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Re: [PATCH] Add VIS intrinsics header for sparc.
On Sat, 24 Sep 2011, David Miller wrote:
> From: Hans-Peter Nilsson <hp@bitrange.com>
> Date: Sat, 24 Sep 2011 18:37:33 -0400 (EDT)
>
> > BTW, don't forget to clobber GSR at call insns!
>
> This I explicitly want to avoid and is an explicit design decision.
Aha, now I get it; that's certainly key. Thanks for taking the time.
Yes, it's certainly more flexible to have the user set GSR than
allowing gcc to clobber it when seeing VIS intrinsics, at the
minor usability cost of the user having to keep track of GSR
separately to when used in the individual intrinsics.
> Like I said the model is like setting the floating point rounding mode
> for a family of functions.
Aha 2: I didn't interpret what you wrote as referring to the
model; I thought you meant the actual function (one of the
usages of the fpack insns being "fixed math"). Sure.
> Zero is equivalent to "don't care" in this situation if either
> 1) you aren't doing any falignaddr operations or 2) you are
(JFTR, "faligndata")
> then going to subsequently do an "alignaddr" to set that field
> up.
brgds, H-P
PS. gcc-4.7/changes.html?