; LLVM IR from nickmqb/muon :: bootstrap/mu.ll_string (join__)

; 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.string__ = type { ptr, i32 }
%struct.tag_____StringBuilder__ = type { ptr, i32, i32 }
%struct.tag_____Array__string____ = type { ptr, i32 }

; 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: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

; Function Attrs: nounwind uwtable
declare dso_local void @StringBuilder__write__(ptr noundef, ptr, i32) #3

; Function Attrs: nounwind uwtable
declare dso_local { ptr, i32 } @StringBuilder__compactToString__(ptr noundef) #3

; Function Attrs: nounwind uwtable
define dso_local { ptr, i32 } @string__join__(ptr %0, i32 %1, ptr noundef %2) #3 {
  %4 = alloca %struct.string__, align 8
  %5 = alloca %struct.string__, align 8
  %6 = alloca ptr, align 8
  %7 = alloca %struct.tag_____StringBuilder__, align 8
  %8 = alloca %struct.tag_____StringBuilder__, align 8
  %9 = alloca i8, align 1
  %10 = alloca ptr, align 8
  %11 = alloca i32, align 4
  %12 = alloca %struct.string__, align 8
  %13 = getelementptr inbounds { ptr, i32 }, ptr %5, i32 0, i32 0
  store ptr %0, ptr %13, align 8
  %14 = getelementptr inbounds { ptr, i32 }, ptr %5, i32 0, i32 1
  store i32 %1, ptr %14, align 8
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 16, ptr %7) #4
  call void @llvm.memset.p0.i64(ptr align 8 %7, i8 0, i64 16, i1 false)
  call void @llvm.lifetime.start.p0(i64 16, ptr %8) #4
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %8, ptr align 8 %7, i64 16, i1 false), !tbaa.struct !9
  call void @llvm.lifetime.start.p0(i64 1, ptr %9) #4
  store i8 0, ptr %9, align 1, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #4
  %15 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %15, ptr %10, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #4
  store i32 0, ptr %11, align 4, !tbaa !10
  br label %16

16:                                               ; preds = %37, %3
  %17 = load i32, ptr %11, align 4, !tbaa !10
  %18 = load ptr, ptr %10, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.tag_____Array__string____, ptr %18, i32 0, i32 1
  %20 = load i32, ptr %19, align 8, !tbaa !13
  %21 = icmp slt i32 %17, %20
  br i1 %21, label %22, label %44

22:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 16, ptr %12) #4
  %23 = load ptr, ptr %10, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.tag_____Array__string____, ptr %23, i32 0, i32 0
  %25 = load ptr, ptr %24, align 8, !tbaa !15
  %26 = load i32, ptr %11, align 4, !tbaa !10
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds %struct.string__, ptr %25, i64 %27
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %12, ptr align 8 %28, i64 16, i1 false), !tbaa.struct !16
  %29 = load i8, ptr %9, align 1, !tbaa !12
  %30 = icmp ne i8 %29, 0
  br i1 %30, label %31, label %36

31:                                               ; preds = %22
  %32 = getelementptr inbounds { ptr, i32 }, ptr %5, i32 0, i32 0
  %33 = load ptr, ptr %32, align 8
  %34 = getelementptr inbounds { ptr, i32 }, ptr %5, i32 0, i32 1
  %35 = load i32, ptr %34, align 8
  call void @StringBuilder__write__(ptr noundef %8, ptr %33, i32 %35)
  br label %37

36:                                               ; preds = %22
  store i8 1, ptr %9, align 1, !tbaa !12
  br label %37

37:                                               ; preds = %36, %31
  %38 = getelementptr inbounds { ptr, i32 }, ptr %12, i32 0, i32 0
  %39 = load ptr, ptr %38, align 8
  %40 = getelementptr inbounds { ptr, i32 }, ptr %12, i32 0, i32 1
  %41 = load i32, ptr %40, align 8
  call void @StringBuilder__write__(ptr noundef %8, ptr %39, i32 %41)
  %42 = load i32, ptr %11, align 4, !tbaa !10
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %11, align 4, !tbaa !10
  call void @llvm.lifetime.end.p0(i64 16, ptr %12) #4
  br label %16, !llvm.loop !17

44:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #4
  %45 = call { ptr, i32 } @StringBuilder__compactToString__(ptr noundef %8)
  %46 = getelementptr inbounds { ptr, i32 }, ptr %4, i32 0, i32 0
  %47 = extractvalue { ptr, i32 } %45, 0
  store ptr %47, ptr %46, align 8
  %48 = getelementptr inbounds { ptr, i32 }, ptr %4, i32 0, i32 1
  %49 = extractvalue { ptr, i32 } %45, 1
  store i32 %49, ptr %48, align 8
  call void @llvm.lifetime.end.p0(i64 1, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr %7) #4
  %50 = load { ptr, i32 }, ptr %4, align 8
  ret { ptr, i32 } %50
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #2 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 #4 = { 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 = !{i64 0, i64 8, !5, i64 8, i64 4, !10, i64 12, i64 4, !10}
!10 = !{!11, !11, i64 0}
!11 = !{!"int", !7, i64 0}
!12 = !{!7, !7, i64 0}
!13 = !{!14, !11, i64 8}
!14 = !{!"tag_____Array__string____", !6, i64 0, !11, i64 8}
!15 = !{!14, !6, i64 0}
!16 = !{i64 0, i64 8, !5, i64 8, i64 4, !10}
!17 = distinct !{!17, !18}
!18 = !{!"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.tag_____StringBuilder__ = type { ptr, i32, i32 }
%struct.string__ = type { ptr, i32 }

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

; Function Attrs: nounwind uwtable
declare dso_local void @StringBuilder__write__(ptr noundef, ptr, i32) local_unnamed_addr #2

; Function Attrs: nounwind uwtable
declare dso_local { ptr, i32 } @StringBuilder__compactToString__(ptr noundef) local_unnamed_addr #2

; Function Attrs: nounwind uwtable
define dso_local { ptr, i32 } @string__join__(ptr %0, i32 %1, ptr nocapture noundef readonly %2) local_unnamed_addr #2 {
  %4 = alloca %struct.tag_____StringBuilder__, align 8
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %4) #3
  call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %4, i8 0, i64 16, i1 false)
  %5 = getelementptr inbounds i8, ptr %2, i64 8
  %6 = load i32, ptr %5, align 8, !tbaa !5
  %7 = icmp sgt i32 %6, 0
  br i1 %7, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %3
  %8 = load ptr, ptr %2, align 8, !tbaa !11
  %.sroa.4.0..sroa_idx.peel = getelementptr inbounds i8, ptr %8, i64 8
  %.sroa.4.0.copyload.peel = load i32, ptr %.sroa.4.0..sroa_idx.peel, align 8, !tbaa !12
  %.sroa.0.0.copyload.peel = load ptr, ptr %8, align 8, !tbaa !13
  call void @StringBuilder__write__(ptr noundef nonnull %4, ptr %.sroa.0.0.copyload.peel, i32 %.sroa.4.0.copyload.peel)
  %9 = load i32, ptr %5, align 8, !tbaa !5
  %10 = icmp sgt i32 %9, 1
  br i1 %10, label %.lr.ph.peel.next, label %._crit_edge

.lr.ph.peel.next:                                 ; preds = %.lr.ph.preheader, %.lr.ph.peel.next
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph.peel.next ], [ 1, %.lr.ph.preheader ]
  %11 = load ptr, ptr %2, align 8, !tbaa !11
  %12 = getelementptr inbounds %struct.string__, ptr %11, i64 %indvars.iv
  %.sroa.0.0.copyload = load ptr, ptr %12, align 8, !tbaa !13
  %.sroa.4.0..sroa_idx = getelementptr inbounds i8, ptr %12, i64 8
  %.sroa.4.0.copyload = load i32, ptr %.sroa.4.0..sroa_idx, align 8, !tbaa !12
  call void @StringBuilder__write__(ptr noundef nonnull %4, ptr %0, i32 %1)
  call void @StringBuilder__write__(ptr noundef nonnull %4, ptr %.sroa.0.0.copyload, i32 %.sroa.4.0.copyload)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %13 = load i32, ptr %5, align 8, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = icmp slt i64 %indvars.iv.next, %14
  br i1 %15, label %.lr.ph.peel.next, label %._crit_edge, !llvm.loop !14

._crit_edge:                                      ; preds = %.lr.ph.peel.next, %.lr.ph.preheader, %3
  %16 = call { ptr, i32 } @StringBuilder__compactToString__(ptr noundef nonnull %4)
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %4) #3
  ret { ptr, i32 } %16
}

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #2 = { 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 #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, !10, i64 8}
!6 = !{!"tag_____Array__string____", !7, i64 0, !10, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = !{!10, !10, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15, !16}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!"llvm.loop.peeled.count", i32 1}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopFullUnrollPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,MemCpyOptPass,PostOrderFunctionAttrsPass,SCCPPass,SROAPass,SimplifyCFGPass