; LLVM IR from rantala/string-sorting :: src (routines)

; 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"

%struct.routine = type { ptr, ptr, ptr, i8 }

@routine_cnt = external hidden global i32, align 4
@routines = external hidden global [256 x ptr], align 16

; Function Attrs: nounwind uwtable
define dso_local ptr @routine_from_name(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %26, %1
  %7 = load i32, ptr %4, align 4, !tbaa !9
  %8 = load i32, ptr @routine_cnt, align 4, !tbaa !9
  %9 = icmp ult i32 %7, %8
  br i1 %9, label %10, label %29

10:                                               ; preds = %6
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = load i32, ptr %4, align 4, !tbaa !9
  %13 = zext i32 %12 to i64
  %14 = getelementptr inbounds [256 x ptr], ptr @routines, i64 0, i64 %13
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.routine, ptr %15, i32 0, i32 1
  %17 = load ptr, ptr %16, align 8, !tbaa !11
  %18 = call i32 @strcmp(ptr noundef %11, ptr noundef %17) #4
  %19 = icmp eq i32 %18, 0
  br i1 %19, label %20, label %25

20:                                               ; preds = %10
  %21 = load i32, ptr %4, align 4, !tbaa !9
  %22 = zext i32 %21 to i64
  %23 = getelementptr inbounds [256 x ptr], ptr @routines, i64 0, i64 %22
  %24 = load ptr, ptr %23, align 8, !tbaa !5
  store ptr %24, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %30

25:                                               ; preds = %10
  br label %26

26:                                               ; preds = %25
  %27 = load i32, ptr %4, align 4, !tbaa !9
  %28 = add i32 %27, 1
  store i32 %28, ptr %4, align 4, !tbaa !9
  br label %6, !llvm.loop !13

29:                                               ; preds = %6
  store ptr null, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %30

30:                                               ; preds = %29, %20
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  %31 = load ptr, ptr %2, align 8
  ret ptr %31
}

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

; Function Attrs: nounwind willreturn memory(read)
declare i32 @strcmp(ptr noundef, ptr 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 = { 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 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 8}
!12 = !{!"routine", !6, i64 0, !6, i64 8, !6, i64 16, !10, i64 24}
!13 = distinct !{!13, !14}
!14 = !{!"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"

@routine_cnt = external hidden local_unnamed_addr global i32, align 4
@routines = external hidden local_unnamed_addr global [256 x ptr], align 16

; Function Attrs: nofree nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local ptr @routine_from_name(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @routine_cnt, align 4, !tbaa !5
  %.not = icmp eq i32 %2, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %wide.trip.count = zext i32 %2 to i64
  br label %.lr.ph

3:                                                ; preds = %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

.lr.ph:                                           ; preds = %.lr.ph.preheader, %3
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %3 ]
  %4 = getelementptr inbounds [256 x ptr], ptr @routines, i64 0, i64 %indvars.iv
  %5 = load ptr, ptr %4, align 8, !tbaa !11
  %6 = getelementptr inbounds i8, ptr %5, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !13
  %8 = tail call i32 @strcmp(ptr noundef nonnull dereferenceable(1) %0, ptr noundef nonnull dereferenceable(1) %7) #2
  %9 = icmp eq i32 %8, 0
  br i1 %9, label %._crit_edge, label %3

._crit_edge:                                      ; preds = %.lr.ph, %3, %1
  %.05 = phi ptr [ null, %1 ], [ null, %3 ], [ %5, %.lr.ph ]
  ret ptr %.05
}

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

attributes #0 = { nofree nounwind memory(read, inaccessiblemem: none) 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 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !12, i64 0}
!12 = !{!"any pointer", !7, i64 0}
!13 = !{!14, !12, i64 8}
!14 = !{!"routine", !12, i64 0, !12, i64 8, !12, i64 16, !6, i64 24}


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