diff options
Diffstat (limited to 'src/share/vm/opto/coalesce.cpp')
| -rw-r--r-- | src/share/vm/opto/coalesce.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/share/vm/opto/coalesce.cpp b/src/share/vm/opto/coalesce.cpp index 311b55a71..2144b59ec 100644 --- a/src/share/vm/opto/coalesce.cpp +++ b/src/share/vm/opto/coalesce.cpp @@ -780,6 +780,14 @@ bool PhaseConservativeCoalesce::copy_copy( Node *dst_copy, Node *src_copy, Block // Number of bits free uint rm_size = rm.Size(); + if (UseFPUForSpilling && rm.is_AllStack() ) { + // Don't coalesce when frequency difference is large + Block *dst_b = _phc._cfg._bbs[dst_copy->_idx]; + Block *src_def_b = _phc._cfg._bbs[src_def->_idx]; + if (src_def_b->_freq > 10*dst_b->_freq ) + return false; + } + // If we can use any stack slot, then effective size is infinite if( rm.is_AllStack() ) rm_size += 1000000; // Incompatible masks, no way to coalesce |