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import sys
import struct
from rpython.rtyper.lltypesystem import lltype, rffi
from rpython.rlib.rmmap import alloc, free
CPU_ID_FUNC_PTR = lltype.Ptr(lltype.FuncType([], lltype.Signed))
def cpu_info(instr):
data = alloc(4096)
pos = 0
for c in instr:
data[pos] = c
pos += 1
fnptr = rffi.cast(CPU_ID_FUNC_PTR, data)
code = fnptr()
free(data, 4096)
return code
def detect_sse2():
code = cpu_id(eax=1)
return bool(code & (1<<25)) and bool(code & (1<<26))
def cpu_id(eax = 1, ret_edx = True, ret_ecx = False):
asm = ["\xB8", chr(eax), "\x00\x00\x00", # MOV EAX, $eax
"\x53", # PUSH EBX
"\x0F\xA2", # CPUID
"\x5B", # POP EBX
]
if ret_edx:
asm.append("\x92") # XCHG EAX, EDX
elif ret_ecx:
asm.append("\x91") # XCHG EAX, ECX
asm.append("\xC3") # RET
return cpu_info(''.join(asm))
def detect_sse4_1(code=-1):
if code == -1:
code = cpu_id(eax=1, ret_edx=False, ret_ecx=True)
return bool(code & (1<<19))
def detect_sse4_2(code=-1):
if code == -1:
code = cpu_id(eax=1, ret_edx=False, ret_ecx=True)
return bool(code & (1<<20))
def detect_sse4a(code=-1):
if code == -1:
code = cpu_id(eax=0x80000001, ret_edx=False, ret_ecx=True)
return bool(code & (1<<20))
def detect_x32_mode():
# 32-bit 64-bit / x32
code = cpu_info("\x48" # DEC EAX
"\xB8\xC8\x00\x00\x00"# MOV EAX, 200 MOV RAX, 0x40404040000000C8
"\x40\x40\x40\x40" # 4x INC EAX
"\xC3") # RET RET
assert code in (200, 204, 0x40404040000000C8)
return code == 200
if __name__ == '__main__':
if detect_sse2():
print 'Processor supports sse2'
if detect_sse4_1():
print 'Processor supports sse4.1'
if detect_sse4_2():
print 'Processor supports sse4.2'
if detect_sse4a():
print 'Processor supports sse4a'
if detect_x32_mode():
print 'Process is running in "x32" mode.'
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