These code should come from original SGI MIPSpro compiler. There is no
change log on these lines in open64.net.
2011/4/1 Sun Chan <sun.c...@gmail.com>
> strange that the original code turned off simplifier first and tries
> to do that locally. Does anyone know why? These kind of thing is best
> done in the simplifier and you wouldn't need this change. On
> principle, we don't want to have to deal with all kinds of
> "canonicalization" everywhere, do we?
> Sun
>
> On Fri, Apr 1, 2011 at 2:45 AM, Gilmore, Doug <doug.gilm...@amd.com>
> wrote:
> > I attached the test and patch that were already attached to the bug.
> >
> > The text in the comment associated with patch attachment is:
> >
> > The comment above the code I changed is:
> >
> > // For example,
> > // I4I4LDID 41 <1,4,.preg_I4> T<4,.predef_I4,4> # i
> > // U4INTCONST 8 (0x8)
> > // I4MPY
> > // U8I4CVT
> > // U8U8LDID 0 <2,1,rowsptr2> T<32,anon_ptr.,8>
> > // U8ADD
> > // This can be safely converted into (without performance loss):
> > // I8INTCONST 8 (0x8)
> > // I8I4LDID 41 <1,4,.preg_I4> T<4,.predef_I4,4> # i
> > // I8MPY
> > // U8U8LDID 0 <2,1,rowsptr2> T<32,anon_ptr.,8>
> > // U8ADD
> > // We will do this only for small powers of 2 so that
> > // the I8MPY gets converted into shifts (no imul64 versus imul32).
> >
> > The original code does not implement this transformation,
> > the supplied patch I believe does.
> >
> > Could a gatekeeper review/approve this change when he or she has a
> chance?
> >
> > Thanks,
> >
> > Doug
> >
> >
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--
Regards,
Lai Jian-Xin
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