; LLVM IR from freakout42/macrocalc :: mc/nro (nrotxt)

; 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: nounwind uwtable
declare dso_local i32 @width(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @justcntr(ptr noundef %0, ptr noundef %1, ptr noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = call i32 @width(ptr noundef %8)
  store i32 %9, ptr %7, align 4, !tbaa !9
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = load ptr, ptr %6, align 8, !tbaa !5
  %12 = getelementptr inbounds i32, ptr %11, i64 1
  %13 = load i32, ptr %12, align 4, !tbaa !9
  %14 = load ptr, ptr %6, align 8, !tbaa !5
  %15 = getelementptr inbounds i32, ptr %14, i64 0
  %16 = load i32, ptr %15, align 4, !tbaa !9
  %17 = add nsw i32 %13, %16
  %18 = load i32, ptr %7, align 4, !tbaa !9
  %19 = sub nsw i32 %17, %18
  %20 = ashr i32 %19, 1
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds i8, ptr %10, i64 %21
  store ptr %22, ptr %5, align 8, !tbaa !5
  br label %23

23:                                               ; preds = %28, %3
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = load i8, ptr %24, align 1, !tbaa !11
  %26 = sext i8 %25 to i32
  %27 = icmp ne i32 %26, 0
  br i1 %27, label %28, label %34

28:                                               ; preds = %23
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = getelementptr inbounds i8, ptr %29, i32 1
  store ptr %30, ptr %4, align 8, !tbaa !5
  %31 = load i8, ptr %29, align 1, !tbaa !11
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = getelementptr inbounds i8, ptr %32, i32 1
  store ptr %33, ptr %5, align 8, !tbaa !5
  store i8 %31, ptr %32, align 1, !tbaa !11
  br label %23, !llvm.loop !12

34:                                               ; preds = %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret void
}

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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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"

; Function Attrs: nounwind uwtable
declare dso_local i32 @width(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @justcntr(ptr noundef %0, ptr nocapture noundef writeonly %1, ptr nocapture noundef readonly %2) local_unnamed_addr #0 {
  %4 = tail call i32 @width(ptr noundef %0)
  %5 = load i8, ptr %0, align 1, !tbaa !5
  %.not8 = icmp eq i8 %5, 0
  br i1 %.not8, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %6 = getelementptr inbounds i8, ptr %2, i64 4
  %7 = load i32, ptr %6, align 4, !tbaa !8
  %8 = sub i32 %7, %4
  %9 = load i32, ptr %2, align 4, !tbaa !8
  %10 = add i32 %8, %9
  %11 = ashr i32 %10, 1
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds i8, ptr %1, i64 %12
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %14 = phi i8 [ %17, %.lr.ph ], [ %5, %.lr.ph.preheader ]
  %.010 = phi ptr [ %15, %.lr.ph ], [ %0, %.lr.ph.preheader ]
  %.079 = phi ptr [ %16, %.lr.ph ], [ %13, %.lr.ph.preheader ]
  %15 = getelementptr inbounds i8, ptr %.010, i64 1
  %16 = getelementptr inbounds i8, ptr %.079, i64 1
  store i8 %14, ptr %.079, align 1, !tbaa !5
  %17 = load i8, ptr %15, align 1, !tbaa !5
  %.not = icmp eq i8 %17, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !10

._crit_edge:                                      ; preds = %.lr.ph, %3
  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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !6, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


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