Quoth Ben Hutchings <b...@decadent.org.uk>, on 2011-05-15 14:36:03 +0100: > There are a few new instructions on the Pentium that can be used in ring > 3: cmpxchg8 and rdtsc. Linux has separate options for '586' and '586 > with TSC', both of which result in -m586, so gcc does not appear to > assume the existence of rdtsc. I would not expect gcc to generate > cmpxchg8 except through an intrinsic, but I could be wrong.
FWIW, I'm using Debian on a Soekris box with an AMD Geode. ISTR being told in the past that this is a 486-class machine, but /proc/cpuinfo reports (with some lines elided): | processor : 0 | vendor_id : Geode by NSC | cpu family : 5 | model : 4 | model name : Geode(TM) Integrated Processor by National Semi | stepping : 0 | cpu MHz : 266.571 | cpuid level : 2 | wp : yes | flags : fpu tsc msr cx8 cmov mmx | clflush size : 32 So it does have TSC, CMPXCHG8, and CMOV support. I'm not sure where that places it exactly on the ix86 processor chart; supposedly those are the main architectural differences that can actually break things compiled for i586? ---> Drake Wilson -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20110516015702.ga11...@drache.begriffli.ch
