Re: [PATCH i386 3/8] [AVX512] [19/n] Add AVX-512 patterns: Extracts and converts.

[Richard Henderson]

On 10/16/2013 09:07 AM, Kirill Yukhin wrote:
> I suspect gen_lowpart is bad turn when reload is completed, as
> far as it can create new pseudo. gen_lowpart () may call
> gen_reg_rtx (), which contain corresponging gcc_assert ().

False.  gen_lowpart is perfectly safe post-reload.
Indeed, taking the subreg of a hard register should arrive

          x = gen_rtx_REG_offset (op, outermode, final_regno, final_offset);

in simplify_subreg.

Have you encountered some specific problem with gen_lowpart?


r~