; LLVM IR from CLASS-SZ/class_sz :: class-sz/tools (r8lib)

; 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 @r8mat_identity(i32 noundef %0, ptr noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !5
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %38, %2
  %9 = load i32, ptr %6, align 4, !tbaa !5
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = icmp slt i32 %9, %10
  br i1 %11, label %12, label %41

12:                                               ; preds = %8
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %34, %12
  %14 = load i32, ptr %5, align 4, !tbaa !5
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = icmp slt i32 %14, %15
  br i1 %16, label %17, label %37

17:                                               ; preds = %13
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = load i32, ptr %6, align 4, !tbaa !5
  %20 = icmp eq i32 %18, %19
  br i1 %20, label %21, label %26

21:                                               ; preds = %17
  %22 = load ptr, ptr %4, align 8, !tbaa !9
  %23 = load i32, ptr %7, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds double, ptr %22, i64 %24
  store double 1.000000e+00, ptr %25, align 8, !tbaa !11
  br label %31

26:                                               ; preds = %17
  %27 = load ptr, ptr %4, align 8, !tbaa !9
  %28 = load i32, ptr %7, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds double, ptr %27, i64 %29
  store double 0.000000e+00, ptr %30, align 8, !tbaa !11
  br label %31

31:                                               ; preds = %26, %21
  %32 = load i32, ptr %7, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %7, align 4, !tbaa !5
  br label %34

34:                                               ; preds = %31
  %35 = load i32, ptr %5, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %5, align 4, !tbaa !5
  br label %13, !llvm.loop !13

37:                                               ; preds = %13
  br label %38

38:                                               ; preds = %37
  %39 = load i32, ptr %6, align 4, !tbaa !5
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %6, align 4, !tbaa !5
  br label %8, !llvm.loop !15

41:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"double", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}


; 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(argmem: write) uwtable
define dso_local void @r8mat_identity(i32 noundef %0, ptr nocapture noundef writeonly %1) local_unnamed_addr #0 {
  %3 = icmp sgt i32 %0, 0
  br i1 %3, label %.preheader.us.preheader, label %._crit_edge19

.preheader.us.preheader:                          ; preds = %2
  %4 = zext nneg i32 %0 to i64
  %min.iters.check = icmp ult i32 %0, 4
  %n.vec = and i64 %4, 2147483644
  %ind.end22 = trunc nuw nsw i64 %n.vec to i32
  %cmp.n = icmp eq i64 %n.vec, %4
  br label %.preheader.us

.preheader.us:                                    ; preds = %.preheader.us.preheader, %._crit_edge.us
  %.018.us = phi i64 [ %indvars.iv.next.lcssa, %._crit_edge.us ], [ 0, %.preheader.us.preheader ]
  %.01217.us = phi i32 [ %17, %._crit_edge.us ], [ 0, %.preheader.us.preheader ]
  %sext = shl i64 %.018.us, 32
  %5 = ashr exact i64 %sext, 32
  br i1 %min.iters.check, label %scalar.ph.preheader, label %vector.ph

vector.ph:                                        ; preds = %.preheader.us
  %ind.end = add nsw i64 %5, %n.vec
  %broadcast.splatinsert = insertelement <2 x i32> poison, i32 %.01217.us, i64 0
  %broadcast.splat = shufflevector <2 x i32> %broadcast.splatinsert, <2 x i32> poison, <2 x i32> zeroinitializer
  %6 = getelementptr double, ptr %1, i64 %5
  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 i32> [ <i32 0, i32 1>, %vector.ph ], [ %vec.ind.next, %vector.body ]
  %step.add = add <2 x i32> %vec.ind, <i32 2, i32 2>
  %7 = icmp eq <2 x i32> %vec.ind, %broadcast.splat
  %8 = icmp eq <2 x i32> %step.add, %broadcast.splat
  %9 = select <2 x i1> %7, <2 x double> <double 1.000000e+00, double 1.000000e+00>, <2 x double> zeroinitializer
  %10 = select <2 x i1> %8, <2 x double> <double 1.000000e+00, double 1.000000e+00>, <2 x double> zeroinitializer
  %11 = getelementptr double, ptr %6, i64 %index
  %12 = getelementptr inbounds i8, ptr %11, i64 16
  store <2 x double> %9, ptr %11, align 8
  store <2 x double> %10, ptr %12, align 8
  %index.next = add nuw i64 %index, 4
  %vec.ind.next = add <2 x i32> %vec.ind, <i32 4, i32 4>
  %13 = icmp eq i64 %index.next, %n.vec
  br i1 %13, label %middle.block, label %vector.body, !llvm.loop !5

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 [ %5, %.preheader.us ], [ %ind.end, %middle.block ]
  %.01315.us.ph = phi i32 [ 0, %.preheader.us ], [ %ind.end22, %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 ]
  %.01315.us = phi i32 [ %16, %scalar.ph ], [ %.01315.us.ph, %scalar.ph.preheader ]
  %14 = icmp eq i32 %.01315.us, %.01217.us
  %.sink = select i1 %14, double 1.000000e+00, double 0.000000e+00
  %15 = getelementptr inbounds double, ptr %1, i64 %indvars.iv
  store double %.sink, ptr %15, align 8
  %indvars.iv.next = add nsw i64 %indvars.iv, 1
  %16 = add nuw nsw i32 %.01315.us, 1
  %exitcond.not = icmp eq i32 %16, %0
  br i1 %exitcond.not, label %._crit_edge.us, label %scalar.ph, !llvm.loop !9

._crit_edge.us:                                   ; preds = %scalar.ph, %middle.block
  %indvars.iv.next.lcssa = phi i64 [ %ind.end, %middle.block ], [ %indvars.iv.next, %scalar.ph ]
  %17 = add nuw nsw i32 %.01217.us, 1
  %exitcond21.not = icmp eq i32 %17, %0
  br i1 %exitcond21.not, label %._crit_edge19, label %.preheader.us, !llvm.loop !10

._crit_edge19:                                    ; preds = %._crit_edge.us, %2
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: write) 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 = distinct !{!5, !6, !7, !8}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!"llvm.loop.isvectorized", i32 1}
!8 = !{!"llvm.loop.unroll.runtime.disable"}
!9 = distinct !{!9, !6, !8, !7}
!10 = distinct !{!10, !6}


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