; LLVM IR from caryll/otfcc :: lib/support/buffer (buffer)

; 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"

%struct.__va_list_tag = type { i32, i32, ptr, ptr }

; Function Attrs: nounwind uwtable
declare dso_local ptr @bufnew() #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
declare dso_local void @bufwrite8(ptr noundef, i8 noundef zeroext) #0

; Function Attrs: nounwind uwtable
declare hidden void @bufbeforewrite(ptr noundef, i64 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local ptr @bufninit(i32 noundef %0, ...) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca [1 x %struct.__va_list_tag], align 16
  %5 = alloca i16, align 2
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %6 = call ptr @bufnew()
  store ptr %6, ptr %3, align 8, !tbaa !9
  %7 = load ptr, ptr %3, align 8, !tbaa !9
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = zext i32 %8 to i64
  call void @bufbeforewrite(ptr noundef %7, i64 noundef %9)
  call void @llvm.lifetime.start.p0(i64 24, ptr %4) #3
  %10 = getelementptr inbounds [1 x %struct.__va_list_tag], ptr %4, i64 0, i64 0
  call void @llvm.va_start.p0(ptr %10)
  call void @llvm.lifetime.start.p0(i64 2, ptr %5) #3
  store i16 0, ptr %5, align 2, !tbaa !11
  br label %11

11:                                               ; preds = %36, %1
  %12 = load i16, ptr %5, align 2, !tbaa !11
  %13 = zext i16 %12 to i32
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = icmp ult i32 %13, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 2, ptr %5) #3
  br label %39

17:                                               ; preds = %11
  %18 = load ptr, ptr %3, align 8, !tbaa !9
  %19 = getelementptr inbounds [1 x %struct.__va_list_tag], ptr %4, i64 0, i64 0
  %20 = getelementptr inbounds %struct.__va_list_tag, ptr %19, i32 0, i32 0
  %21 = load i32, ptr %20, align 16
  %22 = icmp ule i32 %21, 40
  br i1 %22, label %23, label %28

23:                                               ; preds = %17
  %24 = getelementptr inbounds %struct.__va_list_tag, ptr %19, i32 0, i32 3
  %25 = load ptr, ptr %24, align 16
  %26 = getelementptr i8, ptr %25, i32 %21
  %27 = add i32 %21, 8
  store i32 %27, ptr %20, align 16
  br label %32

28:                                               ; preds = %17
  %29 = getelementptr inbounds %struct.__va_list_tag, ptr %19, i32 0, i32 2
  %30 = load ptr, ptr %29, align 8
  %31 = getelementptr i8, ptr %30, i32 8
  store ptr %31, ptr %29, align 8
  br label %32

32:                                               ; preds = %28, %23
  %33 = phi ptr [ %26, %23 ], [ %30, %28 ]
  %34 = load i32, ptr %33, align 4, !tbaa !5
  %35 = trunc i32 %34 to i8
  call void @bufwrite8(ptr noundef %18, i8 noundef zeroext %35)
  br label %36

36:                                               ; preds = %32
  %37 = load i16, ptr %5, align 2, !tbaa !11
  %38 = add i16 %37, 1
  store i16 %38, ptr %5, align 2, !tbaa !11
  br label %11, !llvm.loop !13

39:                                               ; preds = %16
  %40 = getelementptr inbounds [1 x %struct.__va_list_tag], ptr %4, i64 0, i64 0
  call void @llvm.va_end.p0(ptr %40)
  %41 = load ptr, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 24, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret ptr %41
}

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.va_start.p0(ptr) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.va_end.p0(ptr) #2

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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nocallback nofree nosync nounwind willreturn }
attributes #3 = { 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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"short", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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"

%struct.__va_list_tag = type { i32, i32, ptr, ptr }

; Function Attrs: nounwind uwtable
declare dso_local ptr @bufnew() local_unnamed_addr #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
declare dso_local void @bufwrite8(ptr noundef, i8 noundef zeroext) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare hidden void @bufbeforewrite(ptr noundef, i64 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef ptr @bufninit(i32 noundef %0, ...) local_unnamed_addr #0 {
  %2 = alloca [1 x %struct.__va_list_tag], align 16
  %3 = tail call ptr @bufnew()
  %4 = zext i32 %0 to i64
  tail call void @bufbeforewrite(ptr noundef %3, i64 noundef %4)
  call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %2) #3
  call void @llvm.va_start.p0(ptr nonnull %2)
  %.not = icmp eq i32 %0, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1
  %5 = getelementptr inbounds i8, ptr %2, i64 8
  %6 = getelementptr inbounds i8, ptr %2, i64 16
  br label %7

._crit_edge:                                      ; preds = %18, %1
  call void @llvm.va_end.p0(ptr nonnull %2)
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %2) #3
  ret ptr %3

7:                                                ; preds = %.lr.ph, %18
  %.07 = phi i16 [ 0, %.lr.ph ], [ %22, %18 ]
  %8 = load i32, ptr %2, align 16
  %9 = icmp ult i32 %8, 41
  br i1 %9, label %10, label %15

10:                                               ; preds = %7
  %11 = load ptr, ptr %6, align 16
  %12 = zext nneg i32 %8 to i64
  %13 = getelementptr i8, ptr %11, i64 %12
  %14 = add nuw nsw i32 %8, 8
  store i32 %14, ptr %2, align 16
  br label %18

15:                                               ; preds = %7
  %16 = load ptr, ptr %5, align 8
  %17 = getelementptr i8, ptr %16, i64 8
  store ptr %17, ptr %5, align 8
  br label %18

18:                                               ; preds = %15, %10
  %19 = phi ptr [ %13, %10 ], [ %16, %15 ]
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = trunc i32 %20 to i8
  call void @bufwrite8(ptr noundef %3, i8 noundef zeroext %21)
  %22 = add i16 %.07, 1
  %23 = zext i16 %22 to i32
  %24 = icmp ult i32 %23, %0
  br i1 %24, label %7, label %._crit_edge, !llvm.loop !9
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare void @llvm.va_start.p0(ptr) #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare void @llvm.va_end.p0(ptr) #2

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" }
attributes #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { mustprogress nocallback nofree nosync nounwind willreturn }
attributes #3 = { 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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