Re: Compiling for DSP chips

pardo@cs.washington.edu (David Keppel)
26 Sep 90 23:13:03 GMT

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Re: Compiling for DSP chips avi@taux01.nsc.com (1990-09-24)
Re: Compiling for DSP chips pardo@cs.washington.edu (1990-09-26)
Re: Compiling for DSP chips seanf@sco.COM (Sean Fagan) (1990-09-30)
Re: Compiling for DSP chips pardo@cs.washington.edu (1990-10-02)
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Newsgroups: comp.compilers
From: pardo@cs.washington.edu (David Keppel)
Keywords: C, optimize, DSP
Organization: University of Washington, Computer Science, Seattle
References: <9009071606.AA22759@m2.csc.ti.com> <1990Sep11.075042.937@funet.fi> <4751@taux01.nsc.com>
Date: 26 Sep 90 23:13:03 GMT

In article <4751@taux01.nsc.com> avi@taux01.nsc.com (Avi Bloch) writes:
>[Compiler that optimizes for special instructions.]


The moderator writes:
>[GCC lets you in-line assembler, frequently hidden inside macros, that is
>often used to get to features like sin and cos instructions. -John]


In particular, you can tell GCC that certain hard registers are
clobbered, so GCC can perform register allocation around those
instructions. If the machine description knows about those
instructions, then I think that it is also possible to define
optimizations over those instructions, even if the compiler itself
doesn't ``know'' how to emit them.


;-D on ( A compile of things to do ) Pardo
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pardo@cs.washington.edu
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