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(gcc-300.info)Intel 960 Options
Intel 960 Options
-----------------
These `-m' options are defined for the Intel 960 implementations:
`-mCPU-TYPE'
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'.
`-mnumerics'
`-msoft-float'
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.
`-mleaf-procedures'
`-mno-leaf-procedures'
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 doesn't support this optimization.
`-mtail-call'
`-mno-tail-call'
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'.
`-mcomplex-addr'
`-mno-complex-addr'
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.
`-mcode-align'
`-mno-code-align'
Align code to 8-byte boundaries for faster fetching (or don't
bother). Currently turned on by default for C-series
implementations only.
`-mic-compat'
`-mic2.0-compat'
`-mic3.0-compat'
Enable compatibility with iC960 v2.0 or v3.0.
`-masm-compat'
`-mintel-asm'
Enable compatibility with the iC960 assembler.
`-mstrict-align'
`-mno-strict-align'
Do not permit (do permit) unaligned accesses.
`-mold-align'
Enable structure-alignment compatibility with Intel's gcc release
version 1.3 (based on gcc 1.37). This option implies
`-mstrict-align'.
`-mlong-double-64'
Implement type `long double' as 64-bit floating point numbers.
Without the option `long double' is implemented by 80-bit floating
point numbers. The only reason we have it because there is no
128-bit `long double' support in `fp-bit.c' yet. So it is only
useful for people using soft-float targets. Otherwise, we should
recommend against use of it.
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