[parisc-linux] Conditional Execution and Instruction Nullification

[parisc-linux] Conditional Execution and Instruction Nullification

[Stuart Brady]

On Sat, Jan 28, 2006 at 05:10:57PM +0000, Joel Soete wrote:
> Ah ok sorry, I was confused by a colleague of mine experimented in other 
> cpu risc who tell me that 'instrucion nullification' was typicaly RISC, 
> though. (I can just try to ask him more details on cpu arch he spoke about)

Ignoring conditional traps/branches (and hoping I've got this right):

Neither Alpha nor PowerPC have conditional execution.  MIPS and SPARC
have conditional move instructions (as does POWER).  ARM has conditional
execution for most instructions.  PA-RISC has instruction nullification.

SPARC does have delay slot nullification (with confusing semantics), but
that's unrelated.  MIPS (since MIPS II) and PA-RISC have this, too.

http://gec.di.uminho.pt/discip/TextoAC/AnexoE.html might be a good read.

Cheers,
-- 
Stuart Brady
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