* [patch][ping #2] Fix PR80929: Realistic PARALLEL cost in seq_cost.
@ 2017-06-18 19:40 Georg-Johann Lay
0 siblings, 0 replies; only message in thread
From: Georg-Johann Lay @ 2017-06-18 19:40 UTC (permalink / raw)
To: gcc-patches
Ping #2
https://gcc.gnu.org/ml/gcc-patches/2017-06/msg00096.html
On 02.06.2017 09:53, Georg-Johann Lay wrote:
> Hi,
>
> this small addition improves costs of PARALLELs in
> rtlanal.c:seq_cost(). Up to now, these costs are
> assumed to be 1 which gives gross inexact costs for,
> e.g. divmod which is represented as PARALLEL.
>
> The patch just forwards cost computation to insn_rtx_cost
> which uses the cost of the 1st SET (if any) and otherwise
> assign costs of 1 insn.
>
> Bootstrapped & regtested on x86_64.
>
> Moreover, it fixed the division by constant on avr where
> the problem popped up since PR79665.
>
> Ok to install?
>
> Johann
>
> gcc/
> PR middle-end/80929
> * rtlanal.c (seq_cost) [PARALLEL]: Get cost from insn_rtx_cost
> instead of assuming cost of 1.
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2017-06-18 19:40 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-06-18 19:40 [patch][ping #2] Fix PR80929: Realistic PARALLEL cost in seq_cost Georg-Johann Lay
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).