202
Chapter 36. SuperH SH64 Dependent Features
36.2. Syntax
36.2.1. Special Characters
!
is the line comment character.
You can use
;
instead of a newline to separate statements.
Since
$
has no special meaning, you may use it in symbol names.
36.2.2. Register Names
You can use the predefined symbols
r0
through
r63
to refer to the SH64 general registers,
cr0
through
cr63
for control registers,
tr0
through
tr7
for target address registers,
fr0
through
fr63
for
single precision floating point registers,
dr0
through
dr62
(even numbered registers only) for double 
precision floating point registers,
fv0
through
fv60
(multiples of four only) for single precision float 
ing point vectors,
fp0
through
fp62
(even numbered registers only) for single precision floating point
pairs,
mtrx0
through
mtrx48
(multiples of 16 only) for 4x4 matrices of single precision floating point
registers,
pc
for the program counter, and
fpscr
for the floating point status and control register.
You can also refer to the control registers by the mnemonics
sr
,
ssr
,
pssr
,
intevt
,
expevt
,
pexpevt
,
tra
,
spc
,
pspc
,
resvec
,
vbr
,
tea
,
dcr
,
kcr0
,
kcr1
,
ctc
, and
usr
.
36.2.3. Addressing Modes
SH64 operands consist of either a register or immediate value. The immediate value can be a constant
or label reference (or portion of a label reference), as in this example:
movi 4,r2
pt function, tr4
movi (function
16) & 65535,r0
   
shori function & 65535, r0
ld.l r0,4,r0
Instruction label references can reference labels in either SHmedia or SHcompact. To differentiate
between the two, labels in SHmedia sections will always have the least significant bit set (i.e. they
will be odd), which SHcompact labels will have the least significant bit reset (i.e. they will be even).
If you need to reference the actual address of a label, you can use the
datalabel
modifier, as in this
example:
.long function
.long datalabel function
In that example, the first longword may or may not have the least significant bit set depending on
whether the label is an SHmedia label or an SHcompact label. The second longword will be the actual
address of the label, regardless of what type of label it is.
36.3. SH64 Machine Directives
In addition to the SH directives, the SH64 provides the following directives:






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