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Re: [RFC] Enable SSE2 math intrinsics for fpmath=sse and fast-math
On Wed, 8 Jun 2005, Jan Hubicka wrote:
> Hmm, for math libraries we probably won't need much future changes
> ineed. I am thinking about similar mechanizm for the string functions
> (ie glibc string functions are pretty poor on i386 for quite a while and
> calling them with stack passing conventions is quite a bottleneck). If
> we get into busyness of having our own library pieces of string
> functions I guess we can handle it independently on this issue anyway...
Before creating yet more versions of string functions I think it would be
desirable to work on an infrastructure for a string function testsuite
that can be shared between GCC and glibc. glibc has thorough testing of
its string functions; this thoroughness should apply also to testing of
all GCC's existing built-in string functions (both machine-independent and
machine-dependent optimizations) and to any new string function versions.
There is a lot of scope for problems with e.g. reading a few bytes more
than allowed which may only show up at page boundaries.
Joseph S. Myers http://www.srcf.ucam.org/~jsm28/gcc/
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