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* trans-expr.c (is_zero_initializer_p): Determine whether a given constant expression is a zero initializer. (gfc_trans_zero_assign): New function to attempt to optimize "a(:) = 0.0" as a call to __builtin_memset (a, 0, sizeof(a)); (gfc_trans_assignment): Special case array assignments to a zero initializer constant, using gfc_trans_zero_assign. * gfortran.dg/array_memset_1.f90: New test case. From-SVN: r120078
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