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ExtrOcamlZBigInt: Use shifts/masks to build and match positive values #281

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ExtrOcamlZBigInt: Use shifts/masks to build and match positive values #281

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10 changes: 6 additions & 4 deletions theories/extraction/ExtrOcamlZBigInt.v
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Original file line number Diff line number Diff line change
Expand Up @@ -27,12 +27,14 @@ Extraction Blacklist Z Big_int_Z.
emulate the matching, see documentation of [Extract Inductive]. *)

Extract Inductive positive => "Big_int_Z.big_int"
[ "(fun x -> Big_int_Z.succ_big_int (Big_int_Z.mult_int_big_int 2 x))"
"Big_int_Z.mult_int_big_int 2" "Big_int_Z.unit_big_int" ]
[ "(fun p -> Big_int_Z.succ_big_int (Big_int_Z.shift_left_big_int p 1))"
"(fun p -> Big_int_Z.shift_left_big_int p 1)" "Big_int_Z.unit_big_int" ]
"(fun f2p1 f2p f1 p ->
if Big_int_Z.le_big_int p Big_int_Z.unit_big_int then f1 () else
let (q,r) = Big_int_Z.quomod_big_int p (Big_int_Z.big_int_of_int 2) in
if Big_int_Z.eq_big_int r Big_int_Z.zero_big_int then f2p q else f2p1 q)".
let q = Big_int_Z.shift_right_big_int p 1 in
if Big_int_Z.eq_big_int (Big_int_Z.and_big_int p Big_int_Z.unit_big_int)
Big_int_Z.unit_big_int
then f2p1 q else f2p q)".

Extract Inductive Z => "Big_int_Z.big_int"
[ "Big_int_Z.zero_big_int" "" "Big_int_Z.minus_big_int" ]
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