; 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] }

@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 i32 @anycb() #1 {
  %1 = alloca i32, align 4
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #2
  %4 = load ptr, ptr @bheadp, align 8, !tbaa !5
  store ptr %4, ptr %2, align 8, !tbaa !5
  br label %5

5:                                                ; preds = %21, %0
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = icmp ne ptr %6, null
  br i1 %7, label %8, label %25

8:                                                ; preds = %5
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.BUFFER, ptr %9, i32 0, i32 7
  %11 = load i32, ptr %10, align 4, !tbaa !9
  %12 = and i32 %11, 1
  %13 = icmp eq i32 %12, 0
  br i1 %13, label %14, label %21

14:                                               ; preds = %8
  %15 = load ptr, ptr %2, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.BUFFER, ptr %15, i32 0, i32 7
  %17 = load i32, ptr %16, align 4, !tbaa !9
  %18 = and i32 %17, 2
  %19 = icmp ne i32 %18, 0
  br i1 %19, label %20, label %21

20:                                               ; preds = %14
  store i32 1, ptr %1, align 4
  store i32 1, ptr %3, align 4
  br label %26

21:                                               ; preds = %14, %8
  %22 = load ptr, ptr %2, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.BUFFER, ptr %22, i32 0, i32 0
  %24 = load ptr, ptr %23, align 8, !tbaa !12
  store ptr %24, ptr %2, align 8, !tbaa !5
  br label %5, !llvm.loop !13

25:                                               ; preds = %5
  store i32 0, ptr %1, align 4
  store i32 1, ptr %3, align 4
  br label %26

26:                                               ; preds = %25, %20
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #2
  %27 = load i32, ptr %1, align 4
  ret i32 %27
}

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, !11, i64 52}
!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"

@bheadp = external local_unnamed_addr global ptr, align 8

; Function Attrs: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local range(i32 0, 2) i32 @anycb() local_unnamed_addr #0 {
  br label %1

1:                                                ; preds = %2, %0
  %.0.in = phi ptr [ @bheadp, %0 ], [ %.0, %2 ]
  %.0 = load ptr, ptr %.0.in, align 8, !tbaa !5
  %.not = icmp eq ptr %.0, null
  br i1 %.not, label %6, label %2

2:                                                ; preds = %1
  %3 = getelementptr inbounds i8, ptr %.0, i64 52
  %4 = load i32, ptr %3, align 4, !tbaa !9
  %5 = and i32 %4, 3
  %or.cond.not = icmp eq i32 %5, 2
  br i1 %or.cond.not, label %6, label %1, !llvm.loop !12

6:                                                ; preds = %1, %2
  %.04 = phi i32 [ 1, %2 ], [ 0, %1 ]
  ret i32 %.04
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 52}
!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 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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