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changeset 995:ddd6f1182ae3

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6883468: C2 compiler enters infinite loop in PhaseIterGVN::transform Summary: Avoid ideal transformation ping-pong between AddPNode::Ideal() and CastX2PNode::Ideal(). Reviewed-by: cfang
author kvn
date Fri, 25 Sep 2009 13:26:02 -0700
parents 753cf9794df9
children d6b9fd78f389
files src/share/vm/opto/connode.cpp
diffstat 1 files changed, 3 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/vm/opto/connode.cpp	Wed Sep 23 23:57:44 2009 -0700
+++ b/src/share/vm/opto/connode.cpp	Fri Sep 25 13:26:02 2009 -0700
@@ -1085,6 +1085,9 @@
   switch (op) {
   case Op_SubX:
     x = in(1)->in(1);
+    // Avoid ideal transformations ping-pong between this and AddP for raw pointers.
+    if (phase->find_intptr_t_con(x, -1) == 0)
+      break;
     y = in(1)->in(2);
     if (fits_in_int(phase->type(y), true)) {
       return addP_of_X2P(phase, x, y, true);