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Re: [PATCH] Splitting of virtual definitions (aka. V_MUST_DEF)
On Mon, 2004-06-07 at 22:01, Geert Bosch wrote:
> On Jun 7, 2004, at 23:08, Jeffrey A Law wrote:
> > Having a V_MUST_DEF allows us to do some interest things as it
> > indicates a more precise level of aliasing information. ie, it
> > allows us to say that a highly specific area of memory is going
> > to be changed. With that information we can improve redundant
> > load/store elimination in addition to improving alias analysis.
> I understand, but when we add 3% to compile time as a result
> of this, we should have a double look at the data structures
> we use. How do other compilers record this data?
Interestingly enough, our handling of virtual operands has been
heavily influenced by the design of SGI's compiler. V_MUST_DEF
is just another piece we needed to add :-)