Intel
960 options
The following -m
options are defined for the Intel 960 implementations.
- -mcpu type
- -mnumerics
- -msoft-float
- -mleaf-procedures
- -mno-leaf-procedures
- -mtail-call
- -mno-tail-call
- -mcomplex-addr
- -mno-complex-addr
- -mcode-align
- -mno-code-align
- -mic-compat
- -mic2.0-compat
- -mic3.0-compat
- -masm-compat
- -mintel-asm
- -mstrict-align
- -mno-strict-align
- -mold-align
- Assume the defaults for
the machine type cpu
type for
some of the other options, including instruction scheduling, floating-point
support, and addressing modes. The choices for cpu
type are ka,
kb,
mc,
ca,
cf,
sa,
and sb.
The default is kb.
- The -mnumerics
option indicates that the processor does support floating-point instructions.
The -msoft-float
option indicates that floating-point support should not be assumed.
- Do (or do not) attempt to
alter leaf procedures to be callable with the bal
instruction as well as call.
This will result in more efficient code for explicit calls when the bal
instruction can be substituted by the assembler or linker, but less efficient
code in other cases, such as calls via function pointers, or using a linker
that doesnt support this optimization.
- Do (or do not) make additional
attempts (beyond those of the machine-independent portions of the compiler)
to optimize tail-recursive calls into branches. You may not want to do
this because the detection of cases where this is not valid is not totally
complete.
The default is -mno-tail-call.
- Assume (or do not assume)
that the use of a complex addressing mode is a win on this implementation
of the i960. Complex addressing modes may not be worthwhile on the K-series,
but they definitely are on the C-series. The default is currently -mcomplex-addr
for all processors except the CB and CC.
- Align code to 8-byte boundaries
for faster fetching (or dont bother). Currently turned on by default for
C-series implementations only.
- Enable compatibility with
iC960 v2.0 or v3.0.
- Enable compatibility with
the iC960 assembler.
- Do not permit (do permit)
unaligned accesses.
- Enable structure-alignment
compatibility with Intels GCC release version 1.3 (based on GCC 1.37).
This option implies -mstrict-align.
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