; LLVM IR from google/esh :: shell/lib/string (string)

; 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 ptr @memset(ptr noundef %0, i32 noundef %1, i64 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i64 %2, ptr %6, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %9, ptr %8, align 8, !tbaa !5
  store i64 0, ptr %7, align 8, !tbaa !11
  br label %10

10:                                               ; preds = %20, %3
  %11 = load i64, ptr %7, align 8, !tbaa !11
  %12 = load i64, ptr %6, align 8, !tbaa !11
  %13 = icmp ult i64 %11, %12
  br i1 %13, label %14, label %23

14:                                               ; preds = %10
  %15 = load i32, ptr %5, align 4, !tbaa !9
  %16 = trunc i32 %15 to i8
  %17 = load ptr, ptr %8, align 8, !tbaa !5
  %18 = load i64, ptr %7, align 8, !tbaa !11
  %19 = getelementptr inbounds i8, ptr %17, i64 %18
  store i8 %16, ptr %19, align 1, !tbaa !13
  br label %20

20:                                               ; preds = %14
  %21 = load i64, ptr %7, align 8, !tbaa !11
  %22 = add i64 %21, 1
  store i64 %22, ptr %7, align 8, !tbaa !11
  br label %10, !llvm.loop !14

23:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  ret ptr null
}

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 = !{!12, !12, i64 0}
!12 = !{!"long", !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"

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: write) uwtable
define dso_local noalias noundef ptr @memset(ptr nocapture noundef writeonly %0, i32 noundef %1, i64 noundef %2) local_unnamed_addr #0 {
  %.not = icmp eq i64 %2, 0
  br i1 %.not, label %._crit_edge, label %iter.check

iter.check:                                       ; preds = %3
  %4 = trunc i32 %1 to i8
  %min.iters.check = icmp ult i64 %2, 8
  br i1 %min.iters.check, label %vec.epilog.scalar.ph.preheader, label %vector.main.loop.iter.check

vector.main.loop.iter.check:                      ; preds = %iter.check
  %min.iters.check7 = icmp ult i64 %2, 32
  br i1 %min.iters.check7, label %vec.epilog.ph, label %vector.ph

vector.ph:                                        ; preds = %vector.main.loop.iter.check
  %n.vec = and i64 %2, -32
  %broadcast.splatinsert = insertelement <16 x i8> poison, i8 %4, i64 0
  %broadcast.splat = shufflevector <16 x i8> %broadcast.splatinsert, <16 x i8> poison, <16 x i32> zeroinitializer
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %5 = getelementptr inbounds i8, ptr %0, i64 %index
  %6 = getelementptr inbounds i8, ptr %5, i64 16
  store <16 x i8> %broadcast.splat, ptr %5, align 1, !tbaa !5
  store <16 x i8> %broadcast.splat, ptr %6, align 1, !tbaa !5
  %index.next = add nuw i64 %index, 32
  %7 = icmp eq i64 %index.next, %n.vec
  br i1 %7, label %middle.block, label %vector.body, !llvm.loop !8

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %2
  br i1 %cmp.n, label %._crit_edge, label %vec.epilog.iter.check

vec.epilog.iter.check:                            ; preds = %middle.block
  %n.vec.remaining = and i64 %2, 24
  %min.epilog.iters.check = icmp eq i64 %n.vec.remaining, 0
  br i1 %min.epilog.iters.check, label %vec.epilog.scalar.ph.preheader, label %vec.epilog.ph

vec.epilog.ph:                                    ; preds = %vector.main.loop.iter.check, %vec.epilog.iter.check
  %vec.epilog.resume.val = phi i64 [ %n.vec, %vec.epilog.iter.check ], [ 0, %vector.main.loop.iter.check ]
  %n.vec9 = and i64 %2, -8
  %broadcast.splatinsert11 = insertelement <8 x i8> poison, i8 %4, i64 0
  %broadcast.splat12 = shufflevector <8 x i8> %broadcast.splatinsert11, <8 x i8> poison, <8 x i32> zeroinitializer
  br label %vec.epilog.vector.body

vec.epilog.vector.body:                           ; preds = %vec.epilog.vector.body, %vec.epilog.ph
  %index10 = phi i64 [ %vec.epilog.resume.val, %vec.epilog.ph ], [ %index.next13, %vec.epilog.vector.body ]
  %8 = getelementptr inbounds i8, ptr %0, i64 %index10
  store <8 x i8> %broadcast.splat12, ptr %8, align 1, !tbaa !5
  %index.next13 = add nuw i64 %index10, 8
  %9 = icmp eq i64 %index.next13, %n.vec9
  br i1 %9, label %vec.epilog.middle.block, label %vec.epilog.vector.body, !llvm.loop !12

vec.epilog.middle.block:                          ; preds = %vec.epilog.vector.body
  %cmp.n14 = icmp eq i64 %n.vec9, %2
  br i1 %cmp.n14, label %._crit_edge, label %vec.epilog.scalar.ph.preheader

vec.epilog.scalar.ph.preheader:                   ; preds = %vec.epilog.middle.block, %iter.check, %vec.epilog.iter.check
  %.06.ph = phi i64 [ 0, %iter.check ], [ %n.vec, %vec.epilog.iter.check ], [ %n.vec9, %vec.epilog.middle.block ]
  br label %vec.epilog.scalar.ph

vec.epilog.scalar.ph:                             ; preds = %vec.epilog.scalar.ph.preheader, %vec.epilog.scalar.ph
  %.06 = phi i64 [ %11, %vec.epilog.scalar.ph ], [ %.06.ph, %vec.epilog.scalar.ph.preheader ]
  %10 = getelementptr inbounds i8, ptr %0, i64 %.06
  store i8 %4, ptr %10, align 1, !tbaa !5
  %11 = add nuw i64 %.06, 1
  %exitcond.not = icmp eq i64 %11, %2
  br i1 %exitcond.not, label %._crit_edge, label %vec.epilog.scalar.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %vec.epilog.scalar.ph, %middle.block, %vec.epilog.middle.block, %3
  ret ptr null
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: write) 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, !10, !11}
!9 = !{!"llvm.loop.mustprogress"}
!10 = !{!"llvm.loop.isvectorized", i32 1}
!11 = !{!"llvm.loop.unroll.runtime.disable"}
!12 = distinct !{!12, !9, !10, !11}
!13 = distinct !{!13, !9, !11, !10}


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