[PATCH] xtensa: Optimize stack frame adjustment more

[Takayuki 'January June' Suwa]

On 2023/01/06 17:05, Max Filippov wrote:
> On Thu, Jan 5, 2023 at 10:57 PM Takayuki 'January June' Suwa
> <jjsuwa_sys3175@yahoo.co.jp> wrote:
>> By using the helper function, it makes stack frame adjustment logic
>> simplified and instruction count less in some cases.
> 
> I've built a couple linux configurations with and without this change and
> I observe consistent code size growth, e.g.:
> 
> iss_defconfig without the change:
>   text    data     bss     dec     hex filename
> 3014768  164016  115108 3293892  3242c4 vmlinux
> 
> iss_defconfig with the change:
>   text    data     bss     dec     hex filename
> 3015296  164008  115108 3294412  3244cc vmlinux
> 
> virt_defconfig without the change:
>   text    data     bss     dec     hex filename
> 5498881 2254360  291768 8045009  7ac1d1 vmlinux
> 
> virt_defconfig with the change:
>   text    data     bss     dec     hex filename
> 5500389 2254360  291768 8046517  7ac7b5 vmlinux
> 
> generic_kc705_defconfig without the change:
>   text    data     bss     dec     hex filename
> 7062530  635340  286400 7984270  79d48e vmlinux
> 
> generic_kc705_defconfig with the change:
>   text    data     bss     dec     hex filename
> 7064078  635340  286400 7985818  79da9a vmlinux
> 

Probably due to this location:
> +  else if (TARGET_DENSITY && optimize_size && xtensa_simm12b (imm))
                             ^^^^^^^^^^^^^^^^
I omitted it in the new patch, so please check it.