; LLVM IR from glaretechnologies/substrata :: opus/opus-1.3.1/src (opus)

; 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 i32 @encode_size(i32 noundef %0, ptr noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = icmp slt i32 %6, 252
  br i1 %7, label %8, label %13

8:                                                ; preds = %2
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = trunc i32 %9 to i8
  %11 = load ptr, ptr %5, align 8, !tbaa !9
  %12 = getelementptr inbounds i8, ptr %11, i64 0
  store i8 %10, ptr %12, align 1, !tbaa !11
  store i32 1, ptr %3, align 4
  br label %30

13:                                               ; preds = %2
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = and i32 %14, 3
  %16 = add nsw i32 252, %15
  %17 = trunc i32 %16 to i8
  %18 = load ptr, ptr %5, align 8, !tbaa !9
  %19 = getelementptr inbounds i8, ptr %18, i64 0
  store i8 %17, ptr %19, align 1, !tbaa !11
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = load ptr, ptr %5, align 8, !tbaa !9
  %22 = getelementptr inbounds i8, ptr %21, i64 0
  %23 = load i8, ptr %22, align 1, !tbaa !11
  %24 = zext i8 %23 to i32
  %25 = sub nsw i32 %20, %24
  %26 = ashr i32 %25, 2
  %27 = trunc i32 %26 to i8
  %28 = load ptr, ptr %5, align 8, !tbaa !9
  %29 = getelementptr inbounds i8, ptr %28, i64 1
  store i8 %27, ptr %29, align 1, !tbaa !11
  store i32 2, ptr %3, align 4
  br label %30

30:                                               ; preds = %13, %8
  %31 = load i32, ptr %3, align 4
  ret i32 %31
}

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" }

!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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!7, !7, i64 0}


; 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 nofree norecurse nosync nounwind willreturn memory(argmem: write) uwtable
define dso_local range(i32 1, 3) i32 @encode_size(i32 noundef %0, ptr nocapture noundef writeonly %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %0, 252
  %4 = trunc i32 %0 to i8
  br i1 %3, label %12, label %5

5:                                                ; preds = %2
  %6 = or i8 %4, -4
  %7 = zext i8 %6 to i32
  %8 = sub nsw i32 %0, %7
  %9 = lshr i32 %8, 2
  %10 = trunc i32 %9 to i8
  %11 = getelementptr inbounds i8, ptr %1, i64 1
  store i8 %10, ptr %11, align 1, !tbaa !5
  br label %12

12:                                               ; preds = %2, %5
  %.sink = phi i8 [ %6, %5 ], [ %4, %2 ]
  %.0 = phi i32 [ 2, %5 ], [ 1, %2 ]
  store i8 %.sink, ptr %1, align 1
  ret i32 %.0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write) 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"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InstCombinePass,MergedLoadStoreMotionPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass