A books says that a register is abt 1KB.the books is trustworthy.But aren't they supposed to be 32-64 bits?
http://oi45.tinypic.com/24lpjt3.jpg
Inside the Machine: An Illustrated Introduction to Microprocessors and Computer Architecture
screen capture from the book
32-64 bits each. Altogether 1KB.
The x86_64 family of processors has got 16 general purpose 64 bit registers, making a total of 128 bytes. So 1kb does sound like rather a lot - although I can't claim to be familiar with the architecture of other processor families.
The only processor architecture I know of which has a register file that large is the UltraSPARC, which has (IIRC) 128 64-bit registers (divided into 8 overlapping register windows of 32 registers each).
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