- (let ((offset (tn-offset value)))
- ;; The x86 backend uses a pun from E[A-D]X -> [A-D]L for these
- ;; tests. The Athlon 64 optimization guide says that this is a
- ;; bad idea, so it's been removed.
- (cond ((sc-is value control-stack)
- (inst test (make-ea :byte :base rbp-tn
- :disp (- (* (1+ offset) n-word-bytes)))
- sb!vm::fixnum-tag-mask))
- (t
- (inst test value sb!vm::fixnum-tag-mask)))))
+ (inst test
+ (cond ((sc-is value any-reg descriptor-reg)
+ (make-byte-tn value))
+ ((sc-is value control-stack)
+ (make-ea :byte :base rbp-tn
+ :disp (- (* (1+ (tn-offset value)) n-word-bytes))))
+ (t
+ value))
+ sb!vm::fixnum-tag-mask))