The following options are available for the LANai to specify the version
of the chip for which code should be generated. By default, the
`-m3.0 -mdual-context -mno-extra-nops -mpartword-load-warning'
options are used.
-m3.0
-
This option is equivalent to `-mtwo-alus -mno-pc-load -mno-isr-load -mno-partword-load -mpartword-load-warning'.
-m3.1
-
This option is equivalent to `-m3.0'.
-m3.2
-
This option is equivalent to `-m3.1'.
-m4.0
-
This option is equivalent to `-m3.2'.
-m4.1
-
This option is equivalent to `-m4.0 -mpartword-load'. This options
takes advantage of the LANai4.1's partword-load instructions to perform
byte and short memory operations much more efficiently than
for earlier versions of the LANai.
-mnops-after-branches -mno-extra-nops
-
The `-mnops-after-branches' option forces the compiler generate a
nop to fill all delay slots, making the resulting assembly code easier
to read. The `-mno-extra-nops' option causes the compiler to emit
nops only when needed.
-msingle-context -mdual-context
-
`-msingle-context' causes code to be generated assuming that only a
single LANai context will be used, allowing that context to use all 24
LANai general-purpose registers. `-mdual-context' causes code to
be generated assuming that both LANai contexts will be used, causing only
the lower 12 general-purpose registers to be used by the generated code.
-mpartword-load-warning -mno-partword-load-warning
-
Warn (or do not warn) the user if the (ineffecient) partword load
workaround is used.
The following options are available but are automatically set
appropriately by the `-mversion' options above. Developers
outside Myricom should not use these options directly.
-mone-alu -mtwo-alus
-
Cause the generated code to use only one or both ALUs in the LANai.
-mpc-load -mno-pc-load
-
Cause the LANai to use PC loads or prevent it from doing so.
-misr-load -mno-isr-load
-
Allow or forbid ISR register loads directly from memory.
-mpartword-load -mno-partword-load
-
Allow or forbid the use of the LANai partword-load instructions.