[PATCH] Use fixed_nonglobal_reg_set to deduce ok_regs (PR rtl-optimization/79728)

[Jeff Law]

On 03/06/2017 01:27 AM, Xi Ruoyao wrote:
> Hi,
>
> After Bernd fixed PR44281 (r235809), the registers fixed only because
> they are global can be selected by IRA. However, since they are not
> in ok_regs, the move cost estimation about them are wrong. Then an
> assertion in ira.c failed and then ICE.
>
> To fix this, add these registers into ok_regs.
>
> Bootstrapped/regtested on x86_64-linux-gnu. Is this ok for trunk?
>
> 2017-03-06  Xi Ruoyao  <ryxi@stu.xidian.edu.cn>
>
> 	PR rtl-optimization/79728
> 	* reginfo.c (init_reg_sets_1): Use fixed_nonglobal_reg_set
> 	(instead of fixed_regs) to deduce ok_regs.
>
> 	* gcc.target/i386/pr79728.c: New test.
I think I prefer Bernd's patch, mostly because it preserves the old 
meaning of the code for reload.

jeff