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

; 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 }

@.str.2 = external hidden unnamed_addr constant [13 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @make_matrix(i32 noundef, i32 noundef) #0

; 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

; Function Attrs: nounwind uwtable
declare dso_local void @free_matrix(ptr noundef) #0

declare i32 @printf(ptr noundef, ...) #2

; Function Attrs: nounwind uwtable
declare dso_local void @print_matrix(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local void @reduce_matrix_rows(ptr noundef, i32 noundef, i32 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  %6 = call ptr @make_matrix(i32 noundef 3, i32 noundef 4)
  store ptr %6, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %7

7:                                                ; preds = %42, %0
  %8 = load i32, ptr %3, align 4, !tbaa !9
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.Matrix, ptr %9, i32 0, i32 0
  %11 = load i32, ptr %10, align 8, !tbaa !11
  %12 = icmp slt i32 %8, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %7
  store i32 2, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %45

14:                                               ; preds = %7
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %15

15:                                               ; preds = %38, %14
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.Matrix, ptr %17, i32 0, i32 1
  %19 = load i32, ptr %18, align 4, !tbaa !13
  %20 = icmp slt i32 %16, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %15
  store i32 5, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  br label %41

22:                                               ; preds = %15
  %23 = load i32, ptr %3, align 4, !tbaa !9
  %24 = load i32, ptr %5, align 4, !tbaa !9
  %25 = add nsw i32 %23, %24
  %26 = add nsw i32 %25, 1
  %27 = sitofp i32 %26 to double
  %28 = load ptr, ptr %2, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.Matrix, ptr %28, i32 0, i32 2
  %30 = load ptr, ptr %29, align 8, !tbaa !14
  %31 = load i32, ptr %3, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds ptr, ptr %30, i64 %32
  %34 = load ptr, ptr %33, align 8, !tbaa !5
  %35 = load i32, ptr %5, align 4, !tbaa !9
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds double, ptr %34, i64 %36
  store double %27, ptr %37, align 8, !tbaa !15
  br label %38

38:                                               ; preds = %22
  %39 = load i32, ptr %5, align 4, !tbaa !9
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %5, align 4, !tbaa !9
  br label %15, !llvm.loop !17

41:                                               ; preds = %21
  br label %42

42:                                               ; preds = %41
  %43 = load i32, ptr %3, align 4, !tbaa !9
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %3, align 4, !tbaa !9
  br label %7, !llvm.loop !19

45:                                               ; preds = %13
  %46 = load ptr, ptr %2, align 8, !tbaa !5
  call void @print_matrix(ptr noundef %46)
  %47 = call i32 (ptr, ...) @printf(ptr noundef @.str.2)
  %48 = load ptr, ptr %2, align 8, !tbaa !5
  call void @reduce_matrix_rows(ptr noundef %48, i32 noundef 1, i32 noundef 0)
  %49 = load ptr, ptr %2, align 8, !tbaa !5
  call void @reduce_matrix_rows(ptr noundef %49, i32 noundef 2, i32 noundef 0)
  %50 = load ptr, ptr %2, align 8, !tbaa !5
  call void @print_matrix(ptr noundef %50)
  %51 = load ptr, ptr %2, align 8, !tbaa !5
  call void @free_matrix(ptr noundef %51)
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  %52 = load i32, ptr %1, align 4
  ret i32 %52
}

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 = { "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 #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, !10, i64 0}
!12 = !{!"", !10, i64 0, !10, i64 4, !6, i64 8}
!13 = !{!12, !10, i64 4}
!14 = !{!12, !6, i64 8}
!15 = !{!16, !16, i64 0}
!16 = !{!"double", !7, i64 0}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}
!19 = distinct !{!19, !18}


; 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"

@.str.2 = external hidden unnamed_addr constant [13 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @make_matrix(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @free_matrix(ptr noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare dso_local void @print_matrix(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @reduce_matrix_rows(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call ptr @make_matrix(i32 noundef 3, i32 noundef 4)
  %2 = load i32, ptr %1, align 8, !tbaa !5
  %3 = icmp sgt i32 %2, 0
  br i1 %3, label %.preheader.lr.ph, label %._crit_edge19

.preheader.lr.ph:                                 ; preds = %0
  %4 = getelementptr inbounds i8, ptr %1, i64 4
  %5 = load i32, ptr %4, align 4, !tbaa !11
  %6 = icmp sgt i32 %5, 0
  br i1 %6, label %.preheader.lr.ph.split.us, label %._crit_edge19

.preheader.lr.ph.split.us:                        ; preds = %.preheader.lr.ph
  %7 = getelementptr inbounds i8, ptr %1, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !12
  %wide.trip.count25 = zext nneg i32 %2 to i64
  %wide.trip.count = zext nneg i32 %5 to i64
  %min.iters.check = icmp ult i32 %5, 4
  %n.vec = and i64 %wide.trip.count, 2147483644
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br label %.preheader.us

.preheader.us:                                    ; preds = %._crit_edge.us, %.preheader.lr.ph.split.us
  %indvars.iv22 = phi i64 [ %indvars.iv.next23, %._crit_edge.us ], [ 0, %.preheader.lr.ph.split.us ]
  %indvars.iv.next23 = add nuw nsw i64 %indvars.iv22, 1
  %9 = getelementptr inbounds ptr, ptr %8, i64 %indvars.iv22
  %10 = load ptr, ptr %9, align 8, !tbaa !13
  br i1 %min.iters.check, label %scalar.ph.preheader, label %vector.ph

vector.ph:                                        ; preds = %.preheader.us
  %broadcast.splatinsert = insertelement <2 x i64> poison, i64 %indvars.iv.next23, i64 0
  %broadcast.splat = shufflevector <2 x i64> %broadcast.splatinsert, <2 x i64> 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 ]
  %vec.ind = phi <2 x i64> [ <i64 0, i64 1>, %vector.ph ], [ %vec.ind.next, %vector.body ]
  %step.add = add <2 x i64> %vec.ind, <i64 2, i64 2>
  %11 = add nuw nsw <2 x i64> %broadcast.splat, %vec.ind
  %12 = add nuw nsw <2 x i64> %broadcast.splat, %step.add
  %13 = trunc <2 x i64> %11 to <2 x i32>
  %14 = trunc <2 x i64> %12 to <2 x i32>
  %15 = uitofp <2 x i32> %13 to <2 x double>
  %16 = uitofp <2 x i32> %14 to <2 x double>
  %17 = getelementptr inbounds double, ptr %10, i64 %index
  %18 = getelementptr inbounds i8, ptr %17, i64 16
  store <2 x double> %15, ptr %17, align 8, !tbaa !14
  store <2 x double> %16, ptr %18, align 8, !tbaa !14
  %index.next = add nuw i64 %index, 4
  %vec.ind.next = add <2 x i64> %vec.ind, <i64 4, i64 4>
  %19 = icmp eq i64 %index.next, %n.vec
  br i1 %19, label %middle.block, label %vector.body, !llvm.loop !16

middle.block:                                     ; preds = %vector.body
  br i1 %cmp.n, label %._crit_edge.us, label %scalar.ph.preheader

scalar.ph.preheader:                              ; preds = %middle.block, %.preheader.us
  %indvars.iv.ph = phi i64 [ 0, %.preheader.us ], [ %n.vec, %middle.block ]
  br label %scalar.ph

scalar.ph:                                        ; preds = %scalar.ph.preheader, %scalar.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %scalar.ph ], [ %indvars.iv.ph, %scalar.ph.preheader ]
  %20 = add nuw nsw i64 %indvars.iv.next23, %indvars.iv
  %21 = trunc nuw i64 %20 to i32
  %22 = uitofp nneg i32 %21 to double
  %23 = getelementptr inbounds double, ptr %10, i64 %indvars.iv
  store double %22, ptr %23, align 8, !tbaa !14
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge.us, label %scalar.ph, !llvm.loop !20

._crit_edge.us:                                   ; preds = %scalar.ph, %middle.block
  %exitcond26.not = icmp eq i64 %indvars.iv.next23, %wide.trip.count25
  br i1 %exitcond26.not, label %._crit_edge19, label %.preheader.us, !llvm.loop !21

._crit_edge19:                                    ; preds = %._crit_edge.us, %.preheader.lr.ph, %0
  tail call void @print_matrix(ptr noundef nonnull %1)
  %24 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2)
  tail call void @reduce_matrix_rows(ptr noundef nonnull %1, i32 noundef 1, i32 noundef 0)
  tail call void @reduce_matrix_rows(ptr noundef nonnull %1, i32 noundef 2, i32 noundef 0)
  tail call void @print_matrix(ptr noundef nonnull %1)
  tail call void @free_matrix(ptr noundef nonnull %1)
  ret i32 0
}

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 = { nofree nounwind "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, !7, i64 0}
!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 = !{!6, !7, i64 4}
!12 = !{!6, !10, i64 8}
!13 = !{!10, !10, i64 0}
!14 = !{!15, !15, i64 0}
!15 = !{!"double", !8, i64 0}
!16 = distinct !{!16, !17, !18, !19}
!17 = !{!"llvm.loop.mustprogress"}
!18 = !{!"llvm.loop.isvectorized", i32 1}
!19 = !{!"llvm.loop.unroll.runtime.disable"}
!20 = distinct !{!20, !17, !19, !18}
!21 = distinct !{!21, !17}


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