; LLVM IR from mncoppola/rpef :: utilities_src/squashfs2.1/lzma/C/Common/CRC.ll (ZN4CCRC12UpdateUInt32Ej)

; 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
declare dso_local void @_ZN4CCRC10UpdateByteEh(ptr noundef nonnull align 4 dereferenceable(4), i8 noundef zeroext) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN4CCRC12UpdateUInt32Ej(ptr noundef nonnull align 4 dereferenceable(4) %0, i32 noundef %1) #1 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %6 = load ptr, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %7

7:                                                ; preds = %17, %2
  %8 = load i32, ptr %5, align 4, !tbaa !9
  %9 = icmp slt i32 %8, 4
  br i1 %9, label %11, label %10

10:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %20

11:                                               ; preds = %7
  %12 = load i32, ptr %4, align 4, !tbaa !9
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = mul nsw i32 8, %13
  %15 = lshr i32 %12, %14
  %16 = trunc i32 %15 to i8
  call void @_ZN4CCRC10UpdateByteEh(ptr noundef nonnull align 4 dereferenceable(4) %6, i8 noundef zeroext %16)
  br label %17

17:                                               ; preds = %11
  %18 = load i32, ptr %5, align 4, !tbaa !9
  %19 = add nsw i32 %18, 1
  store i32 %19, ptr %5, align 4, !tbaa !9
  br label %7, !llvm.loop !11

20:                                               ; preds = %10
  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 nounwind uwtable
declare dso_local void @_ZN4CCRC10UpdateByteEh(ptr noundef nonnull align 4 dereferenceable(4), i8 noundef zeroext) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN4CCRC12UpdateUInt32Ej(ptr noundef nonnull align 4 dereferenceable(4) %0, i32 noundef %1) local_unnamed_addr #0 align 2 {
  %3 = trunc i32 %1 to i8
  tail call void @_ZN4CCRC10UpdateByteEh(ptr noundef nonnull align 4 dereferenceable(4) %0, i8 noundef zeroext %3)
  %4 = lshr i32 %1, 8
  %5 = trunc i32 %4 to i8
  tail call void @_ZN4CCRC10UpdateByteEh(ptr noundef nonnull align 4 dereferenceable(4) %0, i8 noundef zeroext %5)
  %6 = lshr i32 %1, 16
  %7 = trunc i32 %6 to i8
  tail call void @_ZN4CCRC10UpdateByteEh(ptr noundef nonnull align 4 dereferenceable(4) %0, i8 noundef zeroext %7)
  %8 = lshr i32 %1, 24
  %9 = trunc nuw i32 %8 to i8
  tail call void @_ZN4CCRC10UpdateByteEh(ptr noundef nonnull align 4 dereferenceable(4) %0, i8 noundef zeroext %9)
  ret void
}

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" }

!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,LoopRotatePass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass