; LLVM IR from zchrissirhcz/pixel :: legacy (rgb2gray)

; 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
define dso_local void @pixel_rgb2gray_fixed2(ptr noundef %0, i64 noundef %1, i64 noundef %2, ptr noundef %3) #1 {
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i64, align 8
  %10 = alloca i64, align 8
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i64 %1, ptr %6, align 8, !tbaa !9
  store i64 %2, ptr %7, align 8, !tbaa !9
  store ptr %3, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  %11 = load i64, ptr %6, align 8, !tbaa !9
  %12 = load i64, ptr %7, align 8, !tbaa !9
  %13 = mul i64 %11, %12
  store i64 %13, ptr %9, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #2
  store i64 0, ptr %10, align 8, !tbaa !9
  br label %14

14:                                               ; preds = %44, %4
  %15 = load i64, ptr %10, align 8, !tbaa !9
  %16 = load i64, ptr %9, align 8, !tbaa !9
  %17 = icmp ult i64 %15, %16
  br i1 %17, label %19, label %18

18:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #2
  br label %47

19:                                               ; preds = %14
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = getelementptr inbounds i8, ptr %20, i64 0
  %22 = load i8, ptr %21, align 1, !tbaa !11
  %23 = zext i8 %22 to i32
  %24 = mul nsw i32 77, %23
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = getelementptr inbounds i8, ptr %25, i64 1
  %27 = load i8, ptr %26, align 1, !tbaa !11
  %28 = zext i8 %27 to i32
  %29 = mul nsw i32 150, %28
  %30 = add nsw i32 %24, %29
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = getelementptr inbounds i8, ptr %31, i64 2
  %33 = load i8, ptr %32, align 1, !tbaa !11
  %34 = zext i8 %33 to i32
  %35 = mul nsw i32 29, %34
  %36 = add nsw i32 %30, %35
  %37 = ashr i32 %36, 8
  %38 = trunc i32 %37 to i8
  %39 = load ptr, ptr %8, align 8, !tbaa !5
  store i8 %38, ptr %39, align 1, !tbaa !11
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  %41 = getelementptr inbounds i8, ptr %40, i64 3
  store ptr %41, ptr %5, align 8, !tbaa !5
  %42 = load ptr, ptr %8, align 8, !tbaa !5
  %43 = getelementptr inbounds i8, ptr %42, i32 1
  store ptr %43, ptr %8, align 8, !tbaa !5
  br label %44

44:                                               ; preds = %19
  %45 = load i64, ptr %10, align 8, !tbaa !9
  %46 = add i64 %45, 1
  store i64 %46, ptr %10, align 8, !tbaa !9
  br label %14, !llvm.loop !12

47:                                               ; preds = %18
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #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 = !{!"long", !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: nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @pixel_rgb2gray_fixed2(ptr nocapture noundef readonly %0, i64 noundef %1, i64 noundef %2, ptr nocapture noundef writeonly %3) local_unnamed_addr #0 {
  %5 = mul i64 %2, %1
  %.not = icmp eq i64 %5, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %4
  %xtraiter = and i64 %5, 1
  %6 = icmp eq i64 %5, 1
  br i1 %6, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %5, -2
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.01013.unr = phi ptr [ %0, %.lr.ph.preheader ], [ %54, %.lr.ph ]
  %.01112.unr = phi ptr [ %3, %.lr.ph.preheader ], [ %55, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa
  %7 = load i8, ptr %.01013.unr, align 1, !tbaa !5
  %8 = zext i8 %7 to i32
  %9 = mul nuw nsw i32 %8, 77
  %10 = getelementptr inbounds i8, ptr %.01013.unr, i64 1
  %11 = load i8, ptr %10, align 1, !tbaa !5
  %12 = zext i8 %11 to i32
  %13 = mul nuw nsw i32 %12, 150
  %14 = add nuw nsw i32 %13, %9
  %15 = getelementptr inbounds i8, ptr %.01013.unr, i64 2
  %16 = load i8, ptr %15, align 1, !tbaa !5
  %17 = zext i8 %16 to i32
  %18 = mul nuw nsw i32 %17, 29
  %19 = add nuw nsw i32 %14, %18
  %20 = lshr i32 %19, 8
  %21 = trunc nuw i32 %20 to i8
  store i8 %21, ptr %.01112.unr, align 1, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph.epil, %._crit_edge.loopexit.unr-lcssa, %4
  ret void

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %.01013 = phi ptr [ %0, %.lr.ph.preheader.new ], [ %54, %.lr.ph ]
  %.01112 = phi ptr [ %3, %.lr.ph.preheader.new ], [ %55, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %22 = load i8, ptr %.01013, align 1, !tbaa !5
  %23 = zext i8 %22 to i32
  %24 = mul nuw nsw i32 %23, 77
  %25 = getelementptr inbounds i8, ptr %.01013, i64 1
  %26 = load i8, ptr %25, align 1, !tbaa !5
  %27 = zext i8 %26 to i32
  %28 = mul nuw nsw i32 %27, 150
  %29 = add nuw nsw i32 %28, %24
  %30 = getelementptr inbounds i8, ptr %.01013, i64 2
  %31 = load i8, ptr %30, align 1, !tbaa !5
  %32 = zext i8 %31 to i32
  %33 = mul nuw nsw i32 %32, 29
  %34 = add nuw nsw i32 %29, %33
  %35 = lshr i32 %34, 8
  %36 = trunc nuw i32 %35 to i8
  store i8 %36, ptr %.01112, align 1, !tbaa !5
  %37 = getelementptr inbounds i8, ptr %.01013, i64 3
  %38 = getelementptr inbounds i8, ptr %.01112, i64 1
  %39 = load i8, ptr %37, align 1, !tbaa !5
  %40 = zext i8 %39 to i32
  %41 = mul nuw nsw i32 %40, 77
  %42 = getelementptr inbounds i8, ptr %.01013, i64 4
  %43 = load i8, ptr %42, align 1, !tbaa !5
  %44 = zext i8 %43 to i32
  %45 = mul nuw nsw i32 %44, 150
  %46 = add nuw nsw i32 %45, %41
  %47 = getelementptr inbounds i8, ptr %.01013, i64 5
  %48 = load i8, ptr %47, align 1, !tbaa !5
  %49 = zext i8 %48 to i32
  %50 = mul nuw nsw i32 %49, 29
  %51 = add nuw nsw i32 %46, %50
  %52 = lshr i32 %51, 8
  %53 = trunc nuw i32 %52 to i8
  store i8 %53, ptr %38, align 1, !tbaa !5
  %54 = getelementptr inbounds i8, ptr %.01013, i64 6
  %55 = getelementptr inbounds i8, ptr %.01112, i64 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !8
}

attributes #0 = { nofree norecurse nosync nounwind 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" }

!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 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass