diff options
Diffstat (limited to 'chapter21/src/main')
| -rw-r--r-- | chapter21/src/main/java/com/seaofnodes/simple/codegen/IFG.java | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/chapter21/src/main/java/com/seaofnodes/simple/codegen/IFG.java b/chapter21/src/main/java/com/seaofnodes/simple/codegen/IFG.java index bd6c2d56..729ec88e 100644 --- a/chapter21/src/main/java/com/seaofnodes/simple/codegen/IFG.java +++ b/chapter21/src/main/java/com/seaofnodes/simple/codegen/IFG.java @@ -207,8 +207,15 @@ abstract public class IFG { // Disallow clone-ables from killing registers. Just fail // them and re-clone closer to target... so no kill. // Special case for Intel XOR used to zero. - if( m.isClone() ) + Node n = (Node)m; + CFGNode effUseBlk = n.out(0) instanceof PhiNode phi ? phi.region().cfg(phi._inputs.find(n)) : n.out(0).cfg0(); + if( m.isClone() && // Must be clonable + (n.nOuts()>1 || // Has many users OR + // Only 1 user but effective use is remote block + effUseBlk != n.cfg0() )) + // Then fail the clonable; it should split or move alloc.fail(alloc.lrg((Node)m)); + // Else clonable cannot move else if( !tlrg.sub(killMask) ) alloc.fail(tlrg); } |