gmp-6.1.0 on Cygwin

Mallinson, Andrew andrew.mallinson at
Mon Nov 30 09:18:00 UTC 2015


Re testing on BDW and SKX, would Intel SDE help at all:

HTH Andy 

-----Original Message-----
From: gmp-discuss [mailto:gmp-discuss-bounces at] On Behalf Of ASSI
Sent: Friday, November 27, 2015 9:48 PM
To: gmp-discuss at
Subject: gmp-6.1.0 on Cygwin

[I'm the current Cygwin gmp maintainer.]

I've recently updated to gmp-6.1.0 on Cygwin and a few users have reported problems with various bits and pieces of gcc segfaulting.  In all those cases, going back to gmp-6.0.0a got things back to working.  Two problems have been observed on Broadwell CPU (i5-5300U and i7-5600U) and all on 64bit (x86_64).  Looking at the release notes the only thing that stands out is the ADX instruction support for Broadwell/Skylake, which incidentally isn't used in 32bit when a fat binary is built (at least my interpretation of fat.c is that Broadwell/Skylake have no special treatment for 32bit, which is a bit peculiar -- I'd think they should at least get listed along with Haswell).  I can't test on either architecture myself.

Since I don't want to downrev gmp for everybody, is there an easy way to skip that bit of code when building gmp?  That would also provide an indication of whether that is the right spot to further investigate where the problems in the applications come from.

Thank you.

+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

Wavetables for the Terratec KOMPLEXER:

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