; LLVM IR from 0intro/wmii :: lib/libutf (rune)

; 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 i32 @runenlen(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %7

7:                                                ; preds = %40, %2
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = add nsw i32 %8, -1
  store i32 %9, ptr %4, align 4, !tbaa !9
  %10 = icmp ne i32 %8, 0
  br i1 %10, label %11, label %41

11:                                               ; preds = %7
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds i32, ptr %12, i32 1
  store ptr %13, ptr %3, align 8, !tbaa !5
  %14 = load i32, ptr %12, align 4, !tbaa !9
  store i32 %14, ptr %6, align 4, !tbaa !9
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = icmp sle i32 %15, 127
  br i1 %16, label %17, label %20

17:                                               ; preds = %11
  %18 = load i32, ptr %5, align 4, !tbaa !9
  %19 = add nsw i32 %18, 1
  store i32 %19, ptr %5, align 4, !tbaa !9
  br label %40

20:                                               ; preds = %11
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = icmp sle i32 %21, 2047
  br i1 %22, label %23, label %26

23:                                               ; preds = %20
  %24 = load i32, ptr %5, align 4, !tbaa !9
  %25 = add nsw i32 %24, 2
  store i32 %25, ptr %5, align 4, !tbaa !9
  br label %39

26:                                               ; preds = %20
  %27 = load i32, ptr %6, align 4, !tbaa !9
  %28 = icmp sle i32 %27, 65535
  br i1 %28, label %32, label %29

29:                                               ; preds = %26
  %30 = load i32, ptr %6, align 4, !tbaa !9
  %31 = icmp sgt i32 %30, 1114111
  br i1 %31, label %32, label %35

32:                                               ; preds = %29, %26
  %33 = load i32, ptr %5, align 4, !tbaa !9
  %34 = add nsw i32 %33, 3
  store i32 %34, ptr %5, align 4, !tbaa !9
  br label %38

35:                                               ; preds = %29
  %36 = load i32, ptr %5, align 4, !tbaa !9
  %37 = add nsw i32 %36, 4
  store i32 %37, ptr %5, align 4, !tbaa !9
  br label %38

38:                                               ; preds = %35, %32
  br label %39

39:                                               ; preds = %38, %23
  br label %40

40:                                               ; preds = %39, %17
  br label %7, !llvm.loop !11

41:                                               ; preds = %7
  %42 = load i32, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %42
}

