Forgot to say, I suspected the detect might not work on 64-bit AMD. I found it hard to believe but AMD reports a different model number in 64-bit mode.
Could you grep CPUID your debug.log and tell me what it says? (and anyone else with 64-bit AMD) And what AMD chip do you have?
Do all AMDs that support 64-bit have the better SSE2 hardware also?
Will that be enough ?:
cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 16
model : 2
model name : AMD Phenom(tm) 9850 Quad-Core Processor
stepping : 3
cpu MHz : 2508.353
cache size : 512 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs npt lbrv svm_lock
bogomips : 5018.72
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstateEDIT: Also, i have just found out how to do the cpuid thingy:
CPUID 444d4163 family 16, model 2, stepping 3, fUseSSE2=0