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cc65/libsrc
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Brad Smith 041f981960
rand() use XOR to break up unwanted pair correlation (#1107) 
* rand() use XOR to break up unwanted pair correlation

This form of rand() cannot return the same value twice in a row.
Two additonal EOR instructions produce a more even distribution of successive pairs.
see comments on #951

* rand.s document purpose of XOR

* suggested srand() optimization: zero fill unnecessary

* test to validate implementation of rand()

* srand() improving behaviour and adding startup test

* srand() with a tail call to rand() for better initial shuffle

* srand() can fall through to rand() instead of tail call
2020-07-21 23:38:18 +02:00
..
apple2 Implemented some CONIO peek functions. 2020-07-12 22:19:55 +02:00
atari Split libref.s into multiple files to prevent inclusion of unnecessary code. 2020-06-04 23:24:24 +02:00
atari2600 ctype size optimization 2020-02-03 20:45:09 +01:00
atari5200
atmos Shortened names and adjusted style. 2020-04-02 22:58:16 +02:00
c16 Update status.s 2019-11-20 12:54:47 +01:00
c64 Removed executable bit. 2020-07-12 23:11:43 +02:00
c128 Stopped the C128 mouse drivers from blocking certain keys such as '1', '2', and 'Q'. 2020-07-14 16:06:21 -04:00
cbm Shortened names and adjusted style. 2020-04-02 22:58:16 +02:00
cbm510 Removed executable bit. 2020-07-12 23:11:43 +02:00
cbm610 Fix handling of charcodes 254 and 255, fixes issue #988 2020-07-08 00:48:39 +02:00
common rand() use XOR to break up unwanted pair correlation (#1107) 2020-07-21 23:38:18 +02:00
conio
creativision Changes resulting from 2nd code review 2020-02-03 20:45:09 +01:00
cx16 Added a 320x200x256 TGI driver to the Commander X16 library. 2020-07-15 17:30:58 -04:00
dbg Removed unnecessary #include <cc65.h> from convert.c 2019-11-19 14:08:00 +01:00
em
gamate Changes resulting from 2nd code review 2020-02-03 20:45:09 +01:00
geos-apple Removed unnecessary #include <cc65.h> from convert.c 2019-11-19 14:08:00 +01:00
geos-cbm
geos-common Shortened names and adjusted style. 2020-04-02 22:58:16 +02:00
joystick
lynx Some style adjustments. 2020-04-02 10:42:06 +02:00
mouse
nes Preserve the accu 2020-04-06 18:13:54 +02:00
none ctype size optimization 2020-02-03 20:45:09 +01:00
osic1p ctype size optimization 2020-02-03 20:45:09 +01:00
pce Moved the font into a separate module in the library. 2020-07-15 04:58:32 -04:00
pet
plus4 Fix handling of charcodes 254 and 255, fixes issue #988 2020-07-08 00:48:39 +02:00
runtime Optimize sign extension. 2019-11-07 21:45:19 +01:00
serial
sim6502 ctype size optimization 2020-02-03 20:45:09 +01:00
supervision ctype size optimization 2020-02-03 20:45:09 +01:00
telestrat Fixed the name of the driver 2020-05-28 08:50:20 -04:00
tgi Allowed the TGI API to support 256 colors. 2020-06-04 12:58:05 -04:00
vic20 Another code style fix 2020-07-14 22:54:03 -04:00
zlib
Makefile