; LLVM IR from filipwasil/fillwave :: ext/nv_helpers_gl/nv_dds.ll (ZN6nv_dds9CDDSImage17flip_blocks_dxtc1EPNS_11DXTColBlockEj)

; 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.nv_dds::DXTColBlock" = type { i16, i16, [4 x i8] }

; 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 uwtable
declare dso_local void @_ZN6nv_dds9CDDSImage4swapEPvS1_j(ptr noundef nonnull align 8 dereferenceable(104), ptr noundef, ptr noundef, i32 noundef) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN6nv_dds9CDDSImage17flip_blocks_dxtc1EPNS_11DXTColBlockEj(ptr noundef nonnull align 8 dereferenceable(104) %0, ptr noundef %1, i32 noundef %2) #1 align 2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  %9 = load ptr, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %10, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %31, %3
  %12 = load i32, ptr %8, align 4, !tbaa !9
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = icmp ult i32 %12, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %34

16:                                               ; preds = %11
  %17 = load ptr, ptr %7, align 8, !tbaa !5
  %18 = getelementptr inbounds %"struct.nv_dds::DXTColBlock", ptr %17, i32 0, i32 2
  %19 = getelementptr inbounds [4 x i8], ptr %18, i64 0, i64 0
  %20 = load ptr, ptr %7, align 8, !tbaa !5
  %21 = getelementptr inbounds %"struct.nv_dds::DXTColBlock", ptr %20, i32 0, i32 2
  %22 = getelementptr inbounds [4 x i8], ptr %21, i64 0, i64 3
  call void @_ZN6nv_dds9CDDSImage4swapEPvS1_j(ptr noundef nonnull align 8 dereferenceable(104) %9, ptr noundef %19, ptr noundef %22, i32 noundef 1)
  %23 = load ptr, ptr %7, align 8, !tbaa !5
  %24 = getelementptr inbounds %"struct.nv_dds::DXTColBlock", ptr %23, i32 0, i32 2
  %25 = getelementptr inbounds [4 x i8], ptr %24, i64 0, i64 1
  %26 = load ptr, ptr %7, align 8, !tbaa !5
  %27 = getelementptr inbounds %"struct.nv_dds::DXTColBlock", ptr %26, i32 0, i32 2
  %28 = getelementptr inbounds [4 x i8], ptr %27, i64 0, i64 2
  call void @_ZN6nv_dds9CDDSImage4swapEPvS1_j(ptr noundef nonnull align 8 dereferenceable(104) %9, ptr noundef %25, ptr noundef %28, i32 noundef 1)
  %29 = load ptr, ptr %7, align 8, !tbaa !5
  %30 = getelementptr inbounds %"struct.nv_dds::DXTColBlock", ptr %29, i32 1
  store ptr %30, ptr %7, align 8, !tbaa !5
  br label %31

31:                                               ; preds = %16
  %32 = load i32, ptr %8, align 4, !tbaa !9
  %33 = add i32 %32, 1
  store i32 %33, ptr %8, align 4, !tbaa !9
  br label %11, !llvm.loop !11

34:                                               ; preds = %15
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  ret void
}

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


; 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 uwtable
declare dso_local void @_ZN6nv_dds9CDDSImage4swapEPvS1_j(ptr noundef nonnull align 8 dereferenceable(104), ptr noundef, ptr noundef, i32 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN6nv_dds9CDDSImage17flip_blocks_dxtc1EPNS_11DXTColBlockEj(ptr noundef nonnull align 8 dereferenceable(104) %0, ptr noundef %1, i32 noundef %2) local_unnamed_addr #0 align 2 {
  %.not = icmp eq i32 %2, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %3
  ret void

.lr.ph:                                           ; preds = %3, %.lr.ph
  %.011 = phi i32 [ %9, %.lr.ph ], [ 0, %3 ]
  %.0910 = phi ptr [ %8, %.lr.ph ], [ %1, %3 ]
  %4 = getelementptr inbounds i8, ptr %.0910, i64 4
  %5 = getelementptr inbounds i8, ptr %.0910, i64 7
  tail call void @_ZN6nv_dds9CDDSImage4swapEPvS1_j(ptr noundef nonnull align 8 dereferenceable(104) %0, ptr noundef nonnull %4, ptr noundef nonnull %5, i32 noundef 1)
  %6 = getelementptr inbounds i8, ptr %.0910, i64 5
  %7 = getelementptr inbounds i8, ptr %.0910, i64 6
  tail call void @_ZN6nv_dds9CDDSImage4swapEPvS1_j(ptr noundef nonnull align 8 dereferenceable(104) %0, ptr noundef nonnull %6, ptr noundef nonnull %7, i32 noundef 1)
  %8 = getelementptr inbounds i8, ptr %.0910, i64 8
  %9 = add nuw i32 %.011, 1
  %exitcond.not = icmp eq i32 %9, %2
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5
}

attributes #0 = { mustprogress 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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