8087128: C2: Disallow definition split on MachCopySpill nodes
Reviewed-by: kvn
diff --git a/src/share/vm/opto/reg_split.cpp b/src/share/vm/opto/reg_split.cpp
index af79891..a132f1f 100644
--- a/src/share/vm/opto/reg_split.cpp
+++ b/src/share/vm/opto/reg_split.cpp
@@ -1171,9 +1171,8 @@
(deflrg._direct_conflict || deflrg._must_spill)) ||
// Check for LRG being up in a register and we are inside a high
// pressure area. Spill it down immediately.
- (defup && is_high_pressure(b,&deflrg,insidx))) ) {
+ (defup && is_high_pressure(b,&deflrg,insidx) && !n->is_SpillCopy())) ) {
assert( !n->rematerialize(), "" );
- assert( !n->is_SpillCopy(), "" );
// Do a split at the def site.
maxlrg = split_DEF( n, b, insidx, maxlrg, Reachblock, debug_defs, splits, slidx );
// If it wasn't split bail
