; LLVM IR from AllenDowney/ExercisesInC :: exercises/ex08 (matrix2)

; 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.Matrix = type { i32, i32, ptr }

; 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 @reduce_matrix_rows(ptr noundef %0, i32 noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca double, align 8
  %10 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.Matrix, ptr %11, i32 0, i32 2
  %13 = load ptr, ptr %12, align 8, !tbaa !11
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds ptr, ptr %13, i64 %15
  %17 = load ptr, ptr %16, align 8, !tbaa !5
  store ptr %17, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.Matrix, ptr %18, i32 0, i32 2
  %20 = load ptr, ptr %19, align 8, !tbaa !11
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds ptr, ptr %20, i64 %22
  %24 = load ptr, ptr %23, align 8, !tbaa !5
  store ptr %24, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  %25 = load ptr, ptr %7, align 8, !tbaa !5
  %26 = getelementptr inbounds double, ptr %25, i64 0
  %27 = load double, ptr %26, align 8, !tbaa !13
  %28 = load ptr, ptr %8, align 8, !tbaa !5
  %29 = getelementptr inbounds double, ptr %28, i64 0
  %30 = load double, ptr %29, align 8, !tbaa !13
  %31 = fdiv double %27, %30
  store double %31, ptr %9, align 8, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  store i32 0, ptr %10, align 4, !tbaa !9
  br label %32

32:                                               ; preds = %53, %3
  %33 = load i32, ptr %10, align 4, !tbaa !9
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.Matrix, ptr %34, i32 0, i32 1
  %36 = load i32, ptr %35, align 4, !tbaa !15
  %37 = icmp slt i32 %33, %36
  br i1 %37, label %39, label %38

38:                                               ; preds = %32
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  br label %56

39:                                               ; preds = %32
  %40 = load ptr, ptr %8, align 8, !tbaa !5
  %41 = load i32, ptr %10, align 4, !tbaa !9
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds double, ptr %40, i64 %42
  %44 = load double, ptr %43, align 8, !tbaa !13
  %45 = load double, ptr %9, align 8, !tbaa !13
  %46 = load ptr, ptr %7, align 8, !tbaa !5
  %47 = load i32, ptr %10, align 4, !tbaa !9
  %48 = sext i32 %47 to i64
  %49 = getelementptr inbounds double, ptr %46, i64 %48
  %50 = load double, ptr %49, align 8, !tbaa !13
  %51 = fneg double %44
  %52 = call double @llvm.fmuladd.f64(double %51, double %45, double %50)
  store double %52, ptr %49, align 8, !tbaa !13
  br label %53

53:                                               ; preds = %39
  %54 = load i32, ptr %10, align 4, !tbaa !9
  %55 = add nsw i32 %54, 1
  store i32 %55, ptr %10, align 4, !tbaa !9
  br label %32, !llvm.loop !16

56:                                               ; preds = %38
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fmuladd.f64(double, double, double) #2

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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 8}
!12 = !{!"", !10, i64 0, !10, i64 4, !6, i64 8}
!13 = !{!14, !14, i64 0}
!14 = !{!"double", !7, i64 0}
!15 = !{!12, !10, i64 4}
!16 = distinct !{!16, !17}
!17 = !{!"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 @reduce_matrix_rows(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %6 = sext i32 %1 to i64
  %7 = getelementptr inbounds ptr, ptr %5, i64 %6
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  %9 = sext i32 %2 to i64
  %10 = getelementptr inbounds ptr, ptr %5, i64 %9
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  %12 = load double, ptr %8, align 8, !tbaa !12
  %13 = load double, ptr %11, align 8, !tbaa !12
  %14 = fdiv double %12, %13
  %15 = getelementptr inbounds i8, ptr %0, i64 4
  %16 = load i32, ptr %15, align 4, !tbaa !14
  %17 = icmp sgt i32 %16, 0
  br i1 %17, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %3
  %wide.trip.count = zext nneg i32 %16 to i64
  %min.iters.check = icmp ult i32 %16, 4
  br i1 %min.iters.check, label %.lr.ph.preheader19, label %vector.memcheck

.lr.ph.preheader19:                               ; preds = %middle.block, %vector.memcheck, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %vector.memcheck ], [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %xtraiter = and i64 %wide.trip.count, 1
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader19
  %18 = getelementptr inbounds double, ptr %11, i64 %indvars.iv.ph
  %19 = load double, ptr %18, align 8, !tbaa !12
  %20 = getelementptr inbounds double, ptr %8, i64 %indvars.iv.ph
  %21 = load double, ptr %20, align 8, !tbaa !12
  %22 = fneg double %19
  %23 = tail call double @llvm.fmuladd.f64(double %22, double %14, double %21)
  store double %23, ptr %20, align 8, !tbaa !12
  %indvars.iv.next.prol = or disjoint i64 %indvars.iv.ph, 1
  br label %.lr.ph.prol.loopexit

