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3 Commits

Author SHA1 Message Date
Chris Lattner
bfffa4f21e Simplify the side effect stuff a bit more and make licm/sinking 
both work right according to the new flags.

This removes the TII::isReallySideEffectFree predicate, and adds
TII::isInvariantLoad. 

It removes NeverHasSideEffects+MayHaveSideEffects and adds
UnmodeledSideEffects as machine instr flags.  Now the clients
can decide everything they need.

I think isRematerializable can be implemented in terms of the
flags we have now, though I will let others tackle that.

llvm-svn: 45843
 2008-01-10 23:08:24 +00:00
Chris Lattner
9b7b3ade8f add a mayLoad property for machine instructions, a correlary to mayStore. 
This is currently not set by anything.

llvm-svn: 45748
 2008-01-08 18:05:21 +00:00
Chris Lattner
ba567fa77b split TargetInstrDesc out into its own header file. 
llvm-svn: 45696
 2008-01-07 07:33:08 +00:00