; LLVM IR from zeux/meshoptimizer :: src (vertexcodec)

; 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
define dso_local i32 @meshopt_decodeVertexVersion(ptr noundef %0, i64 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca i8, align 1
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !9
  %9 = load i64, ptr %5, align 8, !tbaa !9
  %10 = icmp ult i64 %9, 1
  br i1 %10, label %11, label %12

11:                                               ; preds = %2
  store i32 -1, ptr %3, align 4
  br label %32

12:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 1, ptr %6) #2
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %13, i64 0
  %15 = load i8, ptr %14, align 1, !tbaa !11
  store i8 %15, ptr %6, align 1, !tbaa !11
  %16 = load i8, ptr %6, align 1, !tbaa !11
  %17 = zext i8 %16 to i32
  %18 = and i32 %17, 240
  %19 = icmp ne i32 %18, 160
  br i1 %19, label %20, label %21

20:                                               ; preds = %12
  store i32 -1, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %31

21:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %22 = load i8, ptr %6, align 1, !tbaa !11
  %23 = zext i8 %22 to i32
  %24 = and i32 %23, 15
  store i32 %24, ptr %8, align 4, !tbaa !12
  %25 = load i32, ptr %8, align 4, !tbaa !12
  %26 = icmp sgt i32 %25, 1
  br i1 %26, label %27, label %28

27:                                               ; preds = %21
  store i32 -1, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %30

28:                                               ; preds = %21
  %29 = load i32, ptr %8, align 4, !tbaa !12
  store i32 %29, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %30

30:                                               ; preds = %28, %27
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %31

31:                                               ; preds = %30, %20
  call void @llvm.lifetime.end.p0(i64 1, ptr %6) #2
  br label %32

32:                                               ; preds = %31, %11
  %33 = load i32, ptr %3, align 4
  ret i32 %33
}

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 = !{!"long", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = !{!13, !13, i64 0}
!13 = !{!"int", !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: read) uwtable
define dso_local range(i32 -1, 2) i32 @meshopt_decodeVertexVersion(ptr nocapture noundef readonly %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq i64 %1, 0
  br i1 %3, label %10, label %4

4:                                                ; preds = %2
  %5 = load i8, ptr %0, align 1, !tbaa !5
  %6 = zext i8 %5 to i32
  %7 = and i32 %6, 240
  %.not = icmp eq i32 %7, 160
  %8 = and i32 %6, 15
  %9 = icmp ugt i32 %8, 1
  %. = select i1 %9, i32 -1, i32 %8
  %.1 = select i1 %.not, i32 %., i32 -1
  br label %10

10:                                               ; preds = %2, %4
  %.2 = phi i32 [ %.1, %4 ], [ -1, %2 ]
  ret i32 %.2
}

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


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