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Re: [PR65768] Check rtx_cost when propagating constant


ping?

Thanks,
Kugan

On 15/04/15 17:53, Kugan wrote:
> As mentioned in PR65768, ARM gcc generates suboptimal code for constant
> Uses in loop. Part of the reason is cprop is undoing what loop invariant
> code motion did.
> 
> Zhenqiang posted a patch at to fix this based on rtx costs:
> https://gcc.gnu.org/ml/gcc-patches/2014-06/msg01321.html
> 
> I cleaned it up and bootstrapped, regression tested on x86_64-linux-gnu;
> no new regressions. Is this OK for trunk?
> 
> Thanks,
> Kugan
> 
> gcc/ChangeLog:
> 
> 2015-04-15  Kugan Vivekanandarajah  <kuganv@linaro.org>
> 	    Zhenqiang Chen  <zhenqiang.chen@linaro.org>
> 
> 	PR target/65768
> 	* cprop.c (try_replace_reg): Check cost of constants before propagating.
> 


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