(:temporary (:sc non-descriptor-reg :offset nl3-offset) pa-flag)
(:generator 6
(inst addi bytes extra (* (1+ words) n-word-bytes))
- (inst slwi header bytes (- n-widetag-bits 2))
+ (inst slwi header bytes (- n-widetag-bits n-fixnum-tag-bits))
(inst addi header header (+ (ash -2 n-widetag-bits) type))
(inst clrrwi bytes bytes n-lowtag-bits)
(pseudo-atomic (pa-flag)