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implement sqrt

This commit is contained in:
~d6 2023-04-02 21:25:04 -04:00
parent 12fe55e61f
commit a22f9877fe
3 changed files with 23 additions and 1 deletions
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17
fix16.tal
View File

@ -258,6 +258,23 @@
&odd #0080
&rest ADD2 DUP EOR JMP2r
@x16-sqrt ( x* -> sqrt(x)* )
LIT2r ff00
LIT2r 0200 ( [c* 2*] )
DUP2 STH2kr x16-div ( x* s=x/2* [c* 2*] )
&loop ( x* s0* [c* 2*] )
OVR2 OVR2 x16-div ( x* s0* x/s0* [c* 2*] )
OVR2 x16-add ( x* s0* (x/s0)+s0* [c* 2*] )
STH2kr x16-div ( x* s0* s1=((x/s0)+s0)/2* [c* 2*] )
SWP2 OVR2 x16-ne ( x* s1* go^ [c* 2*] )
SWP2r INC2r ORAkr STHr ( x* s1* go^ ok^ [2* c+1*] )
SWP2r ?&continue ( x* s1* go^ [c+1* 2*] )
POP !&done ( x* s1* [c+1* 2*] )
&continue ( x* s1* go^ [c+1* 2*] )
?&loop ( x* s1* [c+1* 2*] )
&done ( x* s1* [c* 2*] )
POP2r POP2r NIP2 JMP2r ( s1* )
@x16-cos ( x* -> cos(x)* )
x16-pi/2 ADD2 ,x16-sin JMP

5
test-fix16.py
View File

@ -1,6 +1,6 @@
#!/usr/bin/python
from math import ceil, copysign, cos, floor, log, sin, tan
from math import ceil, copysign, cos, floor, log, sin, sqrt, tan
from os import environ
from random import randint
from subprocess import Popen, PIPE, run
@ -113,6 +113,8 @@ def x16_lteq(x, y):
return int(tosigned(x) <= tosigned(y))
def x16_gteq(x, y):
return int(tosigned(x) >= tosigned(y))
def x16_sqrt(x):
return int(sqrt(x / 256) * 256)
def x16_sin(x):
z = round(sin(x / 256) * 256)
return z if z >= 0 else 65536 + z
@ -162,6 +164,7 @@ def main():
test(p, trials, b'>', [('x', u16), ('y', u16)], u8, x16_gt)
test(p, trials, b'{', [('x', u16), ('y', u16)], u8, x16_lteq)
test(p, trials, b'}', [('x', u16), ('y', u16)], u8, x16_gteq)
test(p, trials, b'r', [('x', p16)], u16, x16_sqrt, eq=releq)
test(p, trials, b's', [('x', p16)], u16, x16_sin, eq=abseq)
test(p, trials, b'c', [('x', p16)], u16, x16_cos, eq=abseq)
test(p, trials, b't', [('x', t16)], u16, x16_tan, eq=taneq)

2
test-fix16.tal
View File

@ -64,6 +64,7 @@
;buf LDA LIT "> EQU ;test-x16-gt JCN2
;buf LDA LIT "{ EQU ;test-x16-lteq JCN2
;buf LDA LIT "} EQU ;test-x16-gteq JCN2
;buf LDA LIT "r EQU ;test-x16-sqrt JCN2
;buf LDA LIT "s EQU ;test-x16-sin JCN2
;buf LDA LIT "c EQU ;test-x16-cos JCN2
;buf LDA LIT "t EQU ;test-x16-tan JCN2
@ -113,6 +114,7 @@
@test-x16-lteq #04 #01 ;x16-lteq ;test JMP2
@test-x16-gt #04 #01 ;x16-gt ;test JMP2
@test-x16-gteq #04 #01 ;x16-gteq ;test JMP2
@test-x16-sqrt #02 #02 ;x16-sqrt ;test JMP2
@test-x16-sin #02 #02 ;x16-sin ;test JMP2
@test-x16-cos #02 #02 ;x16-cos ;test JMP2
@test-x16-tan #02 #02 ;x16-tan ;test JMP2