Re: [PATCH 1/2 v2] xtensa: Recover constant synthesis for HImode after LRA transition

[Max Filippov <jcmvbkbc@gmail.com>]

On Sun, Feb 4, 2024 at 2:20 AM Takayuki 'January June' Suwa
<jjsuwa_sys3175@yahoo.co.jp> wrote:
>
> After LRA transition, HImode constants that don't fit into signed 12 bits
> are no longer subject to constant synthesis:
>
>     /* example */
>     void test(void) {
>       short foo = 32767;
>       __asm__ ("" :: "r"(foo));
>     }
>
>     ;; before
>         .literal_position
>         .literal .LC0, 32767
>     test:
>         l32r    a9, .LC0
>         ret.n
>
> This patch fixes that:
>
>     ;; after
>     test:
>         movi.n  a9, -1
>         extui   a9, a9, 17, 15
>         ret.n
>
> gcc/ChangeLog:
>
>         * config/xtensa/xtensa.md (SHI): New mode iterator.
>         (2 split patterns related to constsynth):
>         Change to also accept HImode operands.
> ---
>  gcc/config/xtensa/xtensa.md | 22 ++++++++++++++--------
>  1 file changed, 14 insertions(+), 8 deletions(-)

Regtested for target=xtensa-linux-uclibc, no new regressions.
Committed to master.

-- 
Thanks.
-- Max