; LLVM IR from rantala/string-sorting :: external (mkqsort)

; 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
define dso_local void @vecswap2(ptr noundef %0, ptr noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %12, %3
  %9 = load i32, ptr %6, align 4, !tbaa !9
  %10 = add nsw i32 %9, -1
  store i32 %10, ptr %6, align 4, !tbaa !9
  %11 = icmp sgt i32 %9, 0
  br i1 %11, label %12, label %22

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = load ptr, ptr %13, align 8, !tbaa !5
  store ptr %14, ptr %7, align 8, !tbaa !5
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = load ptr, ptr %15, align 8, !tbaa !5
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = getelementptr inbounds ptr, ptr %17, i32 1
  store ptr %18, ptr %4, align 8, !tbaa !5
  store ptr %16, ptr %17, align 8, !tbaa !5
  %19 = load ptr, ptr %7, align 8, !tbaa !5
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = getelementptr inbounds ptr, ptr %20, i32 1
  store ptr %21, ptr %5, align 8, !tbaa !5
  store ptr %19, ptr %20, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  br label %8, !llvm.loop !11

22:                                               ; preds = %8
  ret void
}

; 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

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 = 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(readwrite, inaccessiblemem: none) uwtable
define dso_local void @vecswap2(ptr nocapture noundef %0, ptr nocapture noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp sgt i32 %2, 0
  br i1 %4, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %3
  %5 = zext nneg i32 %2 to i64
  %min.iters.check = icmp ult i32 %2, 10
  br i1 %min.iters.check, label %.lr.ph.preheader22, label %vector.memcheck

vector.memcheck:                                  ; preds = %.lr.ph.preheader
  %6 = add nsw i32 %2, -1
  %7 = zext i32 %6 to i64
  %8 = shl nuw nsw i64 %7, 3
  %9 = add nuw nsw i64 %8, 8
  %scevgep = getelementptr i8, ptr %0, i64 %9
  %scevgep10 = getelementptr i8, ptr %1, i64 %9
  %bound0 = icmp ugt ptr %scevgep10, %0
  %bound1 = icmp ugt ptr %scevgep, %1
  %found.conflict = and i1 %bound0, %bound1
  br i1 %found.conflict, label %.lr.ph.preheader22, label %vector.ph

vector.ph:                                        ; preds = %vector.memcheck
  %n.vec = and i64 %5, 2147483644
  %10 = shl nuw nsw i64 %n.vec, 3
  %ind.end = getelementptr i8, ptr %0, i64 %10
  %.cast = trunc nuw nsw i64 %n.vec to i32
  %ind.end11 = sub nsw i32 %2, %.cast
  %11 = shl nuw nsw i64 %n.vec, 3
  %ind.end13 = getelementptr i8, ptr %1, i64 %11
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %offset.idx = shl i64 %index, 3
  %next.gep = getelementptr i8, ptr %0, i64 %offset.idx
  %offset.idx16 = shl i64 %index, 3
  %next.gep17 = getelementptr i8, ptr %1, i64 %offset.idx16
  %12 = getelementptr i8, ptr %next.gep, i64 16
  %wide.load = load <2 x ptr>, ptr %next.gep, align 8, !tbaa !5, !alias.scope !9, !noalias !12
  %wide.load19 = load <2 x ptr>, ptr %12, align 8, !tbaa !5, !alias.scope !9, !noalias !12
  %13 = getelementptr i8, ptr %next.gep17, i64 16
  %wide.load20 = load <2 x ptr>, ptr %next.gep17, align 8, !tbaa !5, !alias.scope !12
  %wide.load21 = load <2 x ptr>, ptr %13, align 8, !tbaa !5, !alias.scope !12
  store <2 x ptr> %wide.load20, ptr %next.gep, align 8, !tbaa !5, !alias.scope !9, !noalias !12
  store <2 x ptr> %wide.load21, ptr %12, align 8, !tbaa !5, !alias.scope !9, !noalias !12
  store <2 x ptr> %wide.load, ptr %next.gep17, align 8, !tbaa !5, !alias.scope !12
  store <2 x ptr> %wide.load19, ptr %13, align 8, !tbaa !5, !alias.scope !12
  %index.next = add nuw i64 %index, 4
  %14 = icmp eq i64 %index.next, %n.vec
  br i1 %14, label %middle.block, label %vector.body, !llvm.loop !14

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %5
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader22

.lr.ph.preheader22:                               ; preds = %middle.block, %vector.memcheck, %.lr.ph.preheader
  %.09.ph = phi ptr [ %0, %vector.memcheck ], [ %0, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.058.ph = phi i32 [ %2, %vector.memcheck ], [ %2, %.lr.ph.preheader ], [ %ind.end11, %middle.block ]
  %.067.ph = phi ptr [ %1, %vector.memcheck ], [ %1, %.lr.ph.preheader ], [ %ind.end13, %middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader22, %.lr.ph
  %.09 = phi ptr [ %18, %.lr.ph ], [ %.09.ph, %.lr.ph.preheader22 ]
  %.058 = phi i32 [ %15, %.lr.ph ], [ %.058.ph, %.lr.ph.preheader22 ]
  %.067 = phi ptr [ %19, %.lr.ph ], [ %.067.ph, %.lr.ph.preheader22 ]
  %15 = add nsw i32 %.058, -1
  %16 = load ptr, ptr %.09, align 8, !tbaa !5
  %17 = load ptr, ptr %.067, align 8, !tbaa !5
  %18 = getelementptr inbounds i8, ptr %.09, i64 8
  store ptr %17, ptr %.09, align 8, !tbaa !5
  %19 = getelementptr inbounds i8, ptr %.067, i64 8
  store ptr %16, ptr %.067, align 8, !tbaa !5
  %20 = icmp ugt i32 %.058, 1
  br i1 %20, label %.lr.ph, label %._crit_edge, !llvm.loop !18

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %3
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, 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" }

!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 = distinct !{!10, !11}
!11 = distinct !{!11, !"LVerDomain"}
!12 = !{!13}
!13 = distinct !{!13, !11}
!14 = distinct !{!14, !15, !16, !17}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!"llvm.loop.isvectorized", i32 1}
!17 = !{!"llvm.loop.unroll.runtime.disable"}
!18 = distinct !{!18, !15, !16}


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