This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
Re: [committed] [2/3] Converting the v850 port away from cc0 -- basic support for new scheme
- From: Jeff Law <law at redhat dot com>
- To: Eric Botcazou <ebotcazou at adacore dot com>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Thu, 28 Jun 2018 08:02:36 -0600
- Subject: Re: [committed] [2/3] Converting the v850 port away from cc0 -- basic support for new scheme
- References: <90e9cdf4-9ddd-a3fd-6d5d-75bec16b9ab5@redhat.com> <3177674.cscqQlKH6W@polaris>
On 06/28/2018 05:20 AM, Eric Botcazou wrote:
>> This is the bulk of the changes. With this change in installed the v850
>> port should be using the new mechanism for condition code handling
>> consistently, though without optimizing well.
>
> Nice work! You need to update the v850 entry in:
> https://gcc.gnu.org/backends.html
It's on my list :-)
>
>> One of the interesting v8 tidbits is that it was already using the new
>> style for its floating point comparisons & branches. We actually get to
>> simplify that a bit because we no longer need special branching patterns
>> (FP comparison initially are stored in FCC, then get copied into the Z
>> bit of CC_REG, then we use standard bz/bnz insns).
>
> Does this mean that the 'F' in the above document is also obsolete?
Yea, not sure how we got into the inconsistent state, but modern
versions of the v850 have a FP unit or at least it's an option.
jeff