On Tue, Feb 24, 2015 at 2:56 PM, Andrew Haley wrote:
> On 02/24/2015 12:14 PM, Richard Biener wrote:
>> These concerns are correct. Btw, as an answer to Steve - within
>> -funsafe-math-optimizations FMA_EXPR basically can be either
>> fused or not fused (but yes, bad as to Josephs concern).
>> So
On 02/24/2015 12:14 PM, Richard Biener wrote:
> These concerns are correct. Btw, as an answer to Steve - within
> -funsafe-math-optimizations FMA_EXPR basically can be either
> fused or not fused (but yes, bad as to Josephs concern).
> So you could guard the pattern by flag_unsafe_math_optimizatio
On Mon, Feb 23, 2015 at 7:59 PM, Marc Glisse wrote:
> On Mon, 23 Feb 2015, Jeff Law wrote:
>
>> On 02/23/15 11:38, Joseph Myers wrote:
>>>
>>>
>>> (I wonder if convert_mult_to_fma is something that should move to
>>> match-and-simplify infrastructure.)
>>
>> Yea, it probably should.
>
>
> Currentl
On Mon, 23 Feb 2015, Jeff Law wrote:
On 02/23/15 11:38, Joseph Myers wrote:
(I wonder if convert_mult_to_fma is something that should move to
match-and-simplify infrastructure.)
Yea, it probably should.
Currently, it happens in a pass that is quite late. If it moves to
match-and-simplify,
On 02/23/15 11:38, Joseph Myers wrote:
(I wonder if convert_mult_to_fma is something that should move to
match-and-simplify infrastructure.)
Yea, it probably should.
Jeff
On Fri, 20 Feb 2015, Steve Ellcey wrote:
> Or one could change convert_mult_to_fma to add a check if fma is fused
> vs. non-fused in addition to the check for the flag_fp_contract_mode in
> order to decide whether to convert expressions into an fma and then
> define fma instructions in the md fil
On 02/23/15 10:42, Steve Ellcey wrote:
No, I am thinking about the case where there are only non-fused multiply
add instructions available. To make sure I am using the right
terminology, I am using a non-fused multiply-add to mean a single fma
instruction that does '(a + (b * c))' but which roun
On Sun, 2015-02-22 at 10:30 -0800, Matthew Fortune wrote:
> Steve Ellcey writes:
> > Or one could change convert_mult_to_fma to add a check if fma is fused
> > vs. non-fused in addition to the check for the flag_fp_contract_mode
> > in order to decide whether to convert expressions into an fma and
On 02/20/15 17:56, Steve Ellcey wrote:
I have a question about *unfused* fma instructions. MIPS has processors
with both fused and unfused multiple and add instructions and for fused
madd's it is clear what to do; define 'fma' instructions in the md file
and let convert_mult_to_fma decide wheth
Steve Ellcey writes:
> Or one could change convert_mult_to_fma to add a check if fma is fused
> vs. non-fused in addition to the check for the flag_fp_contract_mode
> in order to decide whether to convert expressions into an fma and then
> define fma instructions in the md file.
I was about to sa
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