; LLVM IR from jgaeddert/liquid-dsp :: src/fec/src (fec_hamming84)

; 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"

@hamming84_enc_gentab = external dso_local global [16 x i8], align 16

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

; Function Attrs: nounwind uwtable
define dso_local i32 @fec_hamming84_encode(ptr noundef %0, i32 noundef %1, ptr noundef %2, ptr noundef %3) #1 {
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i8, align 1
  %12 = alloca i8, align 1
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store ptr %2, ptr %7, align 8, !tbaa !5
  store ptr %3, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 0, ptr %10, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 1, ptr %11) #2
  call void @llvm.lifetime.start.p0(i64 1, ptr %12) #2
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %13

13:                                               ; preds = %56, %4
  %14 = load i32, ptr %9, align 4, !tbaa !9
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = icmp ult i32 %14, %15
  br i1 %16, label %17, label %59

17:                                               ; preds = %13
  %18 = load ptr, ptr %7, align 8, !tbaa !5
  %19 = load i32, ptr %9, align 4, !tbaa !9
  %20 = zext i32 %19 to i64
  %21 = getelementptr inbounds i8, ptr %18, i64 %20
  %22 = load i8, ptr %21, align 1, !tbaa !11
  %23 = zext i8 %22 to i32
  %24 = ashr i32 %23, 4
  %25 = and i32 %24, 15
  %26 = trunc i32 %25 to i8
  store i8 %26, ptr %11, align 1, !tbaa !11
  %27 = load ptr, ptr %7, align 8, !tbaa !5
  %28 = load i32, ptr %9, align 4, !tbaa !9
  %29 = zext i32 %28 to i64
  %30 = getelementptr inbounds i8, ptr %27, i64 %29
  %31 = load i8, ptr %30, align 1, !tbaa !11
  %32 = zext i8 %31 to i32
  %33 = ashr i32 %32, 0
  %34 = and i32 %33, 15
  %35 = trunc i32 %34 to i8
  store i8 %35, ptr %12, align 1, !tbaa !11
  %36 = load i8, ptr %11, align 1, !tbaa !11
  %37 = zext i8 %36 to i64
  %38 = getelementptr inbounds [16 x i8], ptr @hamming84_enc_gentab, i64 0, i64 %37
  %39 = load i8, ptr %38, align 1, !tbaa !11
  %40 = load ptr, ptr %8, align 8, !tbaa !5
  %41 = load i32, ptr %10, align 4, !tbaa !9
  %42 = add i32 %41, 0
  %43 = zext i32 %42 to i64
  %44 = getelementptr inbounds i8, ptr %40, i64 %43
  store i8 %39, ptr %44, align 1, !tbaa !11
  %45 = load i8, ptr %12, align 1, !tbaa !11
  %46 = zext i8 %45 to i64
  %47 = getelementptr inbounds [16 x i8], ptr @hamming84_enc_gentab, i64 0, i64 %46
  %48 = load i8, ptr %47, align 1, !tbaa !11
  %49 = load ptr, ptr %8, align 8, !tbaa !5
  %50 = load i32, ptr %10, align 4, !tbaa !9
  %51 = add i32 %50, 1
  %52 = zext i32 %51 to i64
  %53 = getelementptr inbounds i8, ptr %49, i64 %52
  store i8 %48, ptr %53, align 1, !tbaa !11
  %54 = load i32, ptr %10, align 4, !tbaa !9
  %55 = add i32 %54, 2
  store i32 %55, ptr %10, align 4, !tbaa !9
  br label %56

56:                                               ; preds = %17
  %57 = load i32, ptr %9, align 4, !tbaa !9
  %58 = add i32 %57, 1
  store i32 %58, ptr %9, align 4, !tbaa !9
  br label %13, !llvm.loop !12

59:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 1, ptr %12) #2
  call void @llvm.lifetime.end.p0(i64 1, ptr %11) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  ret i32 0
}

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

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

@hamming84_enc_gentab = external dso_local local_unnamed_addr global [16 x i8], align 16

; Function Attrs: nofree norecurse nosync nounwind memory(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local noundef i32 @fec_hamming84_encode(ptr nocapture noundef readnone %0, i32 noundef %1, ptr nocapture noundef readonly %2, ptr nocapture noundef writeonly %3) local_unnamed_addr #0 {
  %.not = icmp eq i32 %1, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %4
  %wide.trip.count = zext i32 %1 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %.01314 = phi i32 [ 0, %.lr.ph.preheader ], [ %20, %.lr.ph ]
  %5 = getelementptr inbounds i8, ptr %2, i64 %indvars.iv
  %6 = load i8, ptr %5, align 1, !tbaa !5
  %7 = lshr i8 %6, 4
  %8 = and i8 %6, 15
  %9 = zext nneg i8 %7 to i64
  %10 = getelementptr inbounds [16 x i8], ptr @hamming84_enc_gentab, i64 0, i64 %9
  %11 = load i8, ptr %10, align 1, !tbaa !5
  %12 = zext i32 %.01314 to i64
  %13 = getelementptr inbounds i8, ptr %3, i64 %12
  store i8 %11, ptr %13, align 1, !tbaa !5
  %14 = zext nneg i8 %8 to i64
  %15 = getelementptr inbounds [16 x i8], ptr @hamming84_enc_gentab, i64 0, i64 %14
  %16 = load i8, ptr %15, align 1, !tbaa !5
  %17 = or disjoint i32 %.01314, 1
  %18 = zext i32 %17 to i64
  %19 = getelementptr inbounds i8, ptr %3, i64 %18
  store i8 %16, ptr %19, align 1, !tbaa !5
  %20 = add i32 %.01314, 2
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !8

._crit_edge:                                      ; preds = %.lr.ph, %4
  ret i32 0
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, argmem: readwrite, inaccessiblemem: 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 = !{!6, !6, i64 0}
!6 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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