; LLVM IR from DataManagementLab/ScaleStore :: backend/scalestore/utils/FNVHash.ll (ZN10scalestore5utils3FNV4hashEm)

; 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 noundef i64 @_ZN10scalestore5utils3FNV4hashEm(i64 noundef %0) #1 align 2 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  %5 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store i64 -3750763034362895579, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %20, %1
  %7 = load i32, ptr %4, align 4, !tbaa !9
  %8 = icmp slt i32 %7, 8
  br i1 %8, label %10, label %9

9:                                                ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %23

10:                                               ; preds = %6
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %11 = load i64, ptr %2, align 8, !tbaa !5
  %12 = and i64 %11, 255
  store i64 %12, ptr %5, align 8, !tbaa !5
  %13 = load i64, ptr %2, align 8, !tbaa !5
  %14 = lshr i64 %13, 8
  store i64 %14, ptr %2, align 8, !tbaa !5
  %15 = load i64, ptr %3, align 8, !tbaa !5
  %16 = load i64, ptr %5, align 8, !tbaa !5
  %17 = xor i64 %15, %16
  store i64 %17, ptr %3, align 8, !tbaa !5
  %18 = load i64, ptr %3, align 8, !tbaa !5
  %19 = mul i64 %18, 1099511628211
  store i64 %19, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  br label %20

20:                                               ; preds = %10
  %21 = load i32, ptr %4, align 4, !tbaa !9
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %4, align 4, !tbaa !9
  br label %6, !llvm.loop !11

23:                                               ; preds = %9
  %24 = load i64, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i64 %24
}

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 = !{!"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 = 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 willreturn memory(none) uwtable
define dso_local noundef i64 @_ZN10scalestore5utils3FNV4hashEm(i64 noundef %0) local_unnamed_addr #0 align 2 {
  %2 = and i64 %0, 255
  %3 = lshr i64 %0, 8
  %4 = xor i64 %2, -3750763034362895579
  %5 = mul i64 %4, 1099511628211
  %6 = and i64 %3, 255
  %7 = lshr i64 %0, 16
  %8 = xor i64 %6, %5
  %9 = mul i64 %8, 1099511628211
  %10 = and i64 %7, 255
  %11 = lshr i64 %0, 24
  %12 = xor i64 %10, %9
  %13 = mul i64 %12, 1099511628211
  %14 = and i64 %11, 255
  %15 = lshr i64 %0, 32
  %16 = xor i64 %14, %13
  %17 = mul i64 %16, 1099511628211
  %18 = and i64 %15, 255
  %19 = lshr i64 %0, 40
  %20 = xor i64 %18, %17
  %21 = mul i64 %20, 1099511628211
  %22 = and i64 %19, 255
  %23 = lshr i64 %0, 48
  %24 = xor i64 %22, %21
  %25 = mul i64 %24, 1099511628211
  %26 = and i64 %23, 255
  %27 = lshr i64 %0, 56
  %28 = xor i64 %26, %25
  %29 = mul i64 %28, 1099511628211
  %30 = xor i64 %27, %29
  %31 = mul i64 %30, 1099511628211
  ret i64 %31
}

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)"}


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