Cygwin 32bit: Can't use gcc -mfpmath=sse
HK
hk1020@t-online.de
Fri Sep 11 12:04:00 GMT 2015
On Fri, 11 Sep 2015 10:16:56 +0200, Evgeny Grin <k2k@yandex.ru> wrote:
> 10.09.2015, 23:52, "HK" <hk1020@t-online.de>:
>> On Thu, 10 Sep 2015 13:19:04 +0200, V?clav_Haisman wrote:
>>> On 10 September 2015 at 01:30, HK wrote:
>>>> hello.c:1:0: warning: SSE instruction set disabled, using 387
>>>> arithmetics
>>>
>>> Does it help to use `-march=native`? My hunch is that this is because
>>> the default CPU type is set to such that does not have SSE.
>>
>> Yep, that did the trick. Thanks for the suggestion. Now, is this a gcc
>> build
>> build problem? The 64bit version doesn't need -march=native and that is
>> on
>> the same computer.
>
> It's not a problem as by default GCC generate code compatible with
> maximum number of CPU models.
> If you need to generate an SSE instructions, you have to use at lest
> -march=pentium3.
> For x86-64 version, SSE is always enabled as all x86-64 CPUs support SSE
> and SSE2.
> See http://gcc.gnu.org/onlinedocs/gcc/x86-Options.html#x86-Options
Thanks. While I don't quite agree with the choice of defaults it makes
sense.
So does my 32bit window next to the 64bit window on the same computer
really
have a different instruction set? Anyway, case closed.
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