Mercurial > hg > truffle
diff src/share/vm/opto/subnode.cpp @ 400:cc80376deb0c
6667595: Set probability FAIR for pre-, post- loops and ALWAYS for main loop
Summary: Fix loop's probability. Add optimizations to avoid spilling. Change InlineSmallCode to product flag.
Reviewed-by: never
| author | kvn |
|---|---|
| date | Thu, 02 Oct 2008 08:37:44 -0700 |
| parents | ce93a51457ae |
| children | 90a66aa50514 |
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--- a/src/share/vm/opto/subnode.cpp Tue Sep 30 15:53:55 2008 -0700 +++ b/src/share/vm/opto/subnode.cpp Thu Oct 02 08:37:44 2008 -0700 @@ -206,6 +206,14 @@ if( op1 == Op_AddI && op2 == Op_AddI && in1->in(2) == in2->in(2) ) return new (phase->C, 3) SubINode( in1->in(1), in2->in(1) ); + // Convert "(A+X) - (X+B)" into "A - B" + if( op1 == Op_AddI && op2 == Op_AddI && in1->in(2) == in2->in(1) ) + return new (phase->C, 3) SubINode( in1->in(1), in2->in(2) ); + + // Convert "(X+A) - (B+X)" into "A - B" + if( op1 == Op_AddI && op2 == Op_AddI && in1->in(1) == in2->in(2) ) + return new (phase->C, 3) SubINode( in1->in(2), in2->in(1) ); + // Convert "A-(B-C)" into (A+C)-B", since add is commutative and generally // nicer to optimize than subtract. if( op2 == Op_SubI && in2->outcnt() == 1) {