; LLVM IR from simbody/simbody :: Simbody/Visualizer/simbody-visualizer (lodepng)

; 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.LodePNG_UnknownChunks = type { [3 x ptr], [3 x i64] }

; 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: mustprogress nounwind uwtable
define dso_local void @_Z26LodePNG_UnknownChunks_initP21LodePNG_UnknownChunks(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %4

4:                                                ; preds = %13, %1
  %5 = load i32, ptr %3, align 4, !tbaa !9
  %6 = icmp ult i32 %5, 3
  br i1 %6, label %7, label %16

7:                                                ; preds = %4
  %8 = load ptr, ptr %2, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.LodePNG_UnknownChunks, ptr %8, i32 0, i32 0
  %10 = load i32, ptr %3, align 4, !tbaa !9
  %11 = zext i32 %10 to i64
  %12 = getelementptr inbounds [3 x ptr], ptr %9, i64 0, i64 %11
  store ptr null, ptr %12, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %7
  %14 = load i32, ptr %3, align 4, !tbaa !9
  %15 = add i32 %14, 1
  store i32 %15, ptr %3, align 4, !tbaa !9
  br label %4, !llvm.loop !11

16:                                               ; preds = %4
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %26, %16
  %18 = load i32, ptr %3, align 4, !tbaa !9
  %19 = icmp ult i32 %18, 3
  br i1 %19, label %20, label %29

20:                                               ; preds = %17
  %21 = load ptr, ptr %2, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.LodePNG_UnknownChunks, ptr %21, i32 0, i32 1
  %23 = load i32, ptr %3, align 4, !tbaa !9
  %24 = zext i32 %23 to i64
  %25 = getelementptr inbounds [3 x i64], ptr %22, i64 0, i64 %24
  store i64 0, ptr %25, align 8, !tbaa !13
  br label %26

26:                                               ; preds = %20
  %27 = load i32, ptr %3, align 4, !tbaa !9
  %28 = add i32 %27, 1
  store i32 %28, ptr %3, align 4, !tbaa !9
  br label %17, !llvm.loop !15

29:                                               ; preds = %17
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!14, !14, i64 0}
!14 = !{!"long", !7, i64 0}
!15 = distinct !{!15, !12}


; 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: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write) uwtable
define dso_local void @_Z26LodePNG_UnknownChunks_initP21LodePNG_UnknownChunks(ptr nocapture noundef writeonly %0) local_unnamed_addr #0 {
.preheader:
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(48) %0, i8 0, i64 48, i1 false)
  ret void
}

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

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write) 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 nounwind willreturn memory(argmem: write) }

!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)"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LICMPass,LoopIdiomRecognizePass,LoopRotatePass,LoopSimplifyPass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass