; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/math/matrix_transpose.ll (Z9transposeiiPPiS0_)

; 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: mustprogress nounwind uwtable
define dso_local void @_Z9transposeiiPPiS0_(i32 noundef %0, i32 noundef %1, ptr noundef %2, ptr noundef %3) #0 {
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store i32 %0, ptr %5, align 4, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !5
  store ptr %2, ptr %7, align 8, !tbaa !9
  store ptr %3, ptr %8, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  store i32 0, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 0, ptr %10, align 4, !tbaa !5
  store i32 0, ptr %9, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %42, %4
  %12 = load i32, ptr %9, align 4, !tbaa !5
  %13 = load i32, ptr %6, align 4, !tbaa !5
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %15, label %45

15:                                               ; preds = %11
  store i32 0, ptr %10, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %38, %15
  %17 = load i32, ptr %10, align 4, !tbaa !5
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = icmp slt i32 %17, %18
  br i1 %19, label %20, label %41

20:                                               ; preds = %16
  %21 = load ptr, ptr %7, align 8, !tbaa !9
  %22 = load i32, ptr %10, align 4, !tbaa !5
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds ptr, ptr %21, i64 %23
  %25 = load ptr, ptr %24, align 8, !tbaa !9
  %26 = load i32, ptr %9, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds i32, ptr %25, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = load ptr, ptr %8, align 8, !tbaa !9
  %31 = load i32, ptr %9, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds ptr, ptr %30, i64 %32
  %34 = load ptr, ptr %33, align 8, !tbaa !9
  %35 = load i32, ptr %10, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds i32, ptr %34, i64 %36
  store i32 %29, ptr %37, align 4, !tbaa !5
  br label %38

38:                                               ; preds = %20
  %39 = load i32, ptr %10, align 4, !tbaa !5
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %10, align 4, !tbaa !5
  br label %16, !llvm.loop !11

41:                                               ; preds = %16
  br label %42

42:                                               ; preds = %41
  %43 = load i32, ptr %9, align 4, !tbaa !5
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %9, align 4, !tbaa !5
  br label %11, !llvm.loop !13

45:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 4, 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 = { 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 #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 = !{!"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 = 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: mustprogress nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @_Z9transposeiiPPiS0_(i32 noundef %0, i32 noundef %1, ptr nocapture noundef readonly %2, ptr nocapture noundef readonly %3) local_unnamed_addr #0 {
  %5 = icmp sgt i32 %1, 0
  %6 = icmp sgt i32 %0, 0
  %or.cond = and i1 %5, %6
  br i1 %or.cond, label %.preheader.us.preheader, label %._crit_edge14

.preheader.us.preheader:                          ; preds = %4
  %wide.trip.count20 = zext nneg i32 %1 to i64
  %wide.trip.count = zext nneg i32 %0 to i64
  %xtraiter = and i64 %wide.trip.count, 3
  %7 = icmp ult i32 %0, 4
  %unroll_iter = and i64 %wide.trip.count, 2147483644
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br label %.preheader.us

.preheader.us:                                    ; preds = %.preheader.us.preheader, %._crit_edge.us
  %indvars.iv17 = phi i64 [ 0, %.preheader.us.preheader ], [ %indvars.iv.next18, %._crit_edge.us ]
  %8 = getelementptr inbounds ptr, ptr %3, i64 %indvars.iv17
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  br i1 %7, label %._crit_edge.us.unr-lcssa, label %.preheader.us.new

.preheader.us.new:                                ; preds = %.preheader.us, %.preheader.us.new
  %indvars.iv = phi i64 [ %indvars.iv.next.3, %.preheader.us.new ], [ 0, %.preheader.us ]
  %niter = phi i64 [ %niter.next.3, %.preheader.us.new ], [ 0, %.preheader.us ]
  %10 = getelementptr inbounds ptr, ptr %2, i64 %indvars.iv
  %11 = load ptr, ptr %10, align 8, !tbaa !5
  %12 = getelementptr inbounds i32, ptr %11, i64 %indvars.iv17
  %13 = load i32, ptr %12, align 4, !tbaa !9
  %14 = getelementptr inbounds i32, ptr %9, i64 %indvars.iv
  store i32 %13, ptr %14, align 4, !tbaa !9
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %15 = getelementptr inbounds ptr, ptr %2, i64 %indvars.iv.next
  %16 = load ptr, ptr %15, align 8, !tbaa !5
  %17 = getelementptr inbounds i32, ptr %16, i64 %indvars.iv17
  %18 = load i32, ptr %17, align 4, !tbaa !9
  %19 = getelementptr inbounds i32, ptr %9, i64 %indvars.iv.next
  store i32 %18, ptr %19, align 4, !tbaa !9
  %indvars.iv.next.1 = or disjoint i64 %indvars.iv, 2
  %20 = getelementptr inbounds ptr, ptr %2, i64 %indvars.iv.next.1
  %21 = load ptr, ptr %20, align 8, !tbaa !5
  %22 = getelementptr inbounds i32, ptr %21, i64 %indvars.iv17
  %23 = load i32, ptr %22, align 4, !tbaa !9
  %24 = getelementptr inbounds i32, ptr %9, i64 %indvars.iv.next.1
  store i32 %23, ptr %24, align 4, !tbaa !9
  %indvars.iv.next.2 = or disjoint i64 %indvars.iv, 3
  %25 = getelementptr inbounds ptr, ptr %2, i64 %indvars.iv.next.2
  %26 = load ptr, ptr %25, align 8, !tbaa !5
  %27 = getelementptr inbounds i32, ptr %26, i64 %indvars.iv17
  %28 = load i32, ptr %27, align 4, !tbaa !9
  %29 = getelementptr inbounds i32, ptr %9, i64 %indvars.iv.next.2
  store i32 %28, ptr %29, align 4, !tbaa !9
  %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.us.unr-lcssa, label %.preheader.us.new, !llvm.loop !11

._crit_edge.us.unr-lcssa:                         ; preds = %.preheader.us.new, %.preheader.us
  %indvars.iv.unr = phi i64 [ 0, %.preheader.us ], [ %indvars.iv.next.3, %.preheader.us.new ]
  br i1 %lcmp.mod.not, label %._crit_edge.us, label %.epil.preheader

.epil.preheader:                                  ; preds = %._crit_edge.us.unr-lcssa, %.epil.preheader
  %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %.epil.preheader ], [ %indvars.iv.unr, %._crit_edge.us.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.epil.preheader ], [ 0, %._crit_edge.us.unr-lcssa ]
  %30 = getelementptr inbounds ptr, ptr %2, i64 %indvars.iv.epil
  %31 = load ptr, ptr %30, align 8, !tbaa !5
  %32 = getelementptr inbounds i32, ptr %31, i64 %indvars.iv17
  %33 = load i32, ptr %32, align 4, !tbaa !9
  %34 = getelementptr inbounds i32, ptr %9, i64 %indvars.iv.epil
  store i32 %33, ptr %34, align 4, !tbaa !9
  %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.us, label %.epil.preheader, !llvm.loop !13

._crit_edge.us:                                   ; preds = %.epil.preheader, %._crit_edge.us.unr-lcssa
  %indvars.iv.next18 = add nuw nsw i64 %indvars.iv17, 1
  %exitcond21.not = icmp eq i64 %indvars.iv.next18, %wide.trip.count20
  br i1 %exitcond21.not, label %._crit_edge14, label %.preheader.us, !llvm.loop !15

._crit_edge14:                                    ; preds = %._crit_edge.us, %4
  ret void
}

attributes #0 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.unroll.disable"}
!15 = distinct !{!15, !12}


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