; LLVM IR from LinearTapeFileSystem/ltfs :: src/tape_drivers (reed_solomon_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"

@ltfs_log_level = external global i32, align 4
@.str = external hidden unnamed_addr constant [7 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [7 x i8], align 1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: inlinehint nounwind uwtable
declare hidden void @enc4(i8 noundef zeroext, ptr noundef) #1

; Function Attrs: inlinehint nounwind uwtable
declare hidden i32 @__bswap_32(i32 noundef) #1

declare i32 @ltfsmsg_internal(i1 noundef zeroext, i32 noundef, ptr noundef, ptr noundef, ...) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local void @rs_gf256_enc(ptr noundef %0, i64 noundef %1) #3 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i64, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %9, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = load i64, ptr %4, align 8, !tbaa !9
  %12 = getelementptr inbounds i8, ptr %10, i64 %11
  store ptr %12, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  store i32 0, ptr %7, align 4, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  store i64 0, ptr %8, align 8, !tbaa !9
  br label %13

13:                                               ; preds = %22, %2
  %14 = load i64, ptr %8, align 8, !tbaa !9
  %15 = load i64, ptr %4, align 8, !tbaa !9
  %16 = icmp ult i64 %14, %15
  br i1 %16, label %17, label %25

17:                                               ; preds = %13
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = load i8, ptr %18, align 1, !tbaa !13
  call void @enc4(i8 noundef zeroext %19, ptr noundef %7)
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = getelementptr inbounds i8, ptr %20, i32 1
  store ptr %21, ptr %5, align 8, !tbaa !5
  br label %22

22:                                               ; preds = %17
  %23 = load i64, ptr %8, align 8, !tbaa !9
  %24 = add i64 %23, 1
  store i64 %24, ptr %8, align 8, !tbaa !9
  br label %13, !llvm.loop !14

25:                                               ; preds = %13
  br label %26

26:                                               ; preds = %25
  %27 = load i32, ptr %7, align 4, !tbaa !11
  %28 = call i32 @__bswap_32(i32 noundef %27)
  %29 = load ptr, ptr %6, align 8, !tbaa !5
  store i32 %28, ptr %29, align 4, !tbaa !11
  br label %30

30:                                               ; preds = %26
  br label %31

31:                                               ; preds = %30
  br label %32

32:                                               ; preds = %31
  %33 = load i32, ptr @ltfs_log_level, align 4, !tbaa !11
  %34 = icmp sle i32 3, %33
  br i1 %34, label %35, label %40

35:                                               ; preds = %32
  %36 = load i64, ptr %4, align 8, !tbaa !9
  %37 = trunc i64 %36 to i32
  %38 = load i32, ptr %7, align 4, !tbaa !11
  %39 = call i32 (i1, i32, ptr, ptr, ...) @ltfsmsg_internal(i1 noundef zeroext true, i32 noundef 3, ptr noundef null, ptr noundef @.str, ptr noundef @.str.1, i32 noundef %37, i32 noundef %38)
  br label %40

40:                                               ; preds = %35, %32
  br label %41

41:                                               ; preds = %40
  br label %42

42:                                               ; preds = %41
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint 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 = { "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 #3 = { 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 #4 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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"

@ltfs_log_level = external local_unnamed_addr global i32, align 4
@.str = external hidden unnamed_addr constant [7 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [7 x i8], align 1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: inlinehint nounwind uwtable
declare hidden void @enc4(i8 noundef zeroext, ptr noundef) local_unnamed_addr #1

; Function Attrs: inlinehint nounwind uwtable
declare hidden i32 @__bswap_32(i32 noundef) local_unnamed_addr #1

declare i32 @ltfsmsg_internal(i1 noundef zeroext, i32 noundef, ptr noundef, ptr noundef, ...) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local void @rs_gf256_enc(ptr nocapture noundef %0, i64 noundef %1) local_unnamed_addr #3 {
  %3 = alloca i32, align 4
  %4 = getelementptr inbounds i8, ptr %0, i64 %1
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #4
  store i32 0, ptr %3, align 4, !tbaa !5
  %.not = icmp eq i64 %1, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.012 = phi i64 [ %7, %.lr.ph ], [ 0, %2 ]
  %.0911 = phi ptr [ %6, %.lr.ph ], [ %0, %2 ]
  %5 = load i8, ptr %.0911, align 1, !tbaa !9
  call void @enc4(i8 noundef zeroext %5, ptr noundef nonnull %3)
  %6 = getelementptr inbounds i8, ptr %.0911, i64 1
  %7 = add nuw i64 %.012, 1
  %exitcond.not = icmp eq i64 %7, %1
  br i1 %exitcond.not, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !10

._crit_edge.loopexit:                             ; preds = %.lr.ph
  %.pre = load i32, ptr %3, align 4, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %2
  %8 = phi i32 [ %.pre, %._crit_edge.loopexit ], [ 0, %2 ]
  %9 = call i32 @__bswap_32(i32 noundef %8)
  store i32 %9, ptr %4, align 4, !tbaa !5
  %10 = load i32, ptr @ltfs_log_level, align 4, !tbaa !5
  %11 = icmp sgt i32 %10, 2
  br i1 %11, label %12, label %16

12:                                               ; preds = %._crit_edge
  %13 = trunc i64 %1 to i32
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = call i32 (i1, i32, ptr, ptr, ...) @ltfsmsg_internal(i1 noundef zeroext true, i32 noundef 3, ptr noundef null, ptr noundef nonnull @.str, ptr noundef nonnull @.str.1, i32 noundef %13, i32 noundef %14) #4
  br label %16

16:                                               ; preds = %12, %._crit_edge
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #4
  ret void
}

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint 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 = { "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 #3 = { 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 #4 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass