; LLVM IR from sp-nitech/SPTK :: third_party/WORLD/matlabfunctions.ll (ZN4sptk5world4diffEPKdiPd)

; 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: mustprogress nounwind uwtable
define dso_local void @_ZN4sptk5world4diffEPKdiPd(ptr noundef %0, i32 noundef %1, ptr noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %31, %3
  %9 = load i32, ptr %7, align 4, !tbaa !9
  %10 = load i32, ptr %5, align 4, !tbaa !9
  %11 = sub nsw i32 %10, 1
  %12 = icmp slt i32 %9, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %34

14:                                               ; preds = %8
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = add nsw i32 %16, 1
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds double, ptr %15, i64 %18
  %20 = load double, ptr %19, align 8, !tbaa !11
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = load i32, ptr %7, align 4, !tbaa !9
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds double, ptr %21, i64 %23
  %25 = load double, ptr %24, align 8, !tbaa !11
  %26 = fsub double %20, %25
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  %28 = load i32, ptr %7, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds double, ptr %27, i64 %29
  store double %26, ptr %30, align 8, !tbaa !11
  br label %31

31:                                               ; preds = %14
  %32 = load i32, ptr %7, align 4, !tbaa !9
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %7, align 4, !tbaa !9
  br label %8, !llvm.loop !13

34:                                               ; preds = %13
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !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: mustprogress nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local void @_ZN4sptk5world4diffEPKdiPd(ptr nocapture noundef readonly %0, i32 noundef %1, ptr nocapture noundef writeonly %2) local_unnamed_addr #0 {
  %4 = icmp sgt i32 %1, 1
  br i1 %4, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %3
  %5 = add nsw i32 %1, -1
  %wide.trip.count = zext i32 %5 to i64
  %min.iters.check = icmp ult i32 %1, 9
  br i1 %min.iters.check, label %.lr.ph.preheader14, label %vector.memcheck

.lr.ph.preheader14:                               ; 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, 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.preheader14, %.lr.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %.lr.ph.prol ], [ %indvars.iv.ph, %.lr.ph.preheader14 ]
  %prol.iter = phi i64 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader14 ]
  %indvars.iv.next.prol = add nuw nsw i64 %indvars.iv.prol, 1
  %6 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.next.prol
  %7 = load double, ptr %6, align 8, !tbaa !5
  %8 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.prol
  %9 = load double, ptr %8, align 8, !tbaa !5
  %10 = fsub double %7, %9
  %11 = getelementptr inbounds double, ptr %2, i64 %indvars.iv.prol
  store double %10, ptr %11, align 8, !tbaa !5
  %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 !9

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader14
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.lr.ph.preheader14 ], [ %indvars.iv.next.prol, %.lr.ph.prol ]
  %12 = sub nsw i64 %indvars.iv.ph, %wide.trip.count
  %13 = icmp ugt i64 %12, -4
  br i1 %13, label %._crit_edge, label %.lr.ph

vector.memcheck:                                  ; preds = %.lr.ph.preheader
  %14 = shl nuw nsw i64 %wide.trip.count, 3
  %scevgep = getelementptr i8, ptr %2, i64 %14
  %15 = getelementptr i8, ptr %0, i64 %14
  %scevgep10 = getelementptr i8, ptr %15, i64 8
  %bound0 = icmp ugt ptr %scevgep10, %2
  %bound1 = icmp ugt ptr %scevgep, %0
  %found.conflict = and i1 %bound0, %bound1
  br i1 %found.conflict, label %.lr.ph.preheader14, 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 ]
  %16 = or disjoint i64 %index, 1
  %17 = getelementptr inbounds double, ptr %0, i64 %16
  %18 = getelementptr inbounds i8, ptr %17, i64 16
  %wide.load = load <2 x double>, ptr %17, align 8, !tbaa !5, !alias.scope !11
  %wide.load11 = load <2 x double>, ptr %18, align 8, !tbaa !5, !alias.scope !11
  %19 = getelementptr inbounds double, ptr %0, i64 %index
  %20 = getelementptr inbounds i8, ptr %19, i64 16
  %wide.load12 = load <2 x double>, ptr %19, align 8, !tbaa !5, !alias.scope !11
  %wide.load13 = load <2 x double>, ptr %20, align 8, !tbaa !5, !alias.scope !11
  %21 = fsub <2 x double> %wide.load, %wide.load12
  %22 = fsub <2 x double> %wide.load11, %wide.load13
  %23 = getelementptr inbounds double, ptr %2, i64 %index
  %24 = getelementptr inbounds i8, ptr %23, i64 16
  store <2 x double> %21, ptr %23, align 8, !tbaa !5, !alias.scope !14, !noalias !11
  store <2 x double> %22, ptr %24, align 8, !tbaa !5, !alias.scope !14, !noalias !11
  %index.next = add nuw i64 %index, 4
  %25 = icmp eq i64 %index.next, %n.vec
  br i1 %25, label %middle.block, label %vector.body, !llvm.loop !16

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.preheader14

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

.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 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %26 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.next
  %27 = load double, ptr %26, align 8, !tbaa !5
  %28 = getelementptr inbounds double, ptr %0, i64 %indvars.iv
  %29 = load double, ptr %28, align 8, !tbaa !5
  %30 = fsub double %27, %29
  %31 = getelementptr inbounds double, ptr %2, i64 %indvars.iv
  store double %30, ptr %31, align 8, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %32 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.next.1
  %33 = load double, ptr %32, align 8, !tbaa !5
  %34 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.next
  %35 = load double, ptr %34, align 8, !tbaa !5
  %36 = fsub double %33, %35
  %37 = getelementptr inbounds double, ptr %2, i64 %indvars.iv.next
  store double %36, ptr %37, align 8, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %38 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.next.2
  %39 = load double, ptr %38, align 8, !tbaa !5
  %40 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.next.1
  %41 = load double, ptr %40, align 8, !tbaa !5
  %42 = fsub double %39, %41
  %43 = getelementptr inbounds double, ptr %2, i64 %indvars.iv.next.1
  store double %42, ptr %43, align 8, !tbaa !5
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %44 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.next.3
  %45 = load double, ptr %44, align 8, !tbaa !5
  %46 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.next.2
  %47 = load double, ptr %46, align 8, !tbaa !5
  %48 = fsub double %45, %47
  %49 = getelementptr inbounds double, ptr %2, i64 %indvars.iv.next.2
  store double %48, ptr %49, align 8, !tbaa !5
  %exitcond.not.3 = icmp eq i64 %indvars.iv.next.3, %wide.trip.count
  br i1 %exitcond.not.3, label %._crit_edge, label %.lr.ph, !llvm.loop !20
}

attributes #0 = { mustprogress 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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.unroll.disable"}
!11 = !{!12}
!12 = distinct !{!12, !13}
!13 = distinct !{!13, !"LVerDomain"}
!14 = !{!15}
!15 = distinct !{!15, !13}
!16 = distinct !{!16, !17, !18, !19}
!17 = !{!"llvm.loop.mustprogress"}
!18 = !{!"llvm.loop.isvectorized", i32 1}
!19 = !{!"llvm.loop.unroll.runtime.disable"}
!20 = distinct !{!20, !17, !18}


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