Re:The R9 Fury is AMD’s best card in years, but just who is ...
by optimiz3 on Sunday July 26, 2015 @04:07PM
(#9952050)
Not true - AMD GCN also has bitselect, which does
dst = (A & B) | (~A & C).
This is equivalent to the SHA-256 Ch "Choose" function.
It also can be used to compose the SHA-256 Maj "Majority" function with an additional XOR.
Additionally, the AMD ISA doesn't have a "rotate" instruction per-se, BFI_INT is "bitfield insert", which can be used to compose arbitrary length rotates, but is not strictly a rotate in and of itself.
AMD ISA also has instructions for computing integer add with carry, which is great for crushing elliptic curves.
NVidia really, really, sucks for integer compute. Friends don't let friends buy NVidia!
dst = (A & B) | (~A & C).
This is equivalent to the SHA-256 Ch "Choose" function.
It also can be used to compose the SHA-256 Maj "Majority" function with an additional XOR.
Additionally, the AMD ISA doesn't have a "rotate" instruction per-se, BFI_INT is "bitfield insert", which can be used to compose arbitrary length rotates, but is not strictly a rotate in and of itself.
AMD ISA also has instructions for computing integer add with carry, which is great for crushing elliptic curves.
NVidia really, really, sucks for integer compute. Friends don't let friends buy NVidia!