[Bug target/105069] [12 regression] sh-elf internal compiler errors and test failures with -Os

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105069

--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #6)
> While changing mdiv= from accepting a string to Enum(something) might be
> worth it, wouldn't that be GCC 13 material?  I think right now -mdiv=
> accepts random garbage like -mdiv=foobar .  There is also an enum already
> but there is no 1:1
> mapping between what is assigned to sh_div_strategy from what is in
> sh_div_str,
> and sh_div_strategy probably should be a TargetVariable.
> 
> Anyway, wouldn't the following be enough for now to just do:
> 
> 2022-03-31  Jakub Jelinek  <jakub@redhat.com>
> 
> 	PR target/105069
> 	* config/sh/sh.opt (mdiv=): Add Save.
> 
> --- gcc/config/sh/sh.opt.jj	2022-01-11 23:11:21.990295775 +0100
> +++ gcc/config/sh/sh.opt	2022-03-31 09:43:45.916244944 +0200
> @@ -207,7 +207,7 @@ Target RejectNegative Mask(ALIGN_DOUBLE)
>  Align doubles at 64-bit boundaries.
>  
>  mdiv=
> -Target RejectNegative Joined Var(sh_div_str) Init("")
> +Target Save RejectNegative Joined Var(sh_div_str) Init("")
>  Division strategy, one of: call-div1, call-fp, call-table.
>  
>  mdivsi3_libfunc=
> 
> The testcase doesn't ICE with it anymore, and e.g. i386.opt has various Save
> strings too.

Yes, that's going to work as with the patch the target value is properly saved
and restored in cl_target_option_{save,restore}.