Re: [committed] Enable LRA on several ports

[Hans-Peter Nilsson <hp@bitrange.com>]

On Mon, 1 May 2023, Jeff Law wrote:

> 
> Spurred by Segher's RFC, I went ahead and tested several ports with LRA
> enabled.  Not surprisingly, many failed, but a few built their full set of
> libraries successful and of those a few even ran their testsuites with no
> regressions.  In fact, enabling LRA fixes a small number of failures on the
> iq2000 port.
> 
> This patch converts the ports which built their libraries and have test
> results that are as good as or better than without LRA.    There may be minor
> code quality regressions or there may be minor code quality improvements --
> I'm leaving that for the port maintainers to own going forward.

How do you configure your builds?  Perhaps your cross-builds 
exclude C++?  I found that this (r14-383) broke MMIX building 
libstdc++-v3 from that commit up to and including r14-3180.
See commit r14-3187.

Thankfully there was just one single gotcha.  I temporarily 
reverted the LRA change for MMIX so that I can get honest 
repeatable baseline results.  There seems to have been one 
test-case regressing from the LRA switch (PR53948), thus I 
re-enabled LRA for MMIX again.  Sorry for the late reaction.

brgds, H-P