First cut at adding a 3-arg versions of the basic operations to reduce
consing by allowing the third argument to be a place where the result can be stored. This is intended to help reduce allocation and gc costs for Lisps that use arrays to represent quad-doubles. More work is needed to make the compiler macros do the right thing for CMUCL. qd-rep.lisp: o Add %STORE-QD-D to store a quad-double into a place. For CMUCL, there place argument is ignored and a fresh quad-double is created. qd.lisp: o Modify ADD-QD, SUB-QD, MUL-QD, and DIV-QD to take an optional third argument indicating where the result can be stored. Ignored on CMUCL. o Add ADD-QD-T, SUB-QD-T, MUL-QD-T, and DIV-QD-T, which are 3-arg functions with the third arg always required which is the storage area to hold the result. Ignored on CMUCL. o Add compiler macros to convert ADD-QD and friends to ADD-QD-T if the third arg is always given. The effect is, essentially, inlining ADD-QD.
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