; LLVM IR from tangjz/acm-icpc :: TDL_training/2016-04-17/I - Hash function - tjz.ll (Z3XorRji)

; 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 @_Z3XorRji(ptr noundef nonnull align 4 dereferenceable(4) %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 32, ptr %6, align 4, !tbaa !9
  br label %7

7:                                                ; preds = %42, %2
  %8 = load i32, ptr %6, align 4, !tbaa !9
  %9 = icmp sgt i32 %8, 0
  br i1 %9, label %11, label %10

10:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %46

11:                                               ; preds = %7
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = load i32, ptr %12, align 4, !tbaa !9
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = load i32, ptr %4, align 4, !tbaa !9
  %16 = lshr i32 %14, %15
  %17 = xor i32 %13, %16
  %18 = load i32, ptr %6, align 4, !tbaa !9
  %19 = load i32, ptr %4, align 4, !tbaa !9
  %20 = icmp sge i32 %18, %19
  br i1 %20, label %21, label %29

21:                                               ; preds = %11
  %22 = load i32, ptr %4, align 4, !tbaa !9
  %23 = shl i32 1, %22
  %24 = sub i32 %23, 1
  %25 = load i32, ptr %6, align 4, !tbaa !9
  %26 = load i32, ptr %4, align 4, !tbaa !9
  %27 = sub nsw i32 %25, %26
  %28 = shl i32 %24, %27
  br label %37

29:                                               ; preds = %11
  %30 = load i32, ptr %4, align 4, !tbaa !9
  %31 = shl i32 1, %30
  %32 = sub i32 %31, 1
  %33 = load i32, ptr %4, align 4, !tbaa !9
  %34 = load i32, ptr %6, align 4, !tbaa !9
  %35 = sub nsw i32 %33, %34
  %36 = lshr i32 %32, %35
  br label %37

37:                                               ; preds = %29, %21
  %38 = phi i32 [ %28, %21 ], [ %36, %29 ]
  %39 = and i32 %17, %38
  %40 = load i32, ptr %5, align 4, !tbaa !9
  %41 = or i32 %40, %39
  store i32 %41, ptr %5, align 4, !tbaa !9
  br label %42

42:                                               ; preds = %37
  %43 = load i32, ptr %4, align 4, !tbaa !9
  %44 = load i32, ptr %6, align 4, !tbaa !9
  %45 = sub nsw i32 %44, %43
  store i32 %45, ptr %6, align 4, !tbaa !9
  br label %7, !llvm.loop !11

46:                                               ; preds = %10
  %47 = load i32, ptr %5, align 4, !tbaa !9
  %48 = load ptr, ptr %3, align 8, !tbaa !5
  store i32 %47, ptr %48, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  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 = 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: mustprogress nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local void @_Z3XorRji(ptr nocapture noundef nonnull align 4 dereferenceable(4) %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = load i32, ptr %0, align 4, !tbaa !5
  %notmask18 = shl nsw i32 -1, %1
  %4 = xor i32 %notmask18, -1
  br label %6

5:                                                ; preds = %6
  store i32 %15, ptr %0, align 4, !tbaa !5
  ret void

6:                                                ; preds = %2, %6
  %.020 = phi i32 [ 32, %2 ], [ %9, %6 ]
  %.01619 = phi i32 [ 0, %2 ], [ %15, %6 ]
  %7 = lshr i32 %.01619, %1
  %8 = xor i32 %3, %7
  %.not = icmp slt i32 %.020, %1
  %9 = sub nsw i32 %.020, %1
  %10 = shl i32 %4, %9
  %11 = sub nsw i32 %1, %.020
  %12 = lshr i32 %4, %11
  %13 = select i1 %.not, i32 %12, i32 %10
  %14 = and i32 %13, %8
  %15 = or i32 %14, %.01619
  %16 = icmp sgt i32 %9, 0
  br i1 %16, label %6, label %5, !llvm.loop !9
}

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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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