On 11/17/21 10:54 AM, Paul A. Clarke wrote:
> On Tue, Nov 16, 2021 at 11:12:35AM -0600, Bill Schmidt via Gcc-patches wrote:
>> Hi! During a previous patch review, Segher asked that I provide better
>> messages when builtins are unavailable because they require both a minimum
>> CPU and the enablement of VSX instructions. This patch does just that.
> ...
>> gcc/
>> * config/rs6000/rs6000-call.c (rs6000_invalid_new_builtin): Change
>> error messages for ENB_P8V and ENB_P9V.
>> ---
>> gcc/config/rs6000/rs6000-call.c | 6 ++++--
>> 1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/gcc/config/rs6000/rs6000-call.c
>> b/gcc/config/rs6000/rs6000-call.c
>> index 85fec80c6d7..035266eb001 100644
>> --- a/gcc/config/rs6000/rs6000-call.c
>> +++ b/gcc/config/rs6000/rs6000-call.c
>> @@ -11943,7 +11943,8 @@ rs6000_invalid_new_builtin (enum rs6000_gen_builtins
>> fncode)
>> error ("%qs requires the %qs option", name, "-mcpu=power8");
>> break;
>> case ENB_P8V:
>> - error ("%qs requires the %qs option", name, "-mpower8-vector");
>> + error ("%qs requires the %qs and %qs options", name, "-mcpu=power8",
>> + "-mvsx");
> "-mcpu=power8" itself enables "-mvsx", doesn't it?
Of course, but it can be disabled with -mno-vsx. Then you get this error.
You won't get it unless you deliberately did something strange with the
compile options.
>
>> break;
>> case ENB_P9:
>> error ("%qs requires the %qs option", name, "-mcpu=power9");
>> @@ -11953,7 +11954,8 @@ rs6000_invalid_new_builtin (enum rs6000_gen_builtins
>> fncode)
>> name, "-mcpu=power9", "-m64", "-mpowerpc64");
>> break;
>> case ENB_P9V:
>> - error ("%qs requires the %qs option", name, "-mpower9-vector");
>> + error ("%qs requires the %qs and %qs options", name, "-mcpu=power9",
>> + "-mvsx");
> Similarly, "-mcpu=power9" itself enables "-mvsx", doesn't it?
>
> Are you trying to also say "don't use -mno-vsx"? If so, maybe s/and/with/
> would be slightly less confusing? This is going to be awkward unless it can
> be more precise, like two messages depending on actual context:
> - with "-mcpu=power8 -mno-vsx: "...requires -mvsx".
> - without "-mcpu=power8": "...requires -mcpu=power8".
This seems like a YMMV situation...I don't see the confusion myself.
Bill
>
> PC
