My nocona with lahf is now a "core2-unknown-linux-gnu". Thanks for upgrading it for me... I hope it still keeps my office warm in winter :-)
Gonzalo On Sat, Mar 14, 2009 at 10:29 PM, Jason Moxham <ja...@njkfrudils.plus.com> wrote: > > 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 -~----------~----~----~----~------~----~------~--~---
