From 9193769161e1f06b371eed99dfe9e90fec9a14a6 Mon Sep 17 00:00:00 2001
From: Emilio Jesus Gallego Arias
Date: Wed, 5 Feb 2020 17:46:07 +0100
Subject: [build] Consolidate stdlib's .v files under a single directory.

Currently, `.v` under the `Coq.` prefix are found in both `theories`
and `plugins`. Usually these two directories are merged by special
loadpath code that allows double-binding of the prefix.

This adds some complexity to the build and loadpath system; and in
particular, it prevents from handling the `Coq.*` prefix in the
simple, `-R theories Coq` standard way.

We thus move all `.v` files to theories, leaving `plugins` as an
OCaml-only directory, and modify accordingly the loadpath / build
infrastructure.

Note that in general `plugins/foo/Foo.v` was not self-contained, in
the sense that it depended on files in `theories` and files in
`theories` depended on it; moreover, Coq saw all these files as
belonging to the same namespace so it didn't really care where they
lived.

This could also imply a performance gain as we now effectively
traverse less directories when locating a library.

See also discussion in #10003
---
 theories/extraction/ExtrHaskellZNum.v | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 theories/extraction/ExtrHaskellZNum.v

(limited to 'theories/extraction/ExtrHaskellZNum.v')

diff --git a/theories/extraction/ExtrHaskellZNum.v b/theories/extraction/ExtrHaskellZNum.v
new file mode 100644
index 0000000000..4141bd203f
--- /dev/null
+++ b/theories/extraction/ExtrHaskellZNum.v
@@ -0,0 +1,23 @@
+(**
+ * Efficient (but uncertified) extraction of usual [Z] functions
+ * into equivalent versions in Haskell's Prelude that are defined
+ * for any [Num] typeclass instances.  Useful in combination with
+ * [Extract Inductive Z] that maps [Z] onto a Haskell type that
+ * implements [Num].
+ *)
+
+Require Coq.extraction.Extraction.
+
+Require Import ZArith.
+Require Import EqNat.
+
+Extract Inlined Constant Z.add => "(Prelude.+)".
+Extract Inlined Constant Z.sub => "(Prelude.-)".
+Extract Inlined Constant Z.mul => "(Prelude.*)".
+Extract Inlined Constant Z.max => "Prelude.max".
+Extract Inlined Constant Z.min => "Prelude.min".
+Extract Inlined Constant Z_ge_lt_dec => "(Prelude.>=)".
+Extract Inlined Constant Z_gt_le_dec => "(Prelude.>)".
+
+Extract Constant Z.div => "(\n m -> if m Prelude.== 0 then 0 else Prelude.div n m)".
+Extract Constant Z.modulo => "(\n m -> if m Prelude.== 0 then 0 else Prelude.mod n m)".
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