On 01/07/2015 12:39 AM, Eric Botcazou wrote:
Some ports are missing (lm32, moxie, nios2, nvptx, rl78, rx) so the relevant
maintainers are CCed (see 6.3.9 Anatomy of a Target Back End in the doc).
The page is directly browsable at https://gcc.gnu.org/backends.html
For the moxie, nvptx, rl178 and rx ports, maintainers can send me the string
as Sandra did for the nios2 port and I'll update the document.
For nvptx it's not really clear what to use in some cases, and in others
I have no idea why we would need to keep track of these "characteristics".
H - you could argue a hardware implementation does not exist as it's a
virtual target, but it can obviously be compiled down to run on
hardware that does exist.
Q - "registers" are typed and you can declare 64 bit registers, so
probably this is true
f - Not even sure what this is about. It only defines a small epilogue
pattern.
a - Port uses neither LRA nor reload. Might be a new characteristic
(along with several others).
The closest string is probably
SQCqfbde
Bernd
