(csubtypep (lvar-type lvar) type))
(filter-lvar lvar
(if signedp
- `((lambda (x)
- (mask-signed-field ,width x))
- 'dummy)
+ `(mask-signed-field ,width 'dummy)
`(logand 'dummy ,(ldb (byte width 0) -1))))
(setf (block-reoptimize (node-block node)) t)
(reoptimize-component (node-component node) :maybe)