random.pcg-vec: delete the vocab

The "vectorized" implementation is slower than the tuple-based one in the
random.pcg vocab, and it has extra memory load, see 4array in rot-state.

diff --git a/extra/random/pcg-vec/authors.txt b/extra/random/pcg-vec/authors.txt
deleted file mode 100644 (file)
index 8e1955f..0000000
--- a/extra/random/pcg-vec/authors.txt
+++ /dev/null
@@ -1 +0,0 @@
-Alexander Ilin

diff --git a/extra/random/pcg-vec/pcg-vec.factor b/extra/random/pcg-vec/pcg-vec.factor
deleted file mode 100644 (file)
index e122c94..0000000
--- a/extra/random/pcg-vec/pcg-vec.factor
+++ /dev/null
@@ -1,50 +0,0 @@
-! Copyright (C) 2022 Alexander Ilin.
-! See http://factorcode.org/license.txt for BSD license.
-USING: accessors alien.c-types arrays kernel math math.bitwise
-random sequences ;
-IN: random.pcg-vec
-
-! https://github.com/tkaitchuck/Mwc256XXA64/blob/main/impl/src/gen64.rs
-! https://www.pcg-random.org/
-
-! The state is an array of four u64 values in this order: x1, x2, x3, c.
-! Since we are only returning 32 bits per step of this 64-bit PRNG, the rest are
-! saved in the rem field.
-TUPLE: Mwc256XXA64 state rem ;
-
-<PRIVATE
-
-CONSTANT: MULTIPLIER 0xfeb3_4465_7c0a_f413
-
-: big>d/d ( n -- low high )
-    dup -64 shift [ 64 bits ] bi@ ; inline
-
-: multiply ( n -- low high )
-    MULTIPLIER * big>d/d ; inline
-
-: permute ( high x1 x2 x3 -- n )
-    [ bitxor ] 2bi@ W+ ; inline
-
-: rot-state ( obj x1 c -- obj' )
-    [ over state>> first2 ] dip 4array >>state ; inline
-
-: update-state ( obj low high -- )
-    [ over state>> last + big>d/d ] dip W+ rot-state drop ; inline
-
-: next-u64 ( obj -- n )
-    dup state>> third multiply [ pick state>> first3 permute ] keep
-    swap [ update-state ] dip ; inline
-
-! If cache is f, use quot to produce a new pair of values from obj: one to be
-! cached, and one to be used. Otherwise return cache as value and cache' = f.
-: cache ( obj cache/f quot: ( obj -- n1 n2 ) -- value cache' )
-    [ nip f ] swap if* ; inline
-
-PRIVATE>
-
-: <Mwc256XXA64> ( key1 key2 -- obj )
-    0xcafef00dd15ea5e5 0x14057B7EF767814F 4array f \ Mwc256XXA64 boa
-    6 [ dup next-u64 drop ] times ;
-
-M: Mwc256XXA64 random-32*
-    dup [ [ next-u64 d>w/w ] cache ] change-rem drop ;

diff --git a/extra/random/pcg-vec/tags.txt b/extra/random/pcg-vec/tags.txt
deleted file mode 100644 (file)
index fb5bea3..0000000
--- a/extra/random/pcg-vec/tags.txt
+++ /dev/null
@@ -1 +0,0 @@
-rng

diff --git a/extra/random/pcg/pcg.factor b/extra/random/pcg/pcg.factor
index e81e7068266b21dc920d4c7d3d8e122de6caa84a..43ae3f7eb06afdeb8ecd91699a6c1026f796849b 100644 (file)
--- a/extra/random/pcg/pcg.factor
+++ b/extra/random/pcg/pcg.factor
@@ -78,7 +78,6 @@ M: Mwc128XXA32 random-32*
 M: Mwc256XXA64 random-32*
     dup [ [ next-u64 d>w/w ] cache ] change-rem drop ;
 
-! USING: random random.pcg random.pcg-vec ;
+! USING: random random.pcg ;
 ! gc 0 0 random.pcg:<Mwc256XXA64> [ 10,000,000 [ dup random-32* drop ] times ] time drop
 ! gc 0 0 random.pcg:<Mwc128XXA32> [ 10,000,000 [ dup random-32* drop ] times ] time drop
-! gc 0 0 random.pcg-vec:<Mwc256XXA64> [ 10,000,000 [ dup random-32* drop ] times ] time drop