[PATCH] print-rtx.c: add 'h', v' and 'p' prefixes to regnos

[Bernd Schmidt]

On 09/28/2016 06:23 PM, Jeff Law wrote:

>>>   (reg/i:SI h0 ax)
>>>   (reg/i:SF h21 xmm0)
>>
>> (Replying to myself, in the hope of better demonstrating the idea)
>>
>> The following patch implements this idea for RTL dumps, so that all REGNO
>> values in dumps get a one character prefix: 'h' for hard registers, 'v'
>> for virtual registers, and 'p' for non-virtual pseudos (making it easier
>> for both humans and parsers to grok the meaning of a REGNO).
> I think you nailed it.  h, v & p prefixing for each of the register
> types, but leaving the actual register number as-is in the dump file.
>
I'm actually no longer quite so sure this buys us much: a port might 
have an actual register named "h0", leading to confusion. Virtual and 
hard registers also already have their real name printed after the number.

A "p" prefix for pseudos might still be a good idea, but there's still 
the issue of a real "p0" register name causing confusion.


Bernd