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diff src/share/vm/opto/postaloc.cpp @ 2008:2f644f85485d

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6961690: load oops from constant table on SPARC Summary: oops should be loaded from the constant table of an nmethod instead of materializing them with a long code sequence. Reviewed-by: never, kvn
author twisti
date Fri, 03 Dec 2010 01:34:31 -0800
parents f95d63e2154a
children 8f47d8870d9a
line wrap: on
line diff
--- a/src/share/vm/opto/postaloc.cpp	Thu Dec 02 17:21:12 2010 -0800
+++ b/src/share/vm/opto/postaloc.cpp	Fri Dec 03 01:34:31 2010 -0800
@@ -200,6 +200,19 @@
   // then reloaded BUT survives in a register the whole way.
   Node *val = skip_copies(n->in(k));
 
+  if (val == x && nk_idx != 0 &&
+      regnd[nk_reg] != NULL && regnd[nk_reg] != x &&
+      n2lidx(x) == n2lidx(regnd[nk_reg])) {
+    // When rematerialzing nodes and stretching lifetimes, the
+    // allocator will reuse the original def for multidef LRG instead
+    // of the current reaching def because it can't know it's safe to
+    // do so.  After allocation completes if they are in the same LRG
+    // then it should use the current reaching def instead.
+    n->set_req(k, regnd[nk_reg]);
+    blk_adjust += yank_if_dead(val, current_block, &value, &regnd);
+    val = skip_copies(n->in(k));
+  }
+
   if( val == x ) return blk_adjust; // No progress?
 
   bool single = is_single_register(val->ideal_reg());