Re: [PATH][GCC][mid-end] Check the alternate cost model just as costs_lt_p

[Jeff Law]

On 05/02/2017 08:34 AM, Tamar Christina wrote:

Hi all,

When comparing costs, the rtl function costs_lt_p compares the costs of
A and B such that if they are the same and we were checking for speed,
compare the size and use that as determining factor.

This applies the same principle to the comparison done for the costing
of expr expansions. Potentially makes -Osize code faster and -Ospeed code
smaller.

Bootstrapped on aarch64-none-linux-gnu and x86_64-linux
and reg-tested on aarch64-none-linux-gnu with no regressions.

OK for trunk?

Thanks,
Tamar


gcc/
2017-04-26  Tamar Christina  <tamar.christ...@arm.com>

        * expr.c (expand_expr_real_2): Re-cost if previous costs are the same.

OK
jeff