Chris Lattner fe1630b43e Force coallescing of live ranges that have a single definition, even if they ... interfere. Because these intervals have a single definition, and one of them is a copy instruction, they are always safe to merge even if their lifetimes interfere. This slightly reduces the amount of spill code, for example on 252.eon, from: 12837 spiller - Number of loads added 7604 spiller - Number of stores added 5842 spiller - Number of register spills 18155 liveintervals - Number of identity moves eliminated after coalescing to: 12754 spiller - Number of loads added 7585 spiller - Number of stores added 5803 spiller - Number of register spills 18262 liveintervals - Number of identity moves eliminated after coalescing The much much bigger win would be to merge intervals with multiple definitions (aka phi nodes) but this is not that day. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15124 91177308-0d34-0410-b5e6-96231b3b80d8		2004-07-23 05:26:05 +00:00
..
Config
llvm	Force coallescing of live ranges that have a single definition, even if they	2004-07-23 05:26:05 +00:00
Support	Include <iostream> here, because most people using DEBUG() want to use std::cerr too.	2004-07-21 20:50:22 +00:00