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Re: [PATCH][rs6000] Support for PowerPC 750CL paired-single instructions
On Tue, Aug 28, 2007 at 08:50:34AM -0400, David Edelsohn wrote:
> Paired single is not part of the PowerPC UISA nor a standard
> extension or optional feature. I wish to avoid slowing down the compiler
> for additional instrictions that most users will never access.
At the same time, this makes it much harder to get at those
instructions. Scenario 1: Dan wants to check the behavior of -mpaired
with his patch. He has to build a whole different compiler to find
out. Scenario 2: Bob wants to see if using -mpaired would make a
difference to his code. He has to go find a whole different build of
GCC to try it.
The MIPS approach is much more convenient for me than the PowerPC /
SPE approach. Just for the record...
--
Daniel Jacobowitz
CodeSourcery