 = { 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 = !{!"short", !7, i64 0}
!11 = !{!7, !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: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local zeroext range(i16 0, 2) i16 @compare_string(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i16 noundef zeroext %2) local_unnamed_addr #0 {
  br label %4

4:                                                ; preds = %5, %3
  %.05 = phi i16 [ %2, %3 ], [ %6, %5 ]
  %.0 = phi i16 [ 0, %3 ], [ %10, %5 ]
  %.not = icmp eq i16 %.05, 0
  br i1 %.not, label %13, label %5

5:                                                ; preds = %4
  %6 = add i16 %.05, -1
  %7 = zext i16 %.0 to i64
  %8 = getelementptr inbounds i8, ptr %0, i64 %7
  %9 = load i8, ptr %8, align 1, !tbaa !5
  %10 = add i16 %.0, 1
  %11 = getelementptr inbounds i8, ptr %1, i64 %7
  %12 = load i8, ptr %11, align 1, !tbaa !5
  %.not7 = icmp eq i8 %9, %12
  br i1 %.not7, label %4, label %13, !llvm.loop !8

13:                                               ; preds = %4, %5
  %.06 = phi i16 [ 1, %5 ], [ 0, %4 ]
  ret i16 %.06
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: read) 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: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass