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PR middle-end/29749 * fold-const.c (fold_binary) <case BIT_AND_EXPR>: Optimize (X << C1) & C2 into (X << C1) & (C2 | ((1 << C1) - 1)) and (X >> C1) & C2 into (X >> C1) & (C2 | ~((type) -1 >> C1)). (fold_binary) <case LSHIFT_EXPR, case RSHIFT_EXPR>: Optimize (X & C2) << C1 into (X << C1) & (C2 << C1) and (X & C2) >> C1 into (X >> C1) & (C2 >> C1) if that allows further optimizations. * gcc.dg/fold-rotate-1.c: New test. From-SVN: r130589 |
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