; LLVM IR from CLASS-SZ/class_sz :: class-sz/tools (r8lib)

; 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 void @r8vec_swap(i32 noundef %0, ptr noundef %1, ptr noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca double, align 8
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %33, %3
  %10 = load i32, ptr %7, align 4, !tbaa !5
  %11 = load i32, ptr %4, align 4, !tbaa !5
  %12 = icmp slt i32 %10, %11
  br i1 %12, label %13, label %36

13:                                               ; preds = %9
  %14 = load ptr, ptr %5, align 8, !tbaa !9
  %15 = load i32, ptr %7, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds double, ptr %14, i64 %16
  %18 = load double, ptr %17, align 8, !tbaa !11
  store double %18, ptr %8, align 8, !tbaa !11
  %19 = load ptr, ptr %6, align 8, !tbaa !9
  %20 = load i32, ptr %7, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds double, ptr %19, i64 %21
  %23 = load double, ptr %22, align 8, !tbaa !11
  %24 = load ptr, ptr %5, align 8, !tbaa !9
  %25 = load i32, ptr %7, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds double, ptr %24, i64 %26
  store double %23, ptr %27, align 8, !tbaa !11
  %28 = load double, ptr %8, align 8, !tbaa !11
  %29 = load ptr, ptr %6, align 8, !tbaa !9
  %30 = load i32, ptr %7, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds double, ptr %29, i64 %31
  store double %28, ptr %32, align 8, !tbaa !11
  br label %33

33:                                               ; preds = %13
  %34 = load i32, ptr %7, align 4, !tbaa !5
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %7, align 4, !tbaa !5
  br label %9, !llvm.loop !13

36:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret void
}

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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"double", !7, i64 0}
!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"

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local void @r8vec_swap(i32 noundef %0, ptr nocapture noundef %1, ptr nocapture noundef %2) local_unnamed_addr #0 {
  %4 = icmp sgt i32 %0, 0
  br i1 %4, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %3
  %wide.trip.count = zext nneg i32 %0 to i64
  %min.iters.check = icmp ult i32 %0, 8
  br i1 %min.iters.check, label %.lr.ph.preheader17, label %vector.memcheck

vector.memcheck:                                  ; preds = %.lr.ph.preheader
  %5 = shl nuw nsw i64 %wide.trip.count, 3
  %scevgep = getelementptr i8, ptr %1, i64 %5
  %scevgep13 = getelementptr i8, ptr %2, i64 %5
  %bound0 = icmp ugt ptr %scevgep13, %1
  %bound1 = icmp ugt ptr %scevgep, %2
  %found.conflict = and i1 %bound0, %bound1
  br i1 %found.conflict, label %.lr.ph.preheader17, label %vector.ph

vector.ph:                                        ; preds = %vector.memcheck
  %n.vec = and i64 %wide.trip.count, 2147483644
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %6 = getelementptr inbounds double, ptr %1, i64 %index
  %7 = getelementptr inbounds i8, ptr %6, i64 16
  %wide.load = load <2 x double>, ptr %6, align 8, !tbaa !5, !alias.scope !9, !noalias !12
  %wide.load14 = load <2 x double>, ptr %7, align 8, !tbaa !5, !alias.scope !9, !noalias !12
  %8 = getelementptr inbounds double, ptr %2, i64 %index
  %9 = getelementptr inbounds i8, ptr %8, i64 16
  %wide.load15 = load <2 x double>, ptr %8, align 8, !tbaa !5, !alias.scope !12
  %wide.load16 = load <2 x double>, ptr %9, align 8, !tbaa !5, !alias.scope !12
  store <2 x double> %wide.load15, ptr %6, align 8, !tbaa !5, !alias.scope !9, !noalias !12
  store <2 x double> %wide.load16, ptr %7, align 8, !tbaa !5, !alias.scope !9, !noalias !12
  store <2 x double> %wide.load, ptr %8, align 8, !tbaa !5, !alias.scope !12
  store <2 x double> %wide.load14, ptr %9, align 8, !tbaa !5, !alias.scope !12
  %index.next = add nuw i64 %index, 4
  %10 = icmp eq i64 %index.next, %n.vec
  br i1 %10, label %middle.block, label %vector.body, !llvm.loop !14

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader17

.lr.ph.preheader17:                               ; preds = %middle.block, %vector.memcheck, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %vector.memcheck ], [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %xtraiter = and i64 %wide.trip.count, 1
  %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.preheader17
  %11 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.ph
  %12 = load double, ptr %11, align 8, !tbaa !5
  %13 = getelementptr inbounds double, ptr %2, i64 %indvars.iv.ph
  %14 = load double, ptr %13, align 8, !tbaa !5
  store double %14, ptr %11, align 8, !tbaa !5
  store double %12, ptr %13, align 8, !tbaa !5
  %indvars.iv.next.prol = or disjoint i64 %indvars.iv.ph, 1
  br label %.lr.ph.prol.loopexit

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader17
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.lr.ph.preheader17 ], [ %indvars.iv.next.prol, %.lr.ph.prol ]
  %15 = add nsw i64 %wide.trip.count, -1
  %16 = icmp eq i64 %indvars.iv.ph, %15
  br i1 %16, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next.1, %.lr.ph ], [ %indvars.iv.unr, %.lr.ph.prol.loopexit ]
  %17 = getelementptr inbounds double, ptr %1, i64 %indvars.iv
  %18 = load double, ptr %17, align 8, !tbaa !5
  %19 = getelementptr inbounds double, ptr %2, i64 %indvars.iv
  %20 = load double, ptr %19, align 8, !tbaa !5
  store double %20, ptr %17, align 8, !tbaa !5
  store double %18, ptr %19, align 8, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %21 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next
  %22 = load double, ptr %21, align 8, !tbaa !5
  %23 = getelementptr inbounds double, ptr %2, i64 %indvars.iv.next
  %24 = load double, ptr %23, align 8, !tbaa !5
  store double %24, ptr %21, align 8, !tbaa !5
  store double %22, ptr %23, align 8, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %exitcond.not.1 = icmp eq i64 %indvars.iv.next.1, %wide.trip.count
  br i1 %exitcond.not.1, label %._crit_edge, label %.lr.ph, !llvm.loop !18

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

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: readwrite) 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 = !{!"double", !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: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass