; 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: nounwind uwtable
declare dso_local void @bbclear(ptr noundef) #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
define dso_local void @dtmpbufs() #0 {
  %1 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #2
  %2 = load ptr, ptr @bheadp, align 8, !tbaa !5
  store ptr %2, ptr %1, align 8, !tbaa !5
  br label %3

3:                                                ; preds = %14, %0
  %4 = load ptr, ptr %1, align 8, !tbaa !5
  %5 = icmp ne ptr %4, null
  br i1 %5, label %6, label %18

6:                                                ; preds = %3
  %7 = load ptr, ptr %1, align 8, !tbaa !5
  %8 = getelementptr inbounds %struct.BUFFER, ptr %7, i32 0, i32 7
  %9 = load i32, ptr %8, align 4, !tbaa !9
  %10 = and i32 %9, 1
  %11 = icmp ne i32 %10, 0
  br i1 %11, label %12, label %14

12:                                               ; preds = %6
  %13 = load ptr, ptr %1, align 8, !tbaa !5
  call void @bbclear(ptr noundef %13)
  br label %14

14:                                               ; preds = %12, %6
  %15 = load ptr, ptr %1, 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 %1, align 8, !tbaa !5
  br label %3, !llvm.loop !13

18:                                               ; preds = %3
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #2
  ret void
}

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 = { 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: nounwind uwtable
declare dso_local void @bbclear(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @dtmpbufs() local_unnamed_addr #0 {
  %.05 = load ptr, ptr @bheadp, align 8, !tbaa !5
  %.not6 = icmp eq ptr %.05, null
  br i1 %.not6, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %5
  %.07 = phi ptr [ %.0, %5 ], [ %.05, %0 ]
  %1 = getelementptr inbounds i8, ptr %.07, i64 52
  %2 = load i32, ptr %1, align 4, !tbaa !9
  %3 = and i32 %2, 1
  %.not4 = icmp eq i32 %3, 0
  br i1 %.not4, label %5, label %4

4:                                                ; preds = %.lr.ph
  tail call void @bbclear(ptr noundef nonnull %.07)
  br label %5

5:                                                ; preds = %4, %.lr.ph
  %.0 = load ptr, ptr %.07, align 8, !tbaa !5
  %.not = icmp eq ptr %.0, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12

._crit_edge:                                      ; preds = %5, %0
  ret void
}

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 = !{!"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,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass