; LLVM IR from stamparm/cryptospecs :: hash/sources (crc)

; 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 @reflect(i64 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 1, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  store i64 0, ptr %7, align 8, !tbaa !5
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = sub nsw i32 %8, 1
  %10 = zext i32 %9 to i64
  %11 = shl i64 1, %10
  store i64 %11, ptr %5, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %27, %2
  %13 = load i64, ptr %5, align 8, !tbaa !5
  %14 = icmp ne i64 %13, 0
  br i1 %14, label %15, label %30

15:                                               ; preds = %12
  %16 = load i64, ptr %3, align 8, !tbaa !5
  %17 = load i64, ptr %5, align 8, !tbaa !5
  %18 = and i64 %16, %17
  %19 = icmp ne i64 %18, 0
  br i1 %19, label %20, label %24

20:                                               ; preds = %15
  %21 = load i64, ptr %6, align 8, !tbaa !5
  %22 = load i64, ptr %7, align 8, !tbaa !5
  %23 = or i64 %22, %21
  store i64 %23, ptr %7, align 8, !tbaa !5
  br label %24

24:                                               ; preds = %20, %15
  %25 = load i64, ptr %6, align 8, !tbaa !5
  %26 = shl i64 %25, 1
  store i64 %26, ptr %6, align 8, !tbaa !5
  br label %27

27:                                               ; preds = %24
  %28 = load i64, ptr %5, align 8, !tbaa !5
  %29 = lshr i64 %28, 1
  store i64 %29, ptr %5, align 8, !tbaa !5
  br label %12, !llvm.loop !11

30:                                               ; preds = %12
  %31 = load i64, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, 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 i64 %31
}

; 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 @reflect(i64 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = add nsw i32 %1, -1
  %4 = zext nneg i32 %3 to i64
  %5 = shl nuw i64 1, %4
  br label %6

6:                                                ; preds = %2, %6
  %.014 = phi i64 [ 0, %2 ], [ %spec.select, %6 ]
  %.0913 = phi i64 [ 1, %2 ], [ %9, %6 ]
  %.01012 = phi i64 [ %5, %2 ], [ %10, %6 ]
  %7 = and i64 %.01012, %0
  %.not11 = icmp eq i64 %7, 0
  %8 = select i1 %.not11, i64 0, i64 %.0913
  %spec.select = or i64 %8, %.014
  %9 = shl i64 %.0913, 1
  %10 = lshr i64 %.01012, 1
  %.not = icmp ult i64 %.01012, 2
  br i1 %.not, label %11, label %6, !llvm.loop !5

11:                                               ; preds = %6
  ret i64 %spec.select
}

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,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass