; 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: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fmuladd.f64(double, double, double) #1

; Function Attrs: nounwind uwtable
define dso_local void @r8vec_even(i32 noundef %0, double noundef %1, double noundef %2, ptr noundef %3) #2 {
  %5 = alloca i32, align 4
  %6 = alloca double, align 8
  %7 = alloca double, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  store i32 %0, ptr %5, align 4, !tbaa !5
  store double %1, ptr %6, align 8, !tbaa !9
  store double %2, ptr %7, align 8, !tbaa !9
  store ptr %3, ptr %8, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = icmp eq i32 %10, 1
  br i1 %11, label %12, label %19

12:                                               ; preds = %4
  %13 = load double, ptr %6, align 8, !tbaa !9
  %14 = load double, ptr %7, align 8, !tbaa !9
  %15 = fadd double %13, %14
  %16 = fmul double 5.000000e-01, %15
  %17 = load ptr, ptr %8, align 8, !tbaa !11
  %18 = getelementptr inbounds double, ptr %17, i64 0
  store double %16, ptr %18, align 8, !tbaa !9
  br label %49

19:                                               ; preds = %4
  store i32 1, ptr %9, align 4, !tbaa !5
  br label %20

20:                                               ; preds = %45, %19
  %21 = load i32, ptr %9, align 4, !tbaa !5
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = icmp sle i32 %21, %22
  br i1 %23, label %24, label %48

24:                                               ; preds = %20
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = load i32, ptr %9, align 4, !tbaa !5
  %27 = sub nsw i32 %25, %26
  %28 = sitofp i32 %27 to double
  %29 = load double, ptr %6, align 8, !tbaa !9
  %30 = load i32, ptr %9, align 4, !tbaa !5
  %31 = sub nsw i32 %30, 1
  %32 = sitofp i32 %31 to double
  %33 = load double, ptr %7, align 8, !tbaa !9
  %34 = fmul double %32, %33
  %35 = call double @llvm.fmuladd.f64(double %28, double %29, double %34)
  %36 = load i32, ptr %5, align 4, !tbaa !5
  %37 = sub nsw i32 %36, 1
  %38 = sitofp i32 %37 to double
  %39 = fdiv double %35, %38
  %40 = load ptr, ptr %8, align 8, !tbaa !11
  %41 = load i32, ptr %9, align 4, !tbaa !5
  %42 = sub nsw i32 %41, 1
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds double, ptr %40, i64 %43
  store double %39, ptr %44, align 8, !tbaa !9
  br label %45

45:                                               ; preds = %24
  %46 = load i32, ptr %9, align 4, !tbaa !5
  %47 = add nsw i32 %46, 1
  store i32 %47, ptr %9, align 4, !tbaa !5
  br label %20, !llvm.loop !13

48:                                               ; preds = %20
  br label %49

49:                                               ; preds = %48, %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #2 = { 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 #3 = { 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 = !{!"double", !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: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fmuladd.f64(double, double, double) #0

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: write) uwtable
define dso_local void @r8vec_even(i32 noundef %0, double noundef %1, double noundef %2, ptr nocapture noundef writeonly %3) local_unnamed_addr #1 {
  %5 = icmp eq i32 %0, 1
  br i1 %5, label %22, label %.preheader

.preheader:                                       ; preds = %4
  %.not15 = icmp slt i32 %0, 1
  br i1 %.not15, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader
  %6 = add nsw i32 %0, -1
  %7 = uitofp nneg i32 %6 to double
  %8 = add nuw i32 %0, 1
  %wide.trip.count = zext i32 %8 to i64
  %9 = zext nneg i32 %0 to i64
  %n.vec = and i64 %9, 2147483646
  %ind.end = or i64 %9, 1
  %broadcast.splatinsert = insertelement <2 x i32> poison, i32 %0, i64 0
  %broadcast.splat = shufflevector <2 x i32> %broadcast.splatinsert, <2 x i32> poison, <2 x i32> zeroinitializer
  %broadcast.splatinsert18 = insertelement <2 x double> poison, double %2, i64 0
  %broadcast.splat19 = shufflevector <2 x double> %broadcast.splatinsert18, <2 x double> poison, <2 x i32> zeroinitializer
  %broadcast.splatinsert20 = insertelement <2 x double> poison, double %1, i64 0
  %broadcast.splat21 = shufflevector <2 x double> %broadcast.splatinsert20, <2 x double> poison, <2 x i32> zeroinitializer
  %broadcast.splatinsert22 = insertelement <2 x double> poison, double %7, i64 0
  %broadcast.splat23 = shufflevector <2 x double> %broadcast.splatinsert22, <2 x double> poison, <2 x i32> zeroinitializer
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %.lr.ph
  %index = phi i64 [ 0, %.lr.ph ], [ %index.next, %vector.body ]
  %vec.ind = phi <2 x i32> [ <i32 1, i32 2>, %.lr.ph ], [ %vec.ind.next, %vector.body ]
  %10 = sub <2 x i32> %broadcast.splat, %vec.ind
  %11 = sitofp <2 x i32> %10 to <2 x double>
  %12 = or disjoint i64 %index, 1
  %13 = insertelement <2 x i64> poison, i64 %index, i64 0
  %14 = insertelement <2 x i64> %13, i64 %12, i64 1
  %15 = trunc <2 x i64> %14 to <2 x i32>
  %16 = sitofp <2 x i32> %15 to <2 x double>
  %17 = fmul <2 x double> %broadcast.splat19, %16
  %18 = tail call <2 x double> @llvm.fmuladd.v2f64(<2 x double> %11, <2 x double> %broadcast.splat21, <2 x double> %17)
  %19 = fdiv <2 x double> %18, %broadcast.splat23
  %20 = getelementptr inbounds double, ptr %3, i64 %index
  store <2 x double> %19, ptr %20, align 8, !tbaa !5
  %index.next = add nuw i64 %index, 2
  %vec.ind.next = add <2 x i32> %vec.ind, <i32 2, i32 2>
  %21 = icmp eq i64 %index.next, %n.vec
  br i1 %21, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %9
  br i1 %cmp.n, label %.loopexit, label %scalar.ph

22:                                               ; preds = %4
  %23 = fadd double %1, %2
  %24 = fmul double %23, 5.000000e-01
  store double %24, ptr %3, align 8, !tbaa !5
  br label %.loopexit

scalar.ph:                                        ; preds = %middle.block, %scalar.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %scalar.ph ], [ %ind.end, %middle.block ]
  %25 = trunc i64 %indvars.iv to i32
  %26 = sub i32 %0, %25
  %27 = sitofp i32 %26 to double
  %28 = add nsw i64 %indvars.iv, -1
  %29 = trunc nuw nsw i64 %28 to i32
  %30 = sitofp i32 %29 to double
  %31 = fmul double %30, %2
  %32 = tail call double @llvm.fmuladd.f64(double %27, double %1, double %31)
  %33 = fdiv double %32, %7
  %34 = getelementptr inbounds double, ptr %3, i64 %28
  store double %33, ptr %34, align 8, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %.loopexit, label %scalar.ph, !llvm.loop !13

.loopexit:                                        ; preds = %scalar.ph, %middle.block, %.preheader, %22
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <2 x double> @llvm.fmuladd.v2f64(<2 x double>, <2 x double>, <2 x double>) #2

attributes #0 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #1 = { 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" }
attributes #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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 = !{!"double", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/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: BDCEPass,CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass