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Re: Cygwin 32bit: Can't use gcc -mfpmath=sse

On Fri, 11 Sep 2015 10:16:56 +0200, Evgeny Grin <> wrote:

10.09.2015, 23:52, "HK" <>:
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

 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 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.

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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