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader19
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.lr.ph.preheader19 ], [ %indvars.iv.next.prol, %.lr.ph.prol ]
  %24 = add nsw i64 %wide.trip.count, -1
  %25 = icmp eq i64 %indvars.iv.ph, %24
  br i1 %25, label %._crit_edge, label %.lr.ph

vector.memcheck:                                  ; preds = %.lr.ph.preheader
  %26 = shl nuw nsw i64 %wide.trip.count, 3
  %scevgep = getelementptr i8, ptr %8, i64 %26
  %scevgep15 = getelementptr i8, ptr %11, i64 %26
  %bound0 = icmp ult ptr %8, %scevgep15
  %bound1 = icmp ult ptr %11, %scevgep
  %found.conflict = and i1 %bound0, %bound1
  br i1 %found.conflict, label %.lr.ph.preheader19, label %vector.ph

vector.ph:                                        ; preds = %vector.memcheck
  %n.vec = and i64 %wide.trip.count, 2147483644
  %broadcast.splatinsert = insertelement <2 x double> poison, double %14, i64 0
  %broadcast.splat = shufflevector <2 x double> %broadcast.splatinsert, <2 x double> poison, <2 x i32> zeroinitializer
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %27 = getelementptr inbounds double, ptr %11, i64 %index
  %28 = getelementptr inbounds i8, ptr %27, i64 16
  %wide.load = load <2 x double>, ptr %27, align 8, !tbaa !12, !alias.scope !15
  %wide.load16 = load <2 x double>, ptr %28, align 8, !tbaa !12, !alias.scope !15
  %29 = getelementptr inbounds double, ptr %8, i64 %index
  %30 = getelementptr inbounds i8, ptr %29, i64 16
  %wide.load17 = load <2 x double>, ptr %29, align 8, !tbaa !12, !alias.scope !18, !noalias !15
  %wide.load18 = load <2 x double>, ptr %30, align 8, !tbaa !12, !alias.scope !18, !noalias !15
  %31 = fneg <2 x double> %wide.load
  %32 = fneg <2 x double> %wide.load16
  %33 = tail call <2 x double> @llvm.fmuladd.v2f64(<2 x double> %31, <2 x double> %broadcast.splat, <2 x double> %wide.load17)
  %34 = tail call <2 x double> @llvm.fmuladd.v2f64(<2 x double> %32, <2 x double> %broadcast.splat, <2 x double> %wide.load18)
  store <2 x double> %33, ptr %29, align 8, !tbaa !12, !alias.scope !18, !noalias !15
  store <2 x double> %34, ptr %30, align 8, !tbaa !12, !alias.scope !18, !noalias !15
  %index.next = add nuw i64 %index, 4
  %35 = icmp eq i64 %index.next, %n.vec
  br i1 %35, label %middle.block, label %vector.body, !llvm.loop !20

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader19

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %middle.block, %3
  ret void

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next.1, %.lr.ph ], [ %indvars.iv.unr, %.lr.ph.prol.loopexit ]
  %36 = getelementptr inbounds double, ptr %11, i64 %indvars.iv
  %37 = load double, ptr %36, align 8, !tbaa !12
  %38 = getelementptr inbounds double, ptr %8, i64 %indvars.iv
  %39 = load double, ptr %38, align 8, !tbaa !12
  %40 = fneg double %37
  %41 = tail call double @llvm.fmuladd.f64(double %40, double %14, double %39)
  store double %41, ptr %38, align 8, !tbaa !12
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %42 = getelementptr inbounds double, ptr %11, i64 %indvars.iv.next
  %43 = load double, ptr %42, align 8, !tbaa !12
  %44 = getelementptr inbounds double, ptr %8, i64 %indvars.iv.next
  %45 = load double, ptr %44, align 8, !tbaa !12
  %46 = fneg double %43
  %47 = tail call double @llvm.fmuladd.f64(double %46, double %14, double %45)
  store double %47, ptr %44, align 8, !tbaa !12
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %exitcond.not.1 = icmp eq i64 %indvars.iv.next.1, %wide.trip.count
  br i1 %exitcond.not.1, label %._crit_edge, label %.lr.ph, !llvm.loop !24
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fmuladd.f64(double, double, double) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <2 x double> @llvm.fmuladd.v2f64(<2 x double>, <2 x double>, <2 x double>) #2

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" }
attributes #1 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #2 = { 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, !10, i64 8}
!6 = !{!"", !7, i64 0, !7, i64 4, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!10, !10, i64 0}
!12 = !{!13, !13, i64 0}
!13 = !{!"double", !8, i64 0}
!14 = !{!6, !7, i64 4}
!15 = !{!16}
!16 = distinct !{!16, !17}
!17 = distinct !{!17, !"LVerDomain"}
!18 = !{!19}
!19 = distinct !{!19, !17}
!20 = distinct !{!20, !21, !22, !23}
!21 = !{!"llvm.loop.mustprogress"}
!22 = !{!"llvm.loop.isvectorized", i32 1}
!23 = !{!"llvm.loop.unroll.runtime.disable"}
!24 = distinct !{!24, !21, !22}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass