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Re: -fssa kicks butt on alphaev6 ieee floating point code
- To: Brad Lucier <lucier at math dot purdue dot edu>
- Subject: Re: -fssa kicks butt on alphaev6 ieee floating point code
- From: Jeffrey A Law <law at cygnus dot com>
- Date: Thu, 16 Mar 2000 14:10:16 -0700
- cc: rth at cygnus dot com (Richard Henderson), gcc at gcc dot gnu dot org, feeley at iro dot umontreal dot ca
- Reply-To: law at cygnus dot com
In message <200003162001.PAA26193@polya.math.purdue.edu>you write:
> Or are you saying that adding -fssa right now will not always produce
> better code on the 264 with -mieee?
Correct. Sometimes it might do better, sometimes it might do worse. It
really depends on the code, it's critical path, the number of registers
it needs, etc etc etc.
It is rather rare in the compiler development to find any non-trivial
transformation that is always an improvement.
jeff