; LLVM IR from freakout42/macrocalc :: mc/mex (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.BUFFER = type { ptr, ptr, i32, ptr, i32, ptr, i32, i32, [128 x i8], [128 x i8] }

@oldbp = external global ptr, align 8
@bheadp = external global ptr, align 8

; 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: nounwind uwtable
define dso_local void @freebuf(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct.BUFFER, ptr %5, i32 0, i32 5
  %7 = load ptr, ptr %6, align 8, !tbaa !9
  call void @free(ptr noundef %7) #3
  store ptr null, ptr %4, align 8, !tbaa !5
  %8 = load ptr, ptr @bheadp, align 8, !tbaa !5
  store ptr %8, ptr %3, align 8, !tbaa !5
  br label %9

9:                                                ; preds = %13, %1
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = load ptr, ptr %2, align 8, !tbaa !5
  %12 = icmp ne ptr %10, %11
  br i1 %12, label %13, label %18

13:                                               ; preds = %9
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %14, ptr %4, align 8, !tbaa !5
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.BUFFER, ptr %15, i32 0, i32 0
  %17 = load ptr, ptr %16, align 8, !tbaa !12
  store ptr %17, ptr %3, align 8, !tbaa !5
  br label %9, !llvm.loop !13

18:                                               ; preds = %9
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.BUFFER, ptr %19, i32 0, i32 0
  %21 = load ptr, ptr %20, align 8, !tbaa !12
  store ptr %21, ptr %3, align 8, !tbaa !5
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = icmp eq ptr %22, null
  br i1 %23, label %24, label %26

24:                                               ; preds = %18
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %25, ptr @bheadp, align 8, !tbaa !5
  br label %30

26:                                               ; preds = %18
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.BUFFER, ptr %28, i32 0, i32 0
  store ptr %27, ptr %29, align 8, !tbaa !12
  br label %30

30:                                               ; preds = %26, %24
  %31 = load ptr, ptr %2, align 8, !tbaa !5
  call void @free(ptr noundef %31) #3
  %32 = load ptr, ptr @oldbp, align 8, !tbaa !5
  %33 = load ptr, ptr %2, align 8, !tbaa !5
  %34 = icmp eq ptr %32, %33
  br i1 %34, label %35, label %36

35:                                               ; preds = %30
  store ptr null, ptr @oldbp, align 8, !tbaa !5
  br label %36

36:                                               ; preds = %35, %30
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret void
}

; Function Attrs: nounwind
declare void @free(ptr noundef) #2

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 "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 }

!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, !6, i64 40}
!10 = !{!"BUFFER", !6, i64 0, !6, i64 8, !11, i64 16, !6, i64 24, !11, i64 32, !6, i64 40, !11, i64 48, !11, i64 52, !7, i64 56, !7, i64 184}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, 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"

@oldbp = external local_unnamed_addr global ptr, align 8
@bheadp = external local_unnamed_addr global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local void @freebuf(ptr noundef %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 40
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  tail call void @free(ptr noundef %3) #2
  br label %4

4:                                                ; preds = %4, %1
  %.012.in = phi ptr [ @bheadp, %1 ], [ %.012, %4 ]
  %.0 = phi ptr [ null, %1 ], [ %.012, %4 ]
  %.012 = load ptr, ptr %.012.in, align 8, !tbaa !11
  %.not = icmp eq ptr %.012, %0
  br i1 %.not, label %5, label %4, !llvm.loop !12

5:                                                ; preds = %4
  %6 = load ptr, ptr %.012, align 8, !tbaa !14
  %7 = icmp eq ptr %.0, null
  %bheadp..0.lcssa = select i1 %7, ptr @bheadp, ptr %.0
  store ptr %6, ptr %bheadp..0.lcssa, align 8, !tbaa !11
  tail call void @free(ptr noundef %0) #2
  %8 = load ptr, ptr @oldbp, align 8, !tbaa !11
  %9 = icmp eq ptr %8, %0
  br i1 %9, label %10, label %11

10:                                               ; preds = %5
  store ptr null, ptr @oldbp, align 8, !tbaa !11
  br label %11

11:                                               ; preds = %10, %5
  ret void
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #1

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 nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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, !7, i64 40}
!6 = !{!"BUFFER", !7, i64 0, !7, i64 8, !10, i64 16, !7, i64 24, !10, i64 32, !7, i64 40, !10, i64 48, !10, i64 52, !8, i64 56, !8, i64 184}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!6, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass