; LLVM IR from NOAA-PMEL/Ferret :: fmt/src (switch_nan)

; 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 void @switch_nan_(ptr noundef %0, ptr noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store ptr %2, ptr %6, align 8, !tbaa !5
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = load float, ptr %7, align 4, !tbaa !9
  %9 = call i1 @llvm.is.fpclass.f32(float %8, i32 3)
  br i1 %9, label %14, label %10

10:                                               ; preds = %3
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = load float, ptr %11, align 4, !tbaa !9
  %13 = call i1 @llvm.is.fpclass.f32(float %12, i32 3)
  br i1 %13, label %14, label %26

14:                                               ; preds = %10, %3
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = load float, ptr %15, align 4, !tbaa !9
  %17 = call i1 @llvm.is.fpclass.f32(float %16, i32 3)
  br i1 %17, label %18, label %25

18:                                               ; preds = %14
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = load float, ptr %19, align 4, !tbaa !9
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  store float %20, ptr %21, align 4, !tbaa !9
  %22 = load ptr, ptr %6, align 8, !tbaa !5
  %23 = load float, ptr %22, align 4, !tbaa !9
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  store float %23, ptr %24, align 4, !tbaa !9
  br label %25

25:                                               ; preds = %18, %14
  br label %26

26:                                               ; preds = %25, %10
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i1 @llvm.is.fpclass.f32(float, i32 immarg) #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 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"float", !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 nofree norecurse nosync nounwind willreturn memory(argmem: readwrite) uwtable
define dso_local void @switch_nan_(ptr nocapture noundef %0, ptr nocapture noundef writeonly %1, ptr nocapture noundef readonly %2) local_unnamed_addr #0 {
  %4 = load float, ptr %0, align 4, !tbaa !5
  %5 = fcmp uno float %4, 0.000000e+00
  br i1 %5, label %6, label %8

6:                                                ; preds = %3
  store float %4, ptr %1, align 4, !tbaa !5
  %7 = load float, ptr %2, align 4, !tbaa !5
  store float %7, ptr %0, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %3, %6
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: 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" }

!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/C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass