; LLVM IR from zchrissirhcz/pixel :: perfs/histogram (histogram)

; 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: nounwind uwtable
define dso_local void @histogram_gray_naive(ptr noundef %0, i64 noundef %1, i64 noundef %2, ptr noundef %3) #0 {
  %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 = %29, %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 %32

19:                                               ; preds = %14
  %20 = load ptr, ptr %8, align 8, !tbaa !5
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = load i8, ptr %21, align 1, !tbaa !11
  %23 = zext i8 %22 to i64
  %24 = getelementptr inbounds i32, ptr %20, i64 %23
  %25 = load i32, ptr %24, align 4, !tbaa !12
  %26 = add i32 %25, 1
  store i32 %26, ptr %24, align 4, !tbaa !12
  %27 = load ptr, ptr %5, align 8, !tbaa !5
  %28 = getelementptr inbounds i8, ptr %27, i32 1
  store ptr %28, ptr %5, align 8, !tbaa !5
  br label %29

29:                                               ; preds = %19
  %30 = load i64, ptr %10, align 8, !tbaa !9
  %31 = add i64 %30, 1
  store i64 %31, ptr %10, align 8, !tbaa !9
  br label %14, !llvm.loop !14

32:                                               ; preds = %18
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!13, !13, i64 0}
!13 = !{!"int", !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local void @histogram_gray_naive(ptr nocapture noundef readonly %0, i64 noundef %1, i64 noundef %2, ptr nocapture noundef %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, 3
  %6 = icmp ult i64 %5, 4
  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, -4
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.078.unr = phi ptr [ %0, %.lr.ph.preheader ], [ %36, %.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, %.lr.ph.epil
  %.078.epil = phi ptr [ %12, %.lr.ph.epil ], [ %.078.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %7 = load i8, ptr %.078.epil, align 1, !tbaa !5
  %8 = zext i8 %7 to i64
  %9 = getelementptr inbounds i32, ptr %3, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !8
  %11 = add i32 %10, 1
  store i32 %11, ptr %9, align 4, !tbaa !8
  %12 = getelementptr inbounds i8, ptr %.078.epil, i64 1
  %epil.iter.next = add i64 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i64 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge, label %.lr.ph.epil, !llvm.loop !10

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

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %.078 = phi ptr [ %0, %.lr.ph.preheader.new ], [ %36, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.3, %.lr.ph ]
  %13 = load i8, ptr %.078, align 1, !tbaa !5
  %14 = zext i8 %13 to i64
  %15 = getelementptr inbounds i32, ptr %3, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !8
  %17 = add i32 %16, 1
  store i32 %17, ptr %15, align 4, !tbaa !8
  %18 = getelementptr inbounds i8, ptr %.078, i64 1
  %19 = load i8, ptr %18, align 1, !tbaa !5
  %20 = zext i8 %19 to i64
  %21 = getelementptr inbounds i32, ptr %3, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !8
  %23 = add i32 %22, 1
  store i32 %23, ptr %21, align 4, !tbaa !8
  %24 = getelementptr inbounds i8, ptr %.078, i64 2
  %25 = load i8, ptr %24, align 1, !tbaa !5
  %26 = zext i8 %25 to i64
  %27 = getelementptr inbounds i32, ptr %3, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !8
  %29 = add i32 %28, 1
  store i32 %29, ptr %27, align 4, !tbaa !8
  %30 = getelementptr inbounds i8, ptr %.078, i64 3
  %31 = load i8, ptr %30, align 1, !tbaa !5
  %32 = zext i8 %31 to i64
  %33 = getelementptr inbounds i32, ptr %3, i64 %32
  %34 = load i32, ptr %33, align 4, !tbaa !8
  %35 = add i32 %34, 1
  store i32 %35, ptr %33, align 4, !tbaa !8
  %36 = getelementptr inbounds i8, ptr %.078, i64 4
  %niter.next.3 = add i64 %niter, 4
  %niter.ncmp.3 = icmp eq i64 %niter.next.3, %unroll_iter
  br i1 %niter.ncmp.3, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !12
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, argmem: 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 = !{!9, !9, i64 0}
!9 = !{!"int", !6, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.unroll.disable"}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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