; LLVM IR from drohmer/cgp :: library/cgp/06_mat/mat4/mat4.ll (ZN3cgp12matrix_stackIfLi4ELi4EE4fillEf)

; 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: mustprogress uwtable
define dso_local noundef nonnull align 4 dereferenceable(64) ptr @_ZN3cgp12matrix_stackIfLi4ELi4EE4fillEf(ptr noundef nonnull align 4 dereferenceable(64) %0, float noundef %1) #1 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca float, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store float %1, ptr %4, align 4, !tbaa !9
  %7 = load ptr, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %8 = call noundef ptr @_ZN3cgp12matrix_stackIfLi4ELi4EE5beginEv(ptr noundef nonnull align 4 dereferenceable(64) %7)
  store ptr %8, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %9 = call noundef ptr @_ZN3cgp12matrix_stackIfLi4ELi4EE3endEv(ptr noundef nonnull align 4 dereferenceable(64) %7)
  store ptr %9, ptr %6, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %17, %2
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = load ptr, ptr %6, align 8, !tbaa !5
  %13 = icmp ne ptr %11, %12
  br i1 %13, label %14, label %20

14:                                               ; preds = %10
  %15 = load float, ptr %4, align 4, !tbaa !9
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  store float %15, ptr %16, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %14
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = getelementptr inbounds float, ptr %18, i32 1
  store ptr %19, ptr %5, align 8, !tbaa !5
  br label %10, !llvm.loop !11

20:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret ptr %7
}

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_ZN3cgp12matrix_stackIfLi4ELi4EE5beginEv(ptr noundef nonnull align 4 dereferenceable(64)) #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_ZN3cgp12matrix_stackIfLi4ELi4EE3endEv(ptr noundef nonnull align 4 dereferenceable(64)) #1 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"float", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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: mustprogress uwtable
define dso_local noundef nonnull align 4 dereferenceable(64) ptr @_ZN3cgp12matrix_stackIfLi4ELi4EE4fillEf(ptr noundef nonnull returned align 4 dereferenceable(64) %0, float noundef %1) local_unnamed_addr #0 align 2 {
  %3 = tail call noundef ptr @_ZN3cgp12matrix_stackIfLi4ELi4EE5beginEv(ptr noundef nonnull align 4 dereferenceable(64) %0)
  %4 = tail call noundef ptr @_ZN3cgp12matrix_stackIfLi4ELi4EE3endEv(ptr noundef nonnull align 4 dereferenceable(64) %0)
  %.not6 = icmp eq ptr %3, %4
  br i1 %.not6, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %5 = ptrtoint ptr %4 to i64
  %6 = ptrtoint ptr %3 to i64
  %7 = add i64 %5, -4
  %8 = sub i64 %7, %6
  %9 = lshr i64 %8, 2
  %10 = add nuw nsw i64 %9, 1
  %min.iters.check = icmp ult i64 %8, 28
  br i1 %min.iters.check, label %.lr.ph.preheader9, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %10, 9223372036854775800
  %11 = shl i64 %n.vec, 2
  %ind.end = getelementptr i8, ptr %3, i64 %11
  %broadcast.splatinsert = insertelement <4 x float> poison, float %1, i64 0
  %broadcast.splat = shufflevector <4 x float> %broadcast.splatinsert, <4 x float> poison, <4 x i32> zeroinitializer
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %offset.idx = shl i64 %index, 2
  %next.gep = getelementptr i8, ptr %3, i64 %offset.idx
  %12 = getelementptr i8, ptr %next.gep, i64 16
  store <4 x float> %broadcast.splat, ptr %next.gep, align 4, !tbaa !5
  store <4 x float> %broadcast.splat, ptr %12, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %13 = icmp eq i64 %index.next, %n.vec
  br i1 %13, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %10, %n.vec
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader9

.lr.ph.preheader9:                                ; preds = %middle.block, %.lr.ph.preheader
  %.07.ph = phi ptr [ %3, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader9, %.lr.ph
  %.07 = phi ptr [ %14, %.lr.ph ], [ %.07.ph, %.lr.ph.preheader9 ]
  store float %1, ptr %.07, align 4, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %.07, i64 4
  %.not = icmp eq ptr %14, %4
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %2
  ret ptr %0
}

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_ZN3cgp12matrix_stackIfLi4ELi4EE5beginEv(ptr noundef nonnull align 4 dereferenceable(64)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_ZN3cgp12matrix_stackIfLi4ELi4EE3endEv(ptr noundef nonnull align 4 dereferenceable(64)) local_unnamed_addr #0 align 2

attributes #0 = { mustprogress 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 = !{!"float", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}


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