[AArch64] Use scvtf fbits option where appropriate

[Joel Hutton]

On 18/06/2019 11:37, Richard Earnshaw (lists) wrote:
> Start sentences with a capital letter.  End them with a full stop.
> "inequal" isn't a word: you probably mean "unequal".

I've fixed this, the iterator is, however defined as 'fcvt_iesize'
and described in the adjacent comment in iterators.md as 'inequal'.
I've addressed your other comments.

On 18/06/2019 13:30, Richard Sandiford wrote:
> Wilco Dijkstra <Wilco.Dijkstra@arm.com> writes:
>>   > +/* If X is a positive CONST_DOUBLE with a value that is the 
>> reciprocal of a
>>   > +   power of 2 (i.e 1/2^n) return the number of float bits. e.g. 
>> for x==(1/2^n)
>>   > +   return n. Otherwise return -1.  */
>>   > +int
>>   > +aarch64_fpconst_pow2_recip (rtx x)
>>   > +{
>>   > +  REAL_VALUE_TYPE r0;
>>   > +
>>   > +  if (!CONST_DOUBLE_P (x))
>>   > +    return -1;
>>> CONST_DOUBLE can be used for things other than floating point.  You
>>> should really check that the mode on the double in is in class 
>>> MODE_FLOAT.
>>   Several other functions (eg aarch64_fpconst_pow_of_2) do the same 
>> since
>> this function is only called with HF/SF/DF mode. We could add an 
>> assert for
>> SCALAR_FLOAT_MODE_P (but then aarch64_fpconst_pow_of_2 should do
>> the same).
> IMO we should leave it as-is.  aarch64.h has:
I've gone with the majority and left it as-is, but I don't have strong 
feelings on it.
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