; LLVM IR from rociodellasala/TP3_SO :: Kernel (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: nounwind uwtable
declare dso_local i32 @strlen(ptr noundef) #0

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

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

; Function Attrs: nounwind uwtable
define dso_local ptr @strcpy(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = call i32 @strlen(ptr noundef %7)
  store i32 %8, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %9

9:                                                ; preds = %23, %2
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = icmp sle i32 %10, %11
  br i1 %12, label %13, label %26

13:                                               ; preds = %9
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds i8, ptr %14, i64 %16
  %18 = load i8, ptr %17, align 1, !tbaa !11
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = load i32, ptr %6, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds i8, ptr %19, i64 %21
  store i8 %18, ptr %22, align 1, !tbaa !11
  br label %23

23:                                               ; preds = %13
  %24 = load i32, ptr %6, align 4, !tbaa !9
  %25 = add nsw i32 %24, 1
  store i32 %25, ptr %6, align 4, !tbaa !9
  br label %9, !llvm.loop !12

26:                                               ; preds = %9
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %28 = load i32, ptr %6, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds i8, ptr %27, i64 %29
  store i8 0, ptr %30, align 1, !tbaa !11
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret ptr %31
}

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 }

!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 = !{!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: nounwind uwtable
declare dso_local i32 @strlen(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef ptr @strcpy(ptr noundef returned writeonly %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = tail call i32 @strlen(ptr noundef %1)
  %.not10 = icmp slt i32 %3, 0
  br i1 %.not10, label %._crit_edge, label %iter.check

iter.check:                                       ; preds = %2
  %4 = ptrtoint ptr %0 to i64
  %5 = ptrtoint ptr %1 to i64
  %6 = add nuw i32 %3, 1
  %wide.trip.count = zext i32 %6 to i64
  %min.iters.check = icmp ult i32 %3, 7
  %7 = sub i64 %4, %5
  %diff.check = icmp ult i64 %7, 32
  %or.cond = or i1 %min.iters.check, %diff.check
  br i1 %or.cond, label %.lr.ph.preheader, label %vector.main.loop.iter.check

vector.main.loop.iter.check:                      ; preds = %iter.check
  %min.iters.check13 = icmp ult i32 %3, 31
  br i1 %min.iters.check13, label %vec.epilog.ph, label %vector.ph

vector.ph:                                        ; preds = %vector.main.loop.iter.check
  %n.vec = and i64 %wide.trip.count, 4294967264
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %8 = getelementptr inbounds i8, ptr %1, i64 %index
  %9 = getelementptr inbounds i8, ptr %8, i64 16
  %wide.load = load <16 x i8>, ptr %8, align 1, !tbaa !5
  %wide.load14 = load <16 x i8>, ptr %9, align 1, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %0, i64 %index
  %11 = getelementptr inbounds i8, ptr %10, i64 16
  store <16 x i8> %wide.load, ptr %10, align 1, !tbaa !5
  store <16 x i8> %wide.load14, ptr %11, align 1, !tbaa !5
  %index.next = add nuw i64 %index, 32
  %12 = icmp eq i64 %index.next, %n.vec
  br i1 %12, label %middle.block, label %vector.body, !llvm.loop !8

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

vec.epilog.iter.check:                            ; preds = %middle.block
  %n.vec.remaining = and i64 %wide.trip.count, 24
  %min.epilog.iters.check = icmp eq i64 %n.vec.remaining, 0
  br i1 %min.epilog.iters.check, label %.lr.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.vec16 = and i64 %wide.trip.count, 4294967288
  br label %vec.epilog.vector.body

vec.epilog.vector.body:                           ; preds = %vec.epilog.vector.body, %vec.epilog.ph
  %index17 = phi i64 [ %vec.epilog.resume.val, %vec.epilog.ph ], [ %index.next19, %vec.epilog.vector.body ]
  %13 = getelementptr inbounds i8, ptr %1, i64 %index17
  %wide.load18 = load <8 x i8>, ptr %13, align 1, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %0, i64 %index17
  store <8 x i8> %wide.load18, ptr %14, align 1, !tbaa !5
  %index.next19 = add nuw i64 %index17, 8
  %15 = icmp eq i64 %index.next19, %n.vec16
  br i1 %15, label %vec.epilog.middle.block, label %vec.epilog.vector.body, !llvm.loop !12

vec.epilog.middle.block:                          ; preds = %vec.epilog.vector.body
  %cmp.n20 = icmp eq i64 %n.vec16, %wide.trip.count
  br i1 %cmp.n20, label %._crit_edge.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %vec.epilog.middle.block, %iter.check, %vec.epilog.iter.check
  %indvars.iv.ph = phi i64 [ 0, %iter.check ], [ %n.vec, %vec.epilog.iter.check ], [ %n.vec16, %vec.epilog.middle.block ]
  %16 = zext nneg i32 %3 to i64
  %17 = sub nsw i64 %16, %indvars.iv.ph
  %xtraiter = and i64 %wide.trip.count, 3
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader, %.lr.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %.lr.ph.prol ], [ %indvars.iv.ph, %.lr.ph.preheader ]
  %prol.iter = phi i64 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader ]
  %18 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv.prol
  %19 = load i8, ptr %18, align 1, !tbaa !5
  %20 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.prol
  store i8 %19, ptr %20, align 1, !tbaa !5
  %indvars.iv.next.prol = add nuw nsw i64 %indvars.iv.prol, 1
  %prol.iter.next = add i64 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i64 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !13

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.lr.ph.preheader ], [ %indvars.iv.next.prol, %.lr.ph.prol ]
  %21 = icmp ult i64 %17, 3
  br i1 %21, label %._crit_edge.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next.3, %.lr.ph ], [ %indvars.iv.unr, %.lr.ph.prol.loopexit ]
  %22 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv
  %23 = load i8, ptr %22, align 1, !tbaa !5
  %24 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  store i8 %23, ptr %24, align 1, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %25 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv.next
  %26 = load i8, ptr %25, align 1, !tbaa !5
  %27 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next
  store i8 %26, ptr %27, align 1, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %28 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv.next.1
  %29 = load i8, ptr %28, align 1, !tbaa !5
  %30 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next.1
  store i8 %29, ptr %30, align 1, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %31 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv.next.2
  %32 = load i8, ptr %31, align 1, !tbaa !5
  %33 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next.2
  store i8 %32, ptr %33, align 1, !tbaa !5
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %exitcond.not.3 = icmp eq i64 %indvars.iv.next.3, %wide.trip.count
  br i1 %exitcond.not.3, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !15

._crit_edge.loopexit:                             ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %vec.epilog.middle.block, %middle.block
  %34 = zext nneg i32 %6 to i64
  br label %._crit_edge

._crit_edge:                                      ; preds = %2, %._crit_edge.loopexit
  %.0.lcssa = phi i64 [ %34, %._crit_edge.loopexit ], [ 0, %2 ]
  %35 = getelementptr inbounds i8, ptr %0, i64 %.0.lcssa
  store i8 0, ptr %35, align 1, !tbaa !5
  ret ptr %0
}

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" }

!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, !14}
!14 = !{!"llvm.loop.unroll.disable"}
!15 = distinct !{!15, !9, !10}


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