In local-alloc.c, block_alloc():

          if (optimize
              && recog_data.n_operands > 1
              && recog_data.constraints[0][0] == '='
              && recog_data.constraints[0][1] != '&')
            {

   The documentation about "Constraint Modifier Characters" says:

        "`&' applies only to the alternative in which it is written."

-- 
Rask Ingemann Lambertsen
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