Texas Instruments TMS320C2x, User Manual

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Invoking the Tools Individually
2-43 C Compiler Description
To invoke the optimizer, enter:
dspopt [ input file [ output file ]] [ options ]
dspopt is the command that invokes the optimizer.
input file names the intermediate file produced by the parser. The
optimizer assumes that the extension is
.if . If you do not speci-
fy an input file, the optimizer prompts you for one.
output file names the intermediate file that the optimizer creates. If you
do not supply a filename for the output file, the optimizer uses
the input filename with the extension
.opt .
options affect how the the optimizer processes the input file. The
options that you use in stand-alone optimization are the same
as those used for dspcl. Table 2
− 6 shows the optimizer
options, the dspcl shell options, and the corresponding func-
tions. Section 3.1,
Using the C Compiler Optimizer , on page
3-2 provides a detailed list of the optimizations performed at
each level.
Table 2 − 6. Optimizer Options and dspcl Options
dspopt Option dspcl Option Function
− a − ma Assume variables are aliased
− b − mb Disable the noninterruptible RPTK instruction for
moving structures
− g register − r register Reserve global register †
− h size − ol size Control assumptions about library function calls
− i n − oi n Set automatic inlining size threshold ( − o3 only)
− j − oe Assume no functions call, or are called by, inter-
rupt functions
− k − pk Allow K&R compatibility
− n n − on n Generate optimization information file ( − o3 only)
− o0 − o0 Optimize at level 0; register optimization
− o1 − o1 Optimize at level 1; + local optimization
†
The − g option tells the code generator that the register named is reserved for global use. See sec-
tion 5.6, Creating Global Register Variables , on page 5-10, for more information.