; LLVM IR from davidesantangelo/krep :: krep (find_line_start)

; 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 i64 @find_line_start(ptr noundef %0, i64 noundef %1, i64 noundef %2) #1 {
  %4 = alloca i64, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i64, align 8
  %10 = alloca ptr, align 8
  %11 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i64 %1, ptr %6, align 8, !tbaa !9
  store i64 %2, ptr %7, align 8, !tbaa !9
  %12 = load i64, ptr %7, align 8, !tbaa !9
  %13 = load i64, ptr %6, align 8, !tbaa !9
  %14 = icmp ugt i64 %12, %13
  br i1 %14, label %15, label %17

15:                                               ; preds = %3
  %16 = load i64, ptr %6, align 8, !tbaa !9
  store i64 %16, ptr %7, align 8, !tbaa !9
  br label %17

17:                                               ; preds = %15, %3
  %18 = load i64, ptr %7, align 8, !tbaa !9
  %19 = icmp eq i64 %18, 0
  br i1 %19, label %20, label %21

20:                                               ; preds = %17
  store i64 0, ptr %4, align 8
  br label %38

21:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %22, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  %23 = load i64, ptr %7, align 8, !tbaa !9
  store i64 %23, ptr %9, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #3
  %24 = load ptr, ptr %8, align 8, !tbaa !5
  %25 = load i64, ptr %9, align 8, !tbaa !9
  %26 = call ptr @memrchr(ptr noundef %24, i32 noundef 10, i64 noundef %25) #4
  store ptr %26, ptr %10, align 8, !tbaa !5
  %27 = load ptr, ptr %10, align 8, !tbaa !5
  %28 = icmp ne ptr %27, null
  br i1 %28, label %29, label %36

29:                                               ; preds = %21
  %30 = load ptr, ptr %10, align 8, !tbaa !5
  %31 = load ptr, ptr %8, align 8, !tbaa !5
  %32 = ptrtoint ptr %30 to i64
  %33 = ptrtoint ptr %31 to i64
  %34 = sub i64 %32, %33
  %35 = add nsw i64 %34, 1
  store i64 %35, ptr %4, align 8
  store i32 1, ptr %11, align 4
  br label %37

36:                                               ; preds = %21
  store i64 0, ptr %4, align 8
  store i32 1, ptr %11, align 4
  br label %37

37:                                               ; preds = %36, %29
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  br label %38

38:                                               ; preds = %37, %20
  %39 = load i64, ptr %4, align 8
  ret i64 %39
}

; Function Attrs: nounwind willreturn memory(read)
declare ptr @memrchr(ptr noundef, i32 noundef, i64 noundef) #2

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 willreturn memory(read) "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 willreturn memory(read) }

!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}


; 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: mustprogress nofree nounwind willreturn memory(argmem: read) uwtable
define dso_local range(i64 -9223372036854775807, -9223372036854775808) i64 @find_line_start(ptr noundef %0, i64 noundef %1, i64 noundef %2) local_unnamed_addr #0 {
  %spec.select = tail call i64 @llvm.umin.i64(i64 %2, i64 %1)
  %4 = icmp eq i64 %spec.select, 0
  br i1 %4, label %10, label %5

5:                                                ; preds = %3
  %6 = tail call ptr @memrchr(ptr noundef %0, i32 noundef 10, i64 noundef %spec.select) #3
  %.not = icmp eq ptr %6, null
  %7 = ptrtoint ptr %6 to i64
  %8 = ptrtoint ptr %0 to i64
  %reass.sub = sub i64 %7, %8
  %9 = add i64 %reass.sub, 1
  %.0 = select i1 %.not, i64 0, i64 %9
  br label %10

10:                                               ; preds = %3, %5
  %.1 = phi i64 [ %.0, %5 ], [ 0, %3 ]
  ret i64 %.1
}

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare ptr @memrchr(ptr noundef, i32 noundef, i64 noundef) local_unnamed_addr #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.umin.i64(i64, i64) #2

attributes #0 = { mustprogress nofree nounwind willreturn 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" }
attributes #1 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 nosync nounwind speculatable willreturn memory(none) }
attributes #3 = { nounwind willreturn memory(read) }

!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: GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass