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Question regarding registers

Question asked by viscocoa on Feb 20, 2012
Latest reply on Feb 22, 2012 by viscocoa

What is the addressable unit of registers? A byte or a 4-byte integer/float, or a 16-byte vector?


If I declare a byte type private variable, will it occupy a 1-byte register, or 4-, or 16-byte register?


How are registers used by the ALU? In the following statements,


float4 x;

x.a = 1.f;                              // writing to the first element of x

float y = x.b + 2.f;                // reading the second element of x


can the last two instructions be excuted simultaneously?


Thank you in advance!