; LLVM IR from penn-graphics-research/HOT :: Lib/SPGrid/Core/SPGrid_Utilities.ll (ZN6SPGrid8Bit_PackEmm)

; 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"

%union.anon = type { i64 }

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_ZN6SPGrid8Bit_PackEmm(i64 noundef %0, i64 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca %union.anon, align 8
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  %8 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %9 = load i64, ptr %3, align 8, !tbaa !5
  store i64 %9, 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
  store i64 0, ptr %5, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  store i64 1, ptr %8, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %32, %2
  %11 = load i64, ptr %8, align 8, !tbaa !5
  %12 = icmp ne i64 %11, 0
  br i1 %12, label %14, label %13

13:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  br label %35

14:                                               ; preds = %10
  %15 = load i64, ptr %8, align 8, !tbaa !5
  %16 = load i64, ptr %4, align 8, !tbaa !5
  %17 = and i64 %15, %16
  %18 = icmp ne i64 %17, 0
  br i1 %18, label %19, label %28

19:                                               ; preds = %14
  %20 = load i64, ptr %6, align 8, !tbaa !5
  %21 = load i64, ptr %8, align 8, !tbaa !5
  %22 = and i64 %20, %21
  %23 = load i32, ptr %7, align 4, !tbaa !9
  %24 = zext i32 %23 to i64
  %25 = lshr i64 %22, %24
  %26 = load i64, ptr %5, align 8, !tbaa !11
  %27 = or i64 %26, %25
  store i64 %27, ptr %5, align 8, !tbaa !11
  br label %31

28:                                               ; preds = %14
  %29 = load i32, ptr %7, align 4, !tbaa !9
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %7, align 4, !tbaa !9
  br label %31

31:                                               ; preds = %28, %19
  br label %32

32:                                               ; preds = %31
  %33 = load i64, ptr %8, align 8, !tbaa !5
  %34 = shl i64 %33, 1
  store i64 %34, ptr %8, align 8, !tbaa !5
  br label %10, !llvm.loop !12

35:                                               ; preds = %13
  %36 = load i64, ptr %5, align 8, !tbaa !11
  %37 = trunc i64 %36 to i32
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret i32 %37
}

; 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 = { 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 #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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple 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: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i32 @_ZN6SPGrid8Bit_PackEmm(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  br label %5

3:                                                ; preds = %5
  %4 = trunc i64 %.sroa.0.1.1 to i32
  ret i32 %4

5:                                                ; preds = %5, %2
  %.014 = phi i64 [ 1, %2 ], [ %19, %5 ]
  %.01013 = phi i32 [ 0, %2 ], [ %.1.1, %5 ]
  %.sroa.0.012 = phi i64 [ 0, %2 ], [ %.sroa.0.1.1, %5 ]
  %6 = and i64 %.014, %1
  %.not11 = icmp eq i64 %6, 0
  %7 = and i64 %.014, %0
  %8 = zext nneg i32 %.01013 to i64
  %9 = lshr i64 %7, %8
  %10 = select i1 %.not11, i64 0, i64 %9
  %.sroa.0.1 = or i64 %10, %.sroa.0.012
  %11 = zext i1 %.not11 to i32
  %.1 = add nuw nsw i32 %.01013, %11
  %12 = shl i64 %.014, 1
  %13 = and i64 %12, %1
  %.not11.1 = icmp eq i64 %13, 0
  %14 = and i64 %12, %0
  %15 = zext nneg i32 %.1 to i64
  %16 = lshr i64 %14, %15
  %17 = select i1 %.not11.1, i64 0, i64 %16
  %.sroa.0.1.1 = or i64 %17, %.sroa.0.1
  %18 = zext i1 %.not11.1 to i32
  %.1.1 = add nuw nsw i32 %.1, %18
  %19 = shl i64 %.014, 2
  %.not.1 = icmp eq i64 %19, 0
  br i1 %.not.1, label %3, label %5, !llvm.loop !5
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass