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PR tree-optimization/23452 * fold-const.c (fold_mult_zconjz): New subroutine of fold_binary, to optimize z * conj(z) as realpart(z)^2 + imagpart(z)^2. (fold_binary) <MULT_EXPR>: Call fold_mult_zconjz for integral complex values and with -ffast-math for FP complex values. * gcc.dg/fold-mulconj-1.c: New test case. From-SVN: r114246
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