; LLVM IR from ksw2000/Data-Structure-in-C :: Array (02-動態宣告連續二維陣列)

; 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: nounwind uwtable
define dso_local ptr @allocate2D(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i64, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = sext i32 %8 to i64
  %10 = mul i64 8, %9
  store i64 %10, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %11 = load i64, ptr %5, align 8, !tbaa !9
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = mul i64 4, %13
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = mul i64 %14, %16
  %18 = add i64 %11, %17
  %19 = call noalias ptr @malloc(i64 noundef %18) #4
  store ptr %19, ptr %6, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %20

20:                                               ; preds = %37, %2
  %21 = load i32, ptr %7, align 4, !tbaa !5
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = icmp slt i32 %21, %22
  br i1 %23, label %24, label %40

24:                                               ; preds = %20
  %25 = load ptr, ptr %6, align 8, !tbaa !11
  %26 = load i64, ptr %5, align 8, !tbaa !9
  %27 = getelementptr inbounds ptr, ptr %25, i64 %26
  %28 = load i32, ptr %7, align 4, !tbaa !5
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = mul nsw i32 %28, %29
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds ptr, ptr %27, i64 %31
  %33 = load ptr, ptr %6, align 8, !tbaa !11
  %34 = load i32, ptr %7, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds ptr, ptr %33, i64 %35
  store ptr %32, ptr %36, align 8, !tbaa !11
  br label %37

37:                                               ; preds = %24
  %38 = load i32, ptr %7, align 4, !tbaa !5
  %39 = add nsw i32 %38, 1
  store i32 %39, ptr %7, align 4, !tbaa !5
  br label %20, !llvm.loop !13

40:                                               ; preds = %20
  %41 = load ptr, ptr %6, align 8, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  ret ptr %41
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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 = { nounwind allocsize(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 #3 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"any pointer", !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: nofree nounwind memory(write, argmem: none, inaccessiblemem: readwrite) uwtable
define dso_local noundef ptr @allocate2D(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = sext i32 %0 to i64
  %4 = shl nsw i64 %3, 3
  %5 = shl nsw i64 %3, 2
  %6 = sext i32 %1 to i64
  %7 = mul i64 %5, %6
  %8 = add i64 %7, %4
  %9 = tail call noalias ptr @malloc(i64 noundef %8) #2
  %10 = icmp sgt i32 %0, 0
  br i1 %10, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2
  %11 = getelementptr inbounds ptr, ptr %9, i64 %4
  %wide.trip.count = zext nneg i32 %0 to i64
  %xtraiter = and i64 %wide.trip.count, 3
  %12 = icmp ult i32 %0, 4
  br i1 %12, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.new

.lr.ph.new:                                       ; preds = %.lr.ph
  %unroll_iter = and i64 %wide.trip.count, 2147483644
  br label %13

13:                                               ; preds = %13, %.lr.ph.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.new ], [ %indvars.iv.next.3, %13 ]
  %niter = phi i64 [ 0, %.lr.ph.new ], [ %niter.next.3, %13 ]
  %14 = mul nsw i64 %indvars.iv, %6
  %15 = getelementptr inbounds ptr, ptr %11, i64 %14
  %16 = getelementptr inbounds ptr, ptr %9, i64 %indvars.iv
  store ptr %15, ptr %16, align 8, !tbaa !5
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %17 = mul nsw i64 %indvars.iv.next, %6
  %18 = getelementptr inbounds ptr, ptr %11, i64 %17
  %19 = getelementptr inbounds ptr, ptr %9, i64 %indvars.iv.next
  store ptr %18, ptr %19, align 8, !tbaa !5
  %indvars.iv.next.1 = or disjoint i64 %indvars.iv, 2
  %20 = mul nsw i64 %indvars.iv.next.1, %6
  %21 = getelementptr inbounds ptr, ptr %11, i64 %20
  %22 = getelementptr inbounds ptr, ptr %9, i64 %indvars.iv.next.1
  store ptr %21, ptr %22, align 8, !tbaa !5
  %indvars.iv.next.2 = or disjoint i64 %indvars.iv, 3
  %23 = mul nsw i64 %indvars.iv.next.2, %6
  %24 = getelementptr inbounds ptr, ptr %11, i64 %23
  %25 = getelementptr inbounds ptr, ptr %9, i64 %indvars.iv.next.2
  store ptr %24, ptr %25, align 8, !tbaa !5
  %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 %13, !llvm.loop !9

._crit_edge.loopexit.unr-lcssa:                   ; preds = %13, %.lr.ph
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next.3, %13 ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.epil.preheader

.epil.preheader:                                  ; preds = %._crit_edge.loopexit.unr-lcssa, %.epil.preheader
  %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %.epil.preheader ], [ %indvars.iv.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.epil.preheader ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %26 = mul nsw i64 %indvars.iv.epil, %6
  %27 = getelementptr inbounds ptr, ptr %11, i64 %26
  %28 = getelementptr inbounds ptr, ptr %9, i64 %indvars.iv.epil
  store ptr %27, ptr %28, align 8, !tbaa !5
  %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 %.epil.preheader, !llvm.loop !11

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.epil.preheader, %2
  ret ptr %9
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

attributes #0 = { nofree nounwind memory(write, argmem: none, inaccessiblemem: readwrite) 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 nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 allocsize(0) }

!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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.unroll.disable"}


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