Chapter 36. SuperH SH64 Dependent Features

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.mode [shmedia|shcompact]

.isa [shmedia|shcompact]

Specify the ISA for the following instructions (the two directives are equivalent). Note that pro 

grams such as

objdump

rely on symbolic labels to determine when such mode switches occur

(by checking the least significant bit of the label's address), so such mode/isa changes should

always be followed by a label (in practice, this is true anyway). Note that you cannot use these

directives if you didn't specify an ISA on the command line.

.abi [32|64]

Specify the ABI for the following instructions. Note that you cannot use this directive unless you

specified an ABI on the command line, and the ABIs specified must match.

.uaquad

Like .uaword and .ualong, this allows you to specify an intentionally unaligned quadword (64 bit

word).

36.4. Opcodes

For detailed information on the SH64 machine instruction set, see [SuperH 64 bit RISC Series Archi 

tecture Manual] (SuperH, Inc.).

as

implements all the standard SH64 opcodes. In addition, the following pseudo opcodes may be

expanded into one or more alternate opcodes:

movi

If the value doesn't fit into a standard

movi

opcode,

as

will replace the

movi

with a sequence of

movi

and

shori

opcodes.

pt

This expands to a sequence of

movi

and

shori

opcode, followed by a

ptrel

opcode, or to a

pta

or

ptb

opcode, depending on the label referenced.