; LLVM IR from NOAA-PMEL/Ferret :: external_functions/v5d (binio)

; 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 @flip2(ptr noundef %0, ptr noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i16, align 2
  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
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %9

9:                                                ; preds = %35, %3
  %10 = load i32, ptr %7, align 4, !tbaa !9
  %11 = load i32, ptr %6, align 4, !tbaa !9
  %12 = icmp slt i32 %10, %11
  br i1 %12, label %13, label %38

13:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 2, ptr %8) #2
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = load i32, ptr %7, align 4, !tbaa !9
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds i16, ptr %14, i64 %16
  %18 = load i16, ptr %17, align 2, !tbaa !11
  store i16 %18, ptr %8, align 2, !tbaa !11
  %19 = load i16, ptr %8, align 2, !tbaa !11
  %20 = zext i16 %19 to i32
  %21 = and i32 %20, 65280
  %22 = trunc i32 %21 to i16
  %23 = zext i16 %22 to i32
  %24 = ashr i32 %23, 8
  %25 = load i16, ptr %8, align 2, !tbaa !11
  %26 = zext i16 %25 to i32
  %27 = and i32 %26, 255
  %28 = shl i32 %27, 8
  %29 = or i32 %24, %28
  %30 = trunc i32 %29 to i16
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = load i32, ptr %7, align 4, !tbaa !9
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds i16, ptr %31, i64 %33
  store i16 %30, ptr %34, align 2, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 2, ptr %8) #2
  br label %35

35:                                               ; preds = %13
  %36 = load i32, ptr %7, align 4, !tbaa !9
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %7, align 4, !tbaa !9
  br label %9, !llvm.loop !13

38:                                               ; preds = %9
  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 = !{!"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 = !{!"short", !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 @flip2(ptr nocapture noundef readonly %0, ptr nocapture noundef writeonly %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 = ptrtoint ptr %1 to i64
  %6 = ptrtoint ptr %0 to i64
  %wide.trip.count = zext nneg i32 %2 to i64
  %min.iters.check = icmp ult i32 %2, 16
  %7 = sub i64 %5, %6
  %diff.check = icmp ult i64 %7, 32
  %or.cond = or i1 %min.iters.check, %diff.check
  br i1 %or.cond, label %.lr.ph.preheader11, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 2147483632
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %8 = getelementptr inbounds i16, ptr %0, i64 %index
  %9 = getelementptr inbounds i8, ptr %8, i64 16
  %wide.load = load <8 x i16>, ptr %8, align 2, !tbaa !5
  %wide.load10 = load <8 x i16>, ptr %9, align 2, !tbaa !5
  %10 = tail call <8 x i16> @llvm.bswap.v8i16(<8 x i16> %wide.load)
  %11 = tail call <8 x i16> @llvm.bswap.v8i16(<8 x i16> %wide.load10)
  %12 = getelementptr inbounds i16, ptr %1, i64 %index
  %13 = getelementptr inbounds i8, ptr %12, i64 16
  store <8 x i16> %10, ptr %12, align 2, !tbaa !5
  store <8 x i16> %11, ptr %13, align 2, !tbaa !5
  %index.next = add nuw i64 %index, 16
  %14 = icmp eq i64 %index.next, %n.vec
  br i1 %14, label %middle.block, label %vector.body, !llvm.loop !9

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.preheader11

.lr.ph.preheader11:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 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.preheader11, %.lr.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %.lr.ph.prol ], [ %indvars.iv.ph, %.lr.ph.preheader11 ]
  %prol.iter = phi i64 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader11 ]
  %15 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv.prol
  %16 = load i16, ptr %15, align 2, !tbaa !5
  %rev.prol = tail call i16 @llvm.bswap.i16(i16 %16)
  %17 = getelementptr inbounds i16, ptr %1, i64 %indvars.iv.prol
  store i16 %rev.prol, ptr %17, align 2, !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.preheader11
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.lr.ph.preheader11 ], [ %indvars.iv.next.prol, %.lr.ph.prol ]
  %18 = sub nsw i64 %indvars.iv.ph, %wide.trip.count
  %19 = icmp ugt i64 %18, -4
  br i1 %19, label %._crit_edge, 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 ]
  %20 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv
  %21 = load i16, ptr %20, align 2, !tbaa !5
  %rev = tail call i16 @llvm.bswap.i16(i16 %21)
  %22 = getelementptr inbounds i16, ptr %1, i64 %indvars.iv
  store i16 %rev, ptr %22, align 2, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %23 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv.next
  %24 = load i16, ptr %23, align 2, !tbaa !5
  %rev.1 = tail call i16 @llvm.bswap.i16(i16 %24)
  %25 = getelementptr inbounds i16, ptr %1, i64 %indvars.iv.next
  store i16 %rev.1, ptr %25, align 2, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %26 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv.next.1
  %27 = load i16, ptr %26, align 2, !tbaa !5
  %rev.2 = tail call i16 @llvm.bswap.i16(i16 %27)
  %28 = getelementptr inbounds i16, ptr %1, i64 %indvars.iv.next.1
  store i16 %rev.2, ptr %28, align 2, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %29 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv.next.2
  %30 = load i16, ptr %29, align 2, !tbaa !5
  %rev.3 = tail call i16 @llvm.bswap.i16(i16 %30)
  %31 = getelementptr inbounds i16, ptr %1, i64 %indvars.iv.next.2
  store i16 %rev.3, ptr %31, align 2, !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, label %.lr.ph, !llvm.loop !15

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

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i16 @llvm.bswap.i16(i16) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <8 x i16> @llvm.bswap.v8i16(<8 x i16>) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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 = !{!"short", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.unroll.disable"}
!15 = distinct !{!15, !10, !11}


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