OpenEuphoria

Re: Precedence testing

• Posted by Spock Oct 22, 2020
• 1232 views

&& - bitwise and, same as and_bits(lhs,rhs) 
|| - bitwise or, same as or_bits(lhs,rhs) 
>> - shift right, same as floor(lhs/power(2,rhs)) 
<< - shift left, same as lhs*power(2,rhs) 
~ - same as length(rhs) [unary] 
. - subscripts and/or struct/class members 

This might tempt me to drop Eu 2010 in favour of Phix 2020. What about about !! and ^^ for not_bits() & xor_bits() ? Presumably the equivalent assignment operators will be there as well. For c2ypt0 apps perhaps >>> and <<<? Mind you, a decent integrated assembler would make such bit-twiddling tricks redundant. I have about 90 ASM fragments in my base library to speed up various graphics functions. I use fasm4e but the calling overhead dominates for small functions. Eg, the following ASM code is only about 30% faster than Eu.

"mov eax, rgb", 
"bswap eax", 
"shr eax, 8", 
"ret eax" 

[Orac code follows] 
 
-- Use for when a colour value is BGR but you need to convert it to RGB (or vice versa) 
int b = (rgb && #FF) * 65536 
int g = rgb && #FF00 
int r = floor((rgb && #FF0000)/65536) 
return b || g || r 

How does Phix compare for context switching?

Spock