; LLVM IR from steps3d/graphics-book :: Code/Core/Data.ll (ZN4Data8getBytesEPvi)

; 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"

%class.Data = type { ptr, ptr, i32, i32 }

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_ZN4Data8getBytesEPvi(ptr noundef nonnull align 8 dereferenceable(24) %0, ptr noundef %1, i32 noundef %2) #0 align 2 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  %8 = load ptr, ptr %5, align 8
  %9 = getelementptr inbounds %class.Data, ptr %8, i32 0, i32 3
  %10 = load i32, ptr %9, align 4, !tbaa !11
  %11 = getelementptr inbounds %class.Data, ptr %8, i32 0, i32 2
  %12 = load i32, ptr %11, align 8, !tbaa !13
  %13 = icmp sge i32 %10, %12
  br i1 %13, label %14, label %15

14:                                               ; preds = %3
  store i32 -1, ptr %4, align 4
  br label %44

15:                                               ; preds = %3
  %16 = getelementptr inbounds %class.Data, ptr %8, i32 0, i32 3
  %17 = load i32, ptr %16, align 4, !tbaa !11
  %18 = load i32, ptr %7, align 4, !tbaa !9
  %19 = add nsw i32 %17, %18
  %20 = getelementptr inbounds %class.Data, ptr %8, i32 0, i32 2
  %21 = load i32, ptr %20, align 8, !tbaa !13
  %22 = icmp sgt i32 %19, %21
  br i1 %22, label %23, label %29

23:                                               ; preds = %15
  %24 = getelementptr inbounds %class.Data, ptr %8, i32 0, i32 2
  %25 = load i32, ptr %24, align 8, !tbaa !13
  %26 = getelementptr inbounds %class.Data, ptr %8, i32 0, i32 3
  %27 = load i32, ptr %26, align 4, !tbaa !11
  %28 = sub nsw i32 %25, %27
  store i32 %28, ptr %7, align 4, !tbaa !9
  br label %29

29:                                               ; preds = %23, %15
  %30 = load ptr, ptr %6, align 8, !tbaa !5
  %31 = getelementptr inbounds %class.Data, ptr %8, i32 0, i32 1
  %32 = load ptr, ptr %31, align 8, !tbaa !14
  %33 = getelementptr inbounds %class.Data, ptr %8, i32 0, i32 3
  %34 = load i32, ptr %33, align 4, !tbaa !11
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds i8, ptr %32, i64 %35
  %37 = load i32, ptr %7, align 4, !tbaa !9
  %38 = sext i32 %37 to i64
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %30, ptr align 1 %36, i64 %38, i1 false)
  %39 = load i32, ptr %7, align 4, !tbaa !9
  %40 = getelementptr inbounds %class.Data, ptr %8, i32 0, i32 3
  %41 = load i32, ptr %40, align 4, !tbaa !11
  %42 = add nsw i32 %41, %39
  store i32 %42, ptr %40, align 4, !tbaa !11
  %43 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %43, ptr %4, align 4
  br label %44

44:                                               ; preds = %29, %14
  %45 = load i32, ptr %4, align 4
  ret i32 %45
}

; 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) #1

attributes #0 = { 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 #1 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }

!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 = !{!12, !10, i64 20}
!12 = !{!"_ZTS4Data", !6, i64 0, !6, i64 8, !10, i64 16, !10, i64 20}
!13 = !{!12, !10, i64 16}
!14 = !{!12, !6, i64 8}


; 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(readwrite, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_ZN4Data8getBytesEPvi(ptr nocapture noundef nonnull align 8 dereferenceable(24) %0, ptr nocapture noundef writeonly %1, i32 noundef %2) local_unnamed_addr #0 align 2 {
  %4 = getelementptr inbounds i8, ptr %0, i64 20
  %5 = load i32, ptr %4, align 4, !tbaa !5
  %6 = getelementptr inbounds i8, ptr %0, i64 16
  %7 = load i32, ptr %6, align 8, !tbaa !11
  %.not = icmp slt i32 %5, %7
  br i1 %.not, label %8, label %19

8:                                                ; preds = %3
  %9 = add nsw i32 %5, %2
  %10 = icmp sgt i32 %9, %7
  %11 = sub nsw i32 %7, %5
  %spec.select = select i1 %10, i32 %11, i32 %2
  %12 = getelementptr inbounds i8, ptr %0, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !12
  %14 = sext i32 %5 to i64
  %15 = getelementptr inbounds i8, ptr %13, i64 %14
  %16 = sext i32 %spec.select to i64
  tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 %1, ptr align 1 %15, i64 %16, i1 false)
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = add nsw i32 %17, %spec.select
  store i32 %18, ptr %4, align 4, !tbaa !5
  br label %19

19:                                               ; preds = %3, %8
  %.06 = phi i32 [ %spec.select, %8 ], [ -1, %3 ]
  ret i32 %.06
}

; Function Attrs: mustprogress 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) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, 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" }
attributes #1 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }

!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 20}
!6 = !{!"_ZTS4Data", !7, i64 0, !7, i64 8, !10, i64 16, !10, i64 20}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !10, i64 16}
!12 = !{!6, !7, i64 8}


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