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2006-02-26 Roger Sayle <roger@eyesopen.com> James A. Morrison <phython@gcc.gnu.org> PR middle-end/21137 * fold-const.c (fold_binary) <EQ_EXPR>: Fold ((X>>C1)&C2) eq/ne 0, when C2 is a power of two, as either (X&(C2<<C1)) eq/ne 0 if the new constant C2<<C1, or as (X<0) or (X,false) depending upon the signedness of the shift operation. * gcc.dg/fold-eqandshift-1.c: New test case. Co-Authored-By: James A. Morrison <phython@gcc.gnu.org> From-SVN: r111453
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