; LLVM IR from quixdb/squash :: plugins/snappy (crc32)

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

9:                                                ; preds = %22, %2
  %10 = load i32, ptr %5, align 4, !tbaa !9
  %11 = zext i32 %10 to i64
  %12 = load i64, ptr %4, align 8, !tbaa !5
  %13 = icmp ult i64 %11, %12
  br i1 %13, label %14, label %25

14:                                               ; preds = %9
  %15 = load i64, ptr %3, align 8, !tbaa !5
  %16 = lshr i64 %15, 1
  store i64 %16, ptr %3, align 8, !tbaa !5
  %17 = load i64, ptr %6, align 8, !tbaa !5
  %18 = shl i64 %17, 1
  %19 = load i64, ptr %3, align 8, !tbaa !5
  %20 = and i64 %19, 1
  %21 = or i64 %18, %20
  store i64 %21, ptr %6, align 8, !tbaa !5
  br label %22

22:                                               ; preds = %14
  %23 = load i32, ptr %5, align 4, !tbaa !9
  %24 = add i32 %23, 1
  store i32 %24, ptr %5, align 4, !tbaa !9
  br label %9, !llvm.loop !11

25:                                               ; preds = %9
  %26 = load i64, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i64 %26
}

; 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 = { 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/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: nofree norecurse nosync nounwind memory(none) uwtable
define dso_local i64 @crc_reflect(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = and i64 %0, 1
  %4 = icmp ugt i64 %1, 1
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.012 = phi i64 [ %8, %.lr.ph ], [ %3, %2 ]
  %.0811 = phi i32 [ %9, %.lr.ph ], [ 1, %2 ]
  %.0910 = phi i64 [ %5, %.lr.ph ], [ %0, %2 ]
  %5 = lshr i64 %.0910, 1
  %6 = shl i64 %.012, 1
  %7 = and i64 %5, 1
  %8 = or disjoint i64 %6, %7
  %9 = add i32 %.0811, 1
  %10 = zext i32 %9 to i64
  %11 = icmp ult i64 %10, %1
  br i1 %11, label %.lr.ph, label %._crit_edge, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.0.lcssa = phi i64 [ %3, %2 ], [ %8, %.lr.ph ]
  ret i64 %.0.lcssa
}

attributes #0 = { nofree norecurse nosync nounwind 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,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass