diff options
| author | Pierre Roux | 2019-09-12 19:02:18 +0200 |
|---|---|---|
| committer | Pierre Roux | 2019-11-01 10:21:07 +0100 |
| commit | a2ba4016a64f84193261db9a52196adc39cb5767 (patch) | |
| tree | f8f0facb4d8c99d8bc5f6db34d6b97a58c8216ca /kernel/nativevalues.ml | |
| parent | dca0135a263717b3a1a1d7c4f054f039dc08109e (diff) | |
Reimplement is_float
is_float was relying on Obj.tag triggering a check that we are in the
OCaml heap which is expensive. On extreme examples, this can lead to a
global 2x speedup.
Thanks to Maxime Dénès and Jacques-Henri Jourdan for their help in
diagnosing this.
Diffstat (limited to 'kernel/nativevalues.ml')
| -rw-r--r-- | kernel/nativevalues.ml | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/kernel/nativevalues.ml b/kernel/nativevalues.ml index 1d4fb5d39c..6b9d49052d 100644 --- a/kernel/nativevalues.ml +++ b/kernel/nativevalues.ml @@ -517,10 +517,8 @@ let print x = (** Support for machine floating point values *) -let is_float (x:t) = - let o = Obj.repr x in - Int.equal (Obj.tag o) Obj.double_tag -[@@ocaml.inline always] +external is_float : t -> bool = "coq_is_double" +[@@noalloc] let to_float (x:t) = (Obj.magic x : Float64.t) [@@ocaml.inline always] |