; LLVM IR from AlgoGenesis/C :: Divide and Conquer/Strassen's Algorithm for Matrix Multiplication (program)

; 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 @subtractMatrix(ptr noundef %0, ptr noundef %1, ptr noundef %2, i32 noundef %3) #1 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store ptr %2, ptr %7, align 8, !tbaa !5
  store i32 %3, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %12

12:                                               ; preds = %55, %4
  %13 = load i32, ptr %9, align 4, !tbaa !9
  %14 = load i32, ptr %8, align 4, !tbaa !9
  %15 = icmp slt i32 %13, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %12
  store i32 2, ptr %10, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  br label %58

17:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #2
  store i32 0, ptr %11, align 4, !tbaa !9
  br label %18

18:                                               ; preds = %51, %17
  %19 = load i32, ptr %11, align 4, !tbaa !9
  %20 = load i32, ptr %8, align 4, !tbaa !9
  %21 = icmp slt i32 %19, %20
  br i1 %21, label %23, label %22

22:                                               ; preds = %18
  store i32 5, ptr %10, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #2
  br label %54

23:                                               ; preds = %18
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = load i32, ptr %9, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds ptr, ptr %24, i64 %26
  %28 = load ptr, ptr %27, align 8, !tbaa !5
  %29 = load i32, ptr %11, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds i32, ptr %28, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !9
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  %34 = load i32, ptr %9, align 4, !tbaa !9
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds ptr, ptr %33, i64 %35
  %37 = load ptr, ptr %36, align 8, !tbaa !5
  %38 = load i32, ptr %11, align 4, !tbaa !9
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds i32, ptr %37, i64 %39
  %41 = load i32, ptr %40, align 4, !tbaa !9
  %42 = sub nsw i32 %32, %41
  %43 = load ptr, ptr %7, align 8, !tbaa !5
  %44 = load i32, ptr %9, align 4, !tbaa !9
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds ptr, ptr %43, i64 %45
  %47 = load ptr, ptr %46, align 8, !tbaa !5
  %48 = load i32, ptr %11, align 4, !tbaa !9
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds i32, ptr %47, i64 %49
  store i32 %42, ptr %50, align 4, !tbaa !9
  br label %51

51:                                               ; preds = %23
  %52 = load i32, ptr %11, align 4, !tbaa !9
  %53 = add nsw i32 %52, 1
  store i32 %53, ptr %11, align 4, !tbaa !9
  br label %18, !llvm.loop !11

54:                                               ; preds = %22
  br label %55

55:                                               ; preds = %54
  %56 = load i32, ptr %9, align 4, !tbaa !9
  %57 = add nsw i32 %56, 1
  store i32 %57, ptr %9, align 4, !tbaa !9
  br label %12, !llvm.loop !13

58:                                               ; preds = %16
  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 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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 @subtractMatrix(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, ptr nocapture noundef readonly %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = icmp sgt i32 %3, 0
  br i1 %5, label %.preheader.us.preheader, label %._crit_edge18

.preheader.us.preheader:                          ; preds = %4
  %wide.trip.count23 = zext nneg i32 %3 to i64
  %min.iters.check = icmp ult i32 %3, 8
  %n.vec = and i64 %wide.trip.count23, 2147483640
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count23
  %xtraiter = and i64 %wide.trip.count23, 3
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br label %.preheader.us

.preheader.us:                                    ; preds = %.preheader.us.preheader, %._crit_edge.us
  %indvars.iv20 = phi i64 [ 0, %.preheader.us.preheader ], [ %indvars.iv.next21, %._crit_edge.us ]
  %6 = getelementptr inbounds ptr, ptr %0, i64 %indvars.iv20
  %7 = load ptr, ptr %6, align 8, !tbaa !5
  %8 = getelementptr inbounds ptr, ptr %1, i64 %indvars.iv20
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = getelementptr inbounds ptr, ptr %2, i64 %indvars.iv20
  %11 = load ptr, ptr %10, align 8, !tbaa !5
  br i1 %min.iters.check, label %scalar.ph.preheader, label %vector.memcheck

vector.memcheck:                                  ; preds = %.preheader.us
  %12 = ptrtoint ptr %11 to i64
  %13 = ptrtoint ptr %9 to i64
  %14 = ptrtoint ptr %7 to i64
  %15 = sub i64 %12, %14
  %diff.check = icmp ult i64 %15, 32
  %16 = sub i64 %12, %13
  %diff.check25 = icmp ult i64 %16, 32
  %conflict.rdx = or i1 %diff.check, %diff.check25
  br i1 %conflict.rdx, label %scalar.ph.preheader, label %vector.body

vector.body:                                      ; preds = %vector.memcheck, %vector.body
  %index = phi i64 [ %index.next, %vector.body ], [ 0, %vector.memcheck ]
  %17 = getelementptr inbounds i32, ptr %7, i64 %index
  %18 = getelementptr inbounds i8, ptr %17, i64 16
  %wide.load = load <4 x i32>, ptr %17, align 4, !tbaa !9
  %wide.load26 = load <4 x i32>, ptr %18, align 4, !tbaa !9
  %19 = getelementptr inbounds i32, ptr %9, i64 %index
  %20 = getelementptr inbounds i8, ptr %19, i64 16
  %wide.load27 = load <4 x i32>, ptr %19, align 4, !tbaa !9
  %wide.load28 = load <4 x i32>, ptr %20, align 4, !tbaa !9
  %21 = sub nsw <4 x i32> %wide.load, %wide.load27
  %22 = sub nsw <4 x i32> %wide.load26, %wide.load28
  %23 = getelementptr inbounds i32, ptr %11, i64 %index
  %24 = getelementptr inbounds i8, ptr %23, i64 16
  store <4 x i32> %21, ptr %23, align 4, !tbaa !9
  store <4 x i32> %22, ptr %24, align 4, !tbaa !9
  %index.next = add nuw i64 %index, 8
  %25 = icmp eq i64 %index.next, %n.vec
  br i1 %25, label %middle.block, label %vector.body, !llvm.loop !11

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

scalar.ph.preheader:                              ; preds = %middle.block, %vector.memcheck, %.preheader.us
  %indvars.iv.ph = phi i64 [ 0, %vector.memcheck ], [ 0, %.preheader.us ], [ %n.vec, %middle.block ]
  br i1 %lcmp.mod.not, label %scalar.ph.prol.loopexit, label %scalar.ph.prol

scalar.ph.prol:                                   ; preds = %scalar.ph.preheader, %scalar.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %scalar.ph.prol ], [ %indvars.iv.ph, %scalar.ph.preheader ]
  %prol.iter = phi i64 [ %prol.iter.next, %scalar.ph.prol ], [ 0, %scalar.ph.preheader ]
  %26 = getelementptr inbounds i32, ptr %7, i64 %indvars.iv.prol
  %27 = load i32, ptr %26, align 4, !tbaa !9
  %28 = getelementptr inbounds i32, ptr %9, i64 %indvars.iv.prol
  %29 = load i32, ptr %28, align 4, !tbaa !9
  %30 = sub nsw i32 %27, %29
  %31 = getelementptr inbounds i32, ptr %11, i64 %indvars.iv.prol
  store i32 %30, ptr %31, align 4, !tbaa !9
  %indvars.iv.next.prol = add nuw nsw i64 %indvars.iv.prol, 1
  %prol.iter.next = add i64 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i64 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %scalar.ph.prol.loopexit, label %scalar.ph.prol, !llvm.loop !15

scalar.ph.prol.loopexit:                          ; preds = %scalar.ph.prol, %scalar.ph.preheader
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %scalar.ph.preheader ], [ %indvars.iv.next.prol, %scalar.ph.prol ]
  %32 = sub nsw i64 %indvars.iv.ph, %wide.trip.count23
  %33 = icmp ugt i64 %32, -4
  br i1 %33, label %._crit_edge.us, label %scalar.ph

scalar.ph:                                        ; preds = %scalar.ph.prol.loopexit, %scalar.ph
  %indvars.iv = phi i64 [ %indvars.iv.next.3, %scalar.ph ], [ %indvars.iv.unr, %scalar.ph.prol.loopexit ]
  %34 = getelementptr inbounds i32, ptr %7, i64 %indvars.iv
  %35 = load i32, ptr %34, align 4, !tbaa !9
  %36 = getelementptr inbounds i32, ptr %9, i64 %indvars.iv
  %37 = load i32, ptr %36, align 4, !tbaa !9
  %38 = sub nsw i32 %35, %37
  %39 = getelementptr inbounds i32, ptr %11, i64 %indvars.iv
  store i32 %38, ptr %39, align 4, !tbaa !9
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %40 = getelementptr inbounds i32, ptr %7, i64 %indvars.iv.next
  %41 = load i32, ptr %40, align 4, !tbaa !9
  %42 = getelementptr inbounds i32, ptr %9, i64 %indvars.iv.next
  %43 = load i32, ptr %42, align 4, !tbaa !9
  %44 = sub nsw i32 %41, %43
  %45 = getelementptr inbounds i32, ptr %11, i64 %indvars.iv.next
  store i32 %44, ptr %45, align 4, !tbaa !9
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %46 = getelementptr inbounds i32, ptr %7, i64 %indvars.iv.next.1
  %47 = load i32, ptr %46, align 4, !tbaa !9
  %48 = getelementptr inbounds i32, ptr %9, i64 %indvars.iv.next.1
  %49 = load i32, ptr %48, align 4, !tbaa !9
  %50 = sub nsw i32 %47, %49
  %51 = getelementptr inbounds i32, ptr %11, i64 %indvars.iv.next.1
  store i32 %50, ptr %51, align 4, !tbaa !9
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %52 = getelementptr inbounds i32, ptr %7, i64 %indvars.iv.next.2
  %53 = load i32, ptr %52, align 4, !tbaa !9
  %54 = getelementptr inbounds i32, ptr %9, i64 %indvars.iv.next.2
  %55 = load i32, ptr %54, align 4, !tbaa !9
  %56 = sub nsw i32 %53, %55
  %57 = getelementptr inbounds i32, ptr %11, i64 %indvars.iv.next.2
  store i32 %56, ptr %57, align 4, !tbaa !9
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %exitcond.not.3 = icmp eq i64 %indvars.iv.next.3, %wide.trip.count23
  br i1 %exitcond.not.3, label %._crit_edge.us, label %scalar.ph, !llvm.loop !17

._crit_edge.us:                                   ; preds = %scalar.ph.prol.loopexit, %scalar.ph, %middle.block
  %indvars.iv.next21 = add nuw nsw i64 %indvars.iv20, 1
  %exitcond24.not = icmp eq i64 %indvars.iv.next21, %wide.trip.count23
  br i1 %exitcond24.not, label %._crit_edge18, label %.preheader.us, !llvm.loop !18

._crit_edge18:                                    ; preds = %._crit_edge.us, %4
  ret void
}

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 = !{!"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 = distinct !{!11, !12, !13, !14}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!"llvm.loop.isvectorized", i32 1}
!14 = !{!"llvm.loop.unroll.runtime.disable"}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.unroll.disable"}
!17 = distinct !{!17, !12, !13}
!18 = distinct !{!18, !12}


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