Example

from peachpy.x64 import *

# Use 'x64-ms' for Microsoft x64 ABI
abi = peachpy.c.ABI('x64-sysv')
assembler = Assembler(abi)

# Implement function void add_1(const uint32_t *src, uint32_t *dst, size_t length)
src_argument = peachpy.c.Parameter("src", peachpy.c.Type("const uint32_t*"))
dst_argument = peachpy.c.Parameter("dst", peachpy.c.Type("uint32_t*"))
len_argument = peachpy.c.Parameter("length", peachpy.c.Type("size_t"))

# This optimized kernel will target Intel Nehalem processors. Any instructions which are not
# supported on Intel Nehalem (e.g. AVX instructions) will generate an error. If you don't have
# a particular target in mind, use "Unknown"
with Function(assembler, "add_1", (src_argument, dst_argument, len_argument), "Nehalem"):
    # Load arguments into registers
    srcPointer = GeneralPurposeRegister64()
    LOAD.PARAMETER( srcPointer, src_argument )

    dstPointer = GeneralPurposeRegister64()
    LOAD.PARAMETER( dstPointer, dst_argument )

    length = GeneralPurposeRegister64()
    LOAD.PARAMETER( length, len_argument )

    # Main processing loop. Length must be a multiple of 4.
    LABEL( 'loop' )

    x = SSERegister()
    MOVDQU( x, [srcPointer] )
    ADD( srcPointer, 16 )

    # Add 1 to x
    PADDD( x, Constant.uint32x4(1) )

    MOVDQU( [dstPointer], x )
    ADD( dstPointer, 16 )

    SUB( length, 4 )
    JNZ( 'loop' )

    RETURN()

print assembler