So I'm afraid I'm not going to get involved in a discussion about
CANNOT_CHANGE_MODE_CLASS on RS6000, and what you might want to do there - sorry,
but I don't think I can really contribute anything there. However, I *am* trying
to migrate all platforms off the old reduc_xxx optabs to the new
Sorry - it works exactly as the current optab/expander *in the v2df case*, but
is the same as the previous version of the patch in the other cases.
--Alan
Alan Lawrence wrote:
So I'm afraid I'm not going to get involved in a discussion about
CANNOT_CHANGE_MODE_CLASS on RS6000, and what you
On Tue, Nov 11, 2014 at 08:27:22PM -0500, Michael Meissner wrote:
Before the patch, the final reduction used *vsx_reduc_splus_v2df; after
the patch, it is *vsx_reduc_plus_v2df_scalar. The former does a vector
add, the latter a float add. And it uses the same pseudoregister for the
So I'm no expert on RS6000 here, but following on from Segher's observation
about the change in pattern...so the difference in 'expand' is exactly that, a
vsx_reduc_splus_v2df followed by a vec_extract to DF, becomes a
vsx_reduc_splus_v2df_scalar - as I expected the combiner to produce by
Have run check-gcc on gcc110.fsffrance.org (powerpc64-unknown-linux-gnu) using
this snippet on top of original patch; no regressions.
Alan Lawrence wrote:
So I'm no expert on RS6000 here, but following on from Segher's observation
about the change in pattern...so the difference in 'expand' is
On Wed, Nov 12, 2014 at 03:26:35AM -0600, Segher Boessenkool wrote:
On Tue, Nov 11, 2014 at 08:27:22PM -0500, Michael Meissner wrote:
Before the patch, the final reduction used *vsx_reduc_splus_v2df; after
the patch, it is *vsx_reduc_plus_v2df_scalar. The former does a vector
add, the
On Tue, Nov 11, 2014 at 01:10:01AM -0600, Segher Boessenkool wrote:
On Mon, Nov 10, 2014 at 05:36:24PM -0500, Michael Meissner wrote:
However, the double pattern is completely broken. This cannot go in.
[snip]
It is unacceptable to have to do the inner loop doing a load, vector add,
On Fri, Oct 24, 2014 at 01:06:41PM +0100, Alan Lawrence wrote:
This migrates the reduction patterns in altivec.md and vector.md to
the new names. I've not touched paired.md as I wasn't really sure
how to fix that (how do I vec_extractv2sf ?), moreover the testing I
did didn't seem to exercise
On Mon, Nov 10, 2014 at 05:36:24PM -0500, Michael Meissner wrote:
However, the double pattern is completely broken. This cannot go in.
[snip]
It is unacceptable to have to do the inner loop doing a load, vector add, and
store in the loop.
Before the patch, the final reduction used
Ah I see now! Thank you for explaining that bit, I was a bit puzzled when I saw
it, but it makes sense now!
Cheers, Alan
Bill Schmidt wrote:
On Thu, 2014-11-06 at 16:44 +, Alan Lawrence wrote:
Hmmm. I am a little surprised by your mention of saturation points as I would
not expect any
Hmmm. I am a little surprised by your mention of saturation points as I would
not expect any variety of reduc_plus to be a saturating operation???
A.
Bill Schmidt wrote:
On Fri, 2014-10-24 at 19:49 -0400, David Edelsohn wrote:
On Fri, Oct 24, 2014 at 8:06 AM, Alan Lawrence
On Thu, 2014-11-06 at 16:44 +, Alan Lawrence wrote:
Hmmm. I am a little surprised by your mention of saturation points as I
would
not expect any variety of reduc_plus to be a saturating operation???
I wouldn't either, but the underlying vsum4ubs and vsum4sbs instructions
used in these
On Fri, 2014-10-24 at 19:49 -0400, David Edelsohn wrote:
On Fri, Oct 24, 2014 at 8:06 AM, Alan Lawrence alan.lawre...@arm.com wrote:
This migrates the reduction patterns in altivec.md and vector.md to the new
names. I've not touched paired.md as I wasn't really sure how to fix that
(how do
This migrates the reduction patterns in altivec.md and vector.md to the new
names. I've not touched paired.md as I wasn't really sure how to fix that (how
do I vec_extractv2sf ?), moreover the testing I did didn't seem to exercise any
of those patterns (iow: I'm not sure what would be an
Ooops, attached.commit e48d59399722ce8316d4b1b4f28b40d87b1193fa
Author: Alan Lawrence alan.lawre...@arm.com
Date: Tue Oct 7 15:28:47 2014 +0100
PowerPC v2 (but not paired.md)
diff --git a/gcc/config/rs6000/altivec.md b/gcc/config/rs6000/altivec.md
index 02ea142..92bb5d0 100644
---
On Fri, Oct 24, 2014 at 8:06 AM, Alan Lawrence alan.lawre...@arm.com wrote:
This migrates the reduction patterns in altivec.md and vector.md to the new
names. I've not touched paired.md as I wasn't really sure how to fix that
(how do I vec_extractv2sf ?), moreover the testing I did didn't seem
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