; LLVM IR from Wilson-ZheLin/Introduction-to-Digital-Image-Processing :: 10. Otus, Moving Average, and Region Growing/src/main.ll (Z3sumiPf)

; 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: mustprogress nounwind uwtable
define dso_local noundef float @_Z3sumiPf(i32 noundef %0, ptr noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca float, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store float 0.000000e+00, ptr %5, align 4, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %22, %2
  %8 = load i32, ptr %6, align 4, !tbaa !5
  %9 = load i32, ptr %3, align 4, !tbaa !5
  %10 = icmp slt i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %25

12:                                               ; preds = %7
  %13 = load i32, ptr %6, align 4, !tbaa !5
  %14 = sitofp i32 %13 to float
  %15 = load ptr, ptr %4, align 8, !tbaa !9
  %16 = load i32, ptr %6, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds float, ptr %15, i64 %17
  %19 = load float, ptr %18, align 4, !tbaa !11
  %20 = load float, ptr %5, align 4, !tbaa !11
  %21 = call float @llvm.fmuladd.f32(float %14, float %19, float %20)
  store float %21, ptr %5, align 4, !tbaa !11
  br label %22

22:                                               ; preds = %12
  %23 = load i32, ptr %6, align 4, !tbaa !5
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr %6, align 4, !tbaa !5
  br label %7, !llvm.loop !13

25:                                               ; preds = %11
  %26 = load float, ptr %5, align 4, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret float %26
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare float @llvm.fmuladd.f32(float, float, float) #2

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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #3 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"float", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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 nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef float @_Z3sumiPf(i32 noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = icmp sgt i32 %0, 0
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %0 to i64
  %xtraiter = and i64 %wide.trip.count, 3
  %4 = icmp ult i32 %0, 4
  br i1 %4, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %wide.trip.count, 2147483644
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.lcssa.ph = phi float [ poison, %.lr.ph.preheader ], [ %29, %.lr.ph ]
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next.3, %.lr.ph ]
  %.078.unr = phi float [ 0.000000e+00, %.lr.ph.preheader ], [ %29, %.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
  %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %.lr.ph.epil ], [ %indvars.iv.unr, %._crit_edge.loopexit.unr-lcssa ]
  %.078.epil = phi float [ %9, %.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 ]
  %5 = trunc nuw nsw i64 %indvars.iv.epil to i32
  %6 = uitofp nneg i32 %5 to float
  %7 = getelementptr inbounds float, ptr %1, i64 %indvars.iv.epil
  %8 = load float, ptr %7, align 4, !tbaa !5
  %9 = tail call float @llvm.fmuladd.f32(float %6, float %8, float %.078.epil)
  %indvars.iv.next.epil = add nuw nsw i64 %indvars.iv.epil, 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 !9

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil, %2
  %.07.lcssa = phi float [ 0.000000e+00, %2 ], [ %.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %9, %.lr.ph.epil ]
  ret float %.07.lcssa

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader.new ], [ %indvars.iv.next.3, %.lr.ph ]
  %.078 = phi float [ 0.000000e+00, %.lr.ph.preheader.new ], [ %29, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.3, %.lr.ph ]
  %10 = trunc nuw nsw i64 %indvars.iv to i32
  %11 = uitofp nneg i32 %10 to float
  %12 = getelementptr inbounds float, ptr %1, i64 %indvars.iv
  %13 = load float, ptr %12, align 4, !tbaa !5
  %14 = tail call float @llvm.fmuladd.f32(float %11, float %13, float %.078)
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %15 = trunc nuw nsw i64 %indvars.iv.next to i32
  %16 = uitofp nneg i32 %15 to float
  %17 = getelementptr inbounds float, ptr %1, i64 %indvars.iv.next
  %18 = load float, ptr %17, align 4, !tbaa !5
  %19 = tail call float @llvm.fmuladd.f32(float %16, float %18, float %14)
  %indvars.iv.next.1 = or disjoint i64 %indvars.iv, 2
  %20 = trunc nuw nsw i64 %indvars.iv.next.1 to i32
  %21 = uitofp nneg i32 %20 to float
  %22 = getelementptr inbounds float, ptr %1, i64 %indvars.iv.next.1
  %23 = load float, ptr %22, align 4, !tbaa !5
  %24 = tail call float @llvm.fmuladd.f32(float %21, float %23, float %19)
  %indvars.iv.next.2 = or disjoint i64 %indvars.iv, 3
  %25 = trunc nuw nsw i64 %indvars.iv.next.2 to i32
  %26 = uitofp nneg i32 %25 to float
  %27 = getelementptr inbounds float, ptr %1, i64 %indvars.iv.next.2
  %28 = load float, ptr %27, align 4, !tbaa !5
  %29 = tail call float @llvm.fmuladd.f32(float %26, float %28, float %24)
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 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 !11
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare float @llvm.fmuladd.f32(float, float, float) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) 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 nosync nounwind speculatable willreturn memory(none) }

!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 = !{!"float", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.unroll.disable"}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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