[llvm-commits] [llvm] r147765 - /llvm/trunk/lib/Target/X86/X86InstrSSE.td

[Craig Topper]

Ordering seems to be maintained even for patterns declared with
instructions and those wouldn't get an anonymous def would they?

On Mon, Jan 9, 2012 at 9:54 AM, Jakob Stoklund Olesen <stoklund at 2pi.dk>wrote:

>
> On Jan 9, 2012, at 9:44 AM, Craig Topper wrote:
>
> > When patterns are collapsed the ordering of predicate checks is
> maintained. Not sure whether that's a feature or not, but it is what's
> making AVX2 broadcast instructions for integer vectors preferred over the
> FP versions. Maybe some other cases too.
>
> TableGen orders records alphabetically:
>
> class RecordKeeper {
>  std::map<std::string, Record*> Classes, Defs;
>
> There is a source location in Record, but it is only used for error
> reporting AFAICT.
>
> It is possible that the names invented for anonymous defs are source order
> related, but you shouldn't depend on it.  It is much too fragile.
>
> /jakob
>
>


-- 
~Craig
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