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 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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(read, inaccessiblemem: none) uwtable
define dso_local i32 @runenlen(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %.not14 = icmp eq i32 %1, 0
  br i1 %.not14, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %3 = zext i32 %1 to i64
  %min.iters.check = icmp ult i32 %1, 8
  br i1 %min.iters.check, label %.lr.ph.preheader29, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %3, 4294967288
  %.cast = trunc nuw i64 %n.vec to i32
  %ind.end = sub i32 %1, %.cast
  %4 = shl nuw nsw i64 %n.vec, 2
  %ind.end17 = getelementptr i8, ptr %0, i64 %4
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %16, %vector.body ]
  %vec.phi19 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %17, %vector.body ]
  %offset.idx = shl i64 %index, 2
  %next.gep = getelementptr i8, ptr %0, i64 %offset.idx
  %5 = getelementptr i8, ptr %next.gep, i64 16
  %wide.load = load <4 x i32>, ptr %next.gep, align 4, !tbaa !5
  %wide.load21 = load <4 x i32>, ptr %5, align 4, !tbaa !5
  %.not26 = icmp slt <4 x i32> %wide.load, <i32 2048, i32 2048, i32 2048, i32 2048>
  %.not28 = icmp slt <4 x i32> %wide.load21, <i32 2048, i32 2048, i32 2048, i32 2048>
  %6 = add nsw <4 x i32> %wide.load, <i32 -1114112, i32 -1114112, i32 -1114112, i32 -1114112>
  %7 = add nsw <4 x i32> %wide.load21, <i32 -1114112, i32 -1114112, i32 -1114112, i32 -1114112>
  %8 = icmp ult <4 x i32> %6, <i32 -1048576, i32 -1048576, i32 -1048576, i32 -1048576>
  %9 = icmp ult <4 x i32> %7, <i32 -1048576, i32 -1048576, i32 -1048576, i32 -1048576>
  %10 = select <4 x i1> %8, <4 x i32> <i32 3, i32 3, i32 3, i32 3>, <4 x i32> <i32 4, i32 4, i32 4, i32 4>
  %11 = select <4 x i1> %9, <4 x i32> <i32 3, i32 3, i32 3, i32 3>, <4 x i32> <i32 4, i32 4, i32 4, i32 4>
  %12 = add <4 x i32> %wide.load, <i32 -128, i32 -128, i32 -128, i32 -128>
  %13 = icmp ult <4 x i32> %12, <i32 1920, i32 1920, i32 1920, i32 1920>
  %14 = add <4 x i32> %wide.load21, <i32 -128, i32 -128, i32 -128, i32 -128>
  %15 = icmp ult <4 x i32> %14, <i32 1920, i32 1920, i32 1920, i32 1920>
  %predphi = select <4 x i1> %13, <4 x i32> <i32 2, i32 2, i32 2, i32 2>, <4 x i32> <i32 1, i32 1, i32 1, i32 1>
  %predphi22 = select <4 x i1> %15, <4 x i32> <i32 2, i32 2, i32 2, i32 2>, <4 x i32> <i32 1, i32 1, i32 1, i32 1>
  %predphi23 = select <4 x i1> %.not26, <4 x i32> %predphi, <4 x i32> %10
  %predphi24 = select <4 x i1> %.not28, <4 x i32> %predphi22, <4 x i32> %11
  %16 = add <4 x i32> %vec.phi, %predphi23
  %17 = add <4 x i32> %vec.phi19, %predphi24
  %index.next = add nuw i64 %index, 8
  %18 = icmp eq i64 %index.next, %n.vec
  br i1 %18, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <4 x i32> %17, %16
  %19 = tail call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> %bin.rdx)
  %cmp.n = icmp eq i64 %n.vec, %3
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader29

.lr.ph.preheader29:                               ; preds = %middle.block, %.lr.ph.preheader
  %.in.ph = phi i32 [ %1, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.016.ph = phi ptr [ %0, %.lr.ph.preheader ], [ %ind.end17, %middle.block ]
  %.01115.ph = phi i32 [ 0, %.lr.ph.preheader ], [ %19, %middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader29, %28
  %.in = phi i32 [ %20, %28 ], [ %.in.ph, %.lr.ph.preheader29 ]
  %.016 = phi ptr [ %21, %28 ], [ %.016.ph, %.lr.ph.preheader29 ]
  %.01115 = phi i32 [ %29, %28 ], [ %.01115.ph, %.lr.ph.preheader29 ]
  %20 = add nsw i32 %.in, -1
  %21 = getelementptr inbounds i8, ptr %.016, i64 4
  %22 = load i32, ptr %.016, align 4, !tbaa !5
  %23 = icmp slt i32 %22, 128
  br i1 %23, label %28, label %24

24:                                               ; preds = %.lr.ph
  %25 = icmp ult i32 %22, 2048
  br i1 %25, label %28, label %26

26:                                               ; preds = %24
  %27 = add nsw i32 %22, -1114112
  %or.cond = icmp ult i32 %27, -1048576
  %. = select i1 %or.cond, i32 3, i32 4
  br label %28

28:                                               ; preds = %26, %24, %.lr.ph
  %.sink = phi i32 [ 1, %.lr.ph ], [ 2, %24 ], [ %., %26 ]
  %29 = add nuw nsw i32 %.01115, %.sink
  %.not = icmp eq i32 %20, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %28, %middle.block, %2
  %.011.lcssa = phi i32 [ 0, %2 ], [ %19, %middle.block ], [ %29, %28 ]
  ret i32 %.011.lcssa
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.add.v4i32(<4 x i32>) #1

attributes #0 = { nofree norecurse nosync 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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass