> Richard Henderson wrote:
> On 08/12/2015 08:59 AM, Wilco Dijkstra wrote:
> > I looked at the statistics of AArch64 immediate generation a while ago.
> > The interesting thing is ~95% of calls are queries, and the same query is on
> > average repeated 10 times in a row. So (a) it is not important
On Wed, Aug 12, 2015 at 11:10 PM, Segher Boessenkool
wrote:
> On Wed, Aug 12, 2015 at 03:31:48AM -0500, Segher Boessenkool wrote:
>> > * This is the only platform for which I bothered collecting any sort
>> > of performance data:
>> >
>> > As best I can tell, there is a 9% improvement in
On Wed, Aug 12, 2015 at 04:59:27PM +0100, Wilco Dijkstra wrote:
> However it also creates new dependencies that may not be desirable
> (such as hash table size, algorithm used etc).
>
> > Some notes about ppc64 in particular:
> >
> > * Constants aren't split until quite late, preventing all hop
On Wed, Aug 12, 2015 at 03:31:48AM -0500, Segher Boessenkool wrote:
> > * This is the only platform for which I bothered collecting any sort
> > of performance data:
> >
> > As best I can tell, there is a 9% improvement in bootstrap speed
> > for ppc64. That is, 10 minutes off the o
On Wed, Aug 12, 2015 at 08:32:46AM -0700, Richard Henderson wrote:
> On 08/12/2015 01:31 AM, Segher Boessenkool wrote:
> > Is there something that makes the cache not get too big? Do we
> > care, anyway?
>
> No, nothing ever reduces the size of the cache. I doubt we care, but I
> haven't
> inst
On 08/12/2015 08:59 AM, Wilco Dijkstra wrote:
> I looked at the statistics of AArch64 immediate generation a while ago.
> The interesting thing is ~95% of calls are queries, and the same query is on
> average repeated 10 times in a row. So (a) it is not important to cache the
> expansions, and (
Richard Henderson wrote:
> However, the way that aarch64 and alpha have done it hasn't
> been ideal, in that there's a fairly costly search that must
> be done every time. I've thought before about changing this
> so that we would be able to cache results, akin to how we do
> it in expmed.c for mu
On 08/12/2015 01:32 AM, Richard Earnshaw wrote:
> How do we clear the cache, and when? For example, on ARM, switching
> between ARM and Thumb state means we need to generate potentially
> radically different sequences? We can do such splitting at function
> boundaries now.
At present I never cle
On 08/12/2015 01:31 AM, Segher Boessenkool wrote:
> Is there something that makes the cache not get too big? Do we
> care, anyway?
No, nothing ever reduces the size of the cache. I doubt we care, but I haven't
instrumented to see how big it grows.
My intuition says the most important thing abou
On 12/08/15 09:43, Richard Earnshaw wrote:
> On 12/08/15 09:32, Richard Earnshaw wrote:
>> On 12/08/15 02:11, Richard Henderson wrote:
>>> I'm somewhat surprised that the operands to the logicals aren't
>>> visible at rtl generation time, given all the work done in gimple.
>>> And faili
On 12/08/15 09:32, Richard Earnshaw wrote:
> On 12/08/15 02:11, Richard Henderson wrote:
>> Something last week had me looking at ppc64 code generation,
>> and some of what I saw was fairly bad. Fixing it wasn't going
>> to be easy, due to the fact that the logic for generating
>> constants wasn't
On 12/08/15 02:11, Richard Henderson wrote:
> Something last week had me looking at ppc64 code generation,
> and some of what I saw was fairly bad. Fixing it wasn't going
> to be easy, due to the fact that the logic for generating
> constants wasn't contained within a single function.
>
> Better
Hi!
This looks really nice. I'll try it out soon :-)
Some comments now...
On Tue, Aug 11, 2015 at 06:11:29PM -0700, Richard Henderson wrote:
> However, the way that aarch64 and alpha have done it hasn't
> been ideal, in that there's a fairly costly search that must
> be done every time. I've
Something last week had me looking at ppc64 code generation,
and some of what I saw was fairly bad. Fixing it wasn't going
to be easy, due to the fact that the logic for generating
constants wasn't contained within a single function.
Better is the way that aarch64 and alpha have done it in the
pa
14 matches
Mail list logo
