; 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 double @r8vec_even2_select(i32 noundef %0, double noundef %1, double noundef %2, i32 noundef %3) #2 {
  %5 = alloca i32, align 4
  %6 = alloca double, align 8
  %7 = alloca double, align 8
  %8 = alloca i32, align 4
  %9 = alloca double, align 8
  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 i32 %3, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = mul nsw i32 2, %10
  %12 = load i32, ptr %8, align 4, !tbaa !5
  %13 = mul nsw i32 2, %12
  %14 = sub nsw i32 %11, %13
  %15 = add nsw i32 %14, 1
  %16 = sitofp i32 %15 to double
  %17 = load double, ptr %6, align 8, !tbaa !9
  %18 = load i32, ptr %8, align 4, !tbaa !5
  %19 = mul nsw i32 2, %18
  %20 = sub nsw i32 %19, 1
  %21 = sitofp i32 %20 to double
  %22 = load double, ptr %7, align 8, !tbaa !9
  %23 = fmul double %21, %22
  %24 = call double @llvm.fmuladd.f64(double %16, double %17, double %23)
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = mul nsw i32 2, %25
  %27 = sitofp i32 %26 to double
  %28 = fdiv double %24, %27
  store double %28, ptr %9, align 8, !tbaa !9
  %29 = load double, ptr %9, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  ret double %29
}

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}


; 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: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local double @r8vec_even2_select(i32 noundef %0, double noundef %1, double noundef %2, i32 noundef %3) local_unnamed_addr #1 {
  %5 = shl nsw i32 %0, 1
  %6 = shl nsw i32 %3, 1
  %7 = sub nsw i32 %5, %6
  %8 = or disjoint i32 %7, 1
  %9 = sitofp i32 %8 to double
  %10 = add nsw i32 %6, -1
  %11 = sitofp i32 %10 to double
  %12 = fmul double %11, %2
  %13 = tail call double @llvm.fmuladd.f64(double %9, double %1, double %12)
  %14 = sitofp i32 %5 to double
  %15 = fdiv double %13, %14
  ret double %15
}

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


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,TailCallElimPass