On Mon, Jun 4, 2012 at 1:44 AM, Richard Sandiford
wrote:
> Klaus Pedersen writes:
[...]
>> My original fix, that use sane cost for the ACC_REGS: gpr_acc_cost_3.patch
>
> Why sane? Transfers from and (especially) to HI and LO really are
> expensive on many processors. Obviously it'd be nice at s
Klaus Pedersen writes:
> On Tue, May 29, 2012 at 6:55 AM, Vladimir Makarov wrote:
>> On 05/28/2012 03:09 PM, Richard Sandiford wrote:
>>>
>>> Klaus Pedersen writes:
The summery goes something like this:
It is possible for the second pass of ira to get confused and decide that
On Tue, May 29, 2012 at 6:55 AM, Vladimir Makarov wrote:
> On 05/28/2012 03:09 PM, Richard Sandiford wrote:
>>
>> Klaus Pedersen writes:
>>>
>>> The summery goes something like this:
>>>
>>> It is possible for the second pass of ira to get confused and decide that
>>> NO_REGS or a hard float regi
On 05/30/2012 10:27 PM, Klaus Pedersen wrote:
Thanks for the pointer,
On Wed, May 30, 2012 at 2:40 AM, Vladimir Makarov wrote:
Here is an extract from my article from GCC Summit 2004 proceedings.
It is interesting to note that the pass also implicitly does code
selection. Regclass works in
Thanks for the pointer,
On Wed, May 30, 2012 at 2:40 AM, Vladimir Makarov wrote:
> Here is an extract from my article from GCC Summit 2004 proceedings.
>
> It is interesting to note that the pass also implicitly does code
> selection. Regclass works in two passes. On the first pass, it
> defin
On 05/29/2012 02:33 AM, Richard Sandiford wrote:
Hi Vlad,
Thanks for the answer.
Vladimir Makarov writes:
On 05/28/2012 03:09 PM, Richard Sandiford wrote:
Or is it a conceptual part of the algorithm?
No.
More generally,
what kind of situations does the second pass help with?
I can
Hi Vlad,
Thanks for the answer.
Vladimir Makarov writes:
> On 05/28/2012 03:09 PM, Richard Sandiford wrote:
>>Or is it a conceptual part of the algorithm?
> No.
>>More generally,
>> what kind of situations does the second pass help with?
> I can not show such situations right now but I d
On 05/28/2012 03:09 PM, Richard Sandiford wrote:
Klaus Pedersen writes:
The summery goes something like this:
It is possible for the second pass of ira to get confused and decide that
NO_REGS or a hard float register are better choices for the result of the
2 operand mult. First pass already o
Klaus Pedersen writes:
> The summery goes something like this:
>
> It is possible for the second pass of ira to get confused and decide that
> NO_REGS or a hard float register are better choices for the result of the
> 2 operand mult. First pass already optimally allocated in GR_AND_MD1_REGS.
Yea
The summery goes something like this:
It is possible for the second pass of ira to get confused and decide that
NO_REGS or a hard float register are better choices for the result of the
2 operand mult. First pass already optimally allocated in GR_AND_MD1_REGS.
Two pass ira is enabled with "-fexpe
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