Agner`s CPU blog

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Stop the instruction set war
Author: Agner Date: 2016-04-17 07:21
Ruslan wrote:
It seems it'd be quite OK to have a particular opcode mean one thing on a CPU supporting feature X and not Y, and another thing on a CPU supporting feature Y and not X if these features are from different vendors. Why the battle for opcode space then?
If features X and Y are both useful then somebody might want to support both on a later design. It is too expensive for the software industry to support different mutually incompatible microprocessors.
 
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