I was thinking of the original yasm one we had from converting Pierrick Gaudry's code, i.e. what was there before we switched to your code. It was probably in the amd64 directory before you revolutionised it.
Bill. 2009/3/15 Jason Moxham <ja...@njkfrudils.plus.com>: > > On Sunday 15 March 2009 00:49:33 Bill Hart wrote: >> We can do similar to Brian and put the old assembler in for add_n and >> sub_n for nocona. >> > > svn, and commited , the nocona with no lahf will use mpn/x86_64/add_n.as , > which at the moment is GMP's old one.I assume you mean an other one. > > > >> Heh, I've just been reading instruction sets for old CPU's. I think >> the 8086 must have been the first main processor of Intel's to have a >> mul instruction. I hadn't realised that. >> >> I wonder if there were earlier processors made by other manufacturers, >> but used in home computers or games machines that had them. >> >> Bill. >> >> 2009/3/15 Jason Moxham <ja...@njkfrudils.plus.com>: >> > On Saturday 14 March 2009 23:11:07 Bill Hart wrote: >> >> I think we should examine the feature flag in config.guess for >> >> LAHF-SAHF. Here is an incomplete list of 64 bit Pentium 4's without >> >> the feature: >> >> >> >> Pentium 4 506 E0 >> >> Pentium 4 516 E0 >> >> Pentium 4 511 E0 >> >> Pentium 4 519K E0 >> >> Pentium 4 HT 521 >> >> Pentium 4 HT 531 >> >> Pentium 4 HT 541 >> >> Pentium 4 HT 551 >> >> Pentium 4 HT 561 >> >> Pentium 4 HT 571 >> >> Pentium 4 HT 3.2F >> >> Pentium 4 HT 3.4F >> >> Pentium 4 HT 3.6F >> >> Pentium 4 HT 3.8F >> >> Pentium 4 HT 517 >> >> Pentium 4 HT 524 >> >> All Family 15, Model 4, steppings N0, R0 >> >> Pentium 4 EE 3.73 >> >> >> >> Too messy to test for them all specially. >> >> >> >> Can we add a directory called LAHF to core2 and have all nocona >> >> processors use only core2 in the build whereas specifically core2 >> >> processors can use core2 and core2/lahf. It will be the simplest fix >> >> for now until we can implement something more sophisticated. >> > >> > Sounds good , give us 30 mins to do it >> > >> >> Bill. >> >> >> >> 2009/3/14 Jason Moxham <ja...@njkfrudils.plus.com>: >> >> > Early Intel CPUs with Intel 64 lacked LAHF and SAHF instructions >> >> > available in AMD64 until introduction of Pentium 4 G1 step in December >> >> > 2005. LAHF and SAHF are load and store instructions, respectively, for >> >> > certain status flags. These instructions are used for virtualization >> >> > and floating-point condition handling. >> >> > >> >> > >> >> > I'll find out model numbers soon >> >> > >> >> > On Saturday 14 March 2009 17:20:25 Gonzalo Tornaria wrote: >> >> >> On Sat, Mar 14, 2009 at 1:45 PM, Jason Moxham >> >> >> <ja...@njkfrudils.plus.com> >> >> > >> >> > wrote: >> >> >> > I pretty sure all core2 cpus have lahf,sahf , it's just some >> >> >> > Pentium D dont have it . You can test the lahf_lm feature bit in >> >> >> > cpuid to see if it's got it >> >> >> >> >> >> Tested in: >> >> >> >> >> >> My laptop: model 6 / family 15 (core 2 duo T5300). >> >> >> My desktop is family 15 / model 6 (pentium D 930). >> >> >> >> >> >> The "lahf_lm" feature is present in both according to /proc/cpuinfo. >> >> >> >> >> >> Note that the laptop is "low end" core 2 (in the sense it has no VT >> >> >> extensions). The pentium D is "high end" (in the sense it has VT >> >> >> extensions --- low end would be pentium D 8xx). Maybe that makes a >> >> >> difference? >> >> >> >> >> >> OTOH, the kvm 64 bit virtual cpu (kvm 72) doesn't seem to know about >> >> >> the "lahf_lm" (meaning, it won't report it in cpuid, even if the host >> >> >> processor has it. I assume the instructions would work anyway.) >> >> >> >> >> >> Gonzalo >> >> > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "mpir-devel" group. To post to this group, send email to mpir-devel@googlegroups.com To unsubscribe from this group, send email to mpir-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/mpir-devel?hl=en -~----------~----~----~----~------~----~------~--~---
