Additional StormPowerASM Macros 

Please note, that you have to include stormc:include/powerpc/ppcmacros.i to
use these macros. These macros are only defined for 32 Bit operations.

bitchg Rn,const
bittst Rn,const
bitclr Rn,const
bitset Rn,const

These are the Bit-commands, like known from the 68k. You have to be careful,
though. The highest bit on the *68k* is 31, on the *PPC* this is *0* !!! bittst
stores its results in cr0.

clrb Rn
clrh Rn
clrw Rn

Clears the Low-Byte/Halfword/Word of a register, like clr on the 68k. These commands
support the . notation, like defined in Important things.

mb Rd,Rs
mh Rd,Rs

These commands copy the Low-Byte/Low-Halfword from Rs to Rd. The other Bytes of Rd
stay unchanged. These commands support the . notation.

setb Rn
seth Rn
setw Rn

These commands move the value -1 to register Rn (by setting all bits of the lowest
Byte/Halfword/Word to 1).

tstb Rn
tsth Rn
tstw Rn

These commands compare Rn with 0, like on the 68k. cr0 is set accordingly.

There are also some useful macros to access registers in ppcmacros.i:

local = r13
base  = r2
stack = r1
trash = r0

_d0             equr    r3
_d1             equr    r4
_d2             equr    r22
_d3             equr    r23
_d4             equr    r24
_d5             equr    r25
_d6             equr    r26
_d7             equr    r27
_a0             equr    r5
_a1             equr    r6
_a2             equr    r28
_a3             equr    r29
_a4             equr    base
_a5             equr    r30
_a6             equr    r31

_fp0            fequr   f1
_fp1            fequr   f2
_fp2            fequr   f3
_fp3            fequr   f4
_fp4            fequr   f5
_fp5            fequr   f6
_fp6            fequr   f7
_fp7            fequr   f8

This is especially useful, when you do context-switches and don't want to
have a look at the register table all the time.