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changeset

6883468: C2 compiler enters infinite loop in PhaseIterGVN::transform

Fri, 25 Sep 2009 13:26:02 -0700

author
kvn
date
Fri, 25 Sep 2009 13:26:02 -0700
changeset 1430
ddd6f1182ae3
parent 1429
753cf9794df9
child 1431
d6b9fd78f389

6883468: C2 compiler enters infinite loop in PhaseIterGVN::transform
Summary: Avoid ideal transformation ping-pong between AddPNode::Ideal() and CastX2PNode::Ideal().
Reviewed-by: cfang

src/share/vm/opto/connode.cpp file | annotate | diff | comparison | revisions 
     1.1 --- a/src/share/vm/opto/connode.cpp	Wed Sep 23 23:57:44 2009 -0700
     1.2 +++ b/src/share/vm/opto/connode.cpp	Fri Sep 25 13:26:02 2009 -0700
     1.3 @@ -1085,6 +1085,9 @@
     1.4    switch (op) {
     1.5    case Op_SubX:
     1.6      x = in(1)->in(1);
     1.7 +    // Avoid ideal transformations ping-pong between this and AddP for raw pointers.
     1.8 +    if (phase->find_intptr_t_con(x, -1) == 0)
     1.9 +      break;
    1.10      y = in(1)->in(2);
    1.11      if (fits_in_int(phase->type(y), true)) {
    1.12        return addP_of_X2P(phase, x, y, true);

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