1.1 --- a/src/share/vm/opto/subnode.cpp Tue Sep 30 15:53:55 2008 -0700
1.2 +++ b/src/share/vm/opto/subnode.cpp Thu Oct 02 08:37:44 2008 -0700
1.3 @@ -206,6 +206,14 @@
1.4 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(2) == in2->in(2) )
1.5 return new (phase->C, 3) SubINode( in1->in(1), in2->in(1) );
1.6
1.7 + // Convert "(A+X) - (X+B)" into "A - B"
1.8 + if( op1 == Op_AddI && op2 == Op_AddI && in1->in(2) == in2->in(1) )
1.9 + return new (phase->C, 3) SubINode( in1->in(1), in2->in(2) );
1.10 +
1.11 + // Convert "(X+A) - (B+X)" into "A - B"
1.12 + if( op1 == Op_AddI && op2 == Op_AddI && in1->in(1) == in2->in(2) )
1.13 + return new (phase->C, 3) SubINode( in1->in(2), in2->in(1) );
1.14 +
1.15 // Convert "A-(B-C)" into (A+C)-B", since add is commutative and generally
1.16 // nicer to optimize than subtract.
1.17 if( op2 == Op_SubI && in2->outcnt() == 1) {
