(values 'unsigned-byte-32 'unsigned-reg))
(my-make-wired-tn ptype reg-sc (result-reg-offset num-results)))))
+(define-alien-type-method (integer :naturalize-gen) (type alien)
+ (if (<= (alien-type-bits type) 16)
+ (if (alien-integer-type-signed type)
+ `(sign-extend ,alien ,(alien-type-bits type))
+ `(logand ,alien ,(1- (ash 1 (alien-type-bits type)))))
+ alien))
+
(define-alien-type-method (system-area-pointer :result-tn) (type state)
(declare (ignore type))
(let ((num-results (result-state-num-results state)))
,@(new-args))))))
(sb!c::give-up-ir1-transform))))
+;;; The ABI is vague about how signed sub-word integer return values
+;;; are handled, but since gcc versions >=4.3 no longer do sign
+;;; extension in the callee, we need to do it in the caller. FIXME:
+;;; If the value to be extended is known to already be of the target
+;;; type at compile time, we can (and should) elide the extension.
+(defknown sign-extend ((signed-byte 32) t) fixnum
+ (foldable flushable movable))
+
+(define-vop (sign-extend)
+ (:translate sign-extend)
+ (:policy :fast-safe)
+ ;; Need to wire this to EAX since in x86 some dword registers don't
+ ;; have a matching word or byte register.
+ (:args (val :scs (signed-reg) :target eax))
+ (:temporary (:sc signed-reg :offset eax-offset :from :eval :to :result) eax)
+ (:arg-types signed-num (:constant fixnum))
+ (:info size)
+ (:results (res :scs (signed-reg)))
+ (:result-types fixnum)
+ (:ignore eax)
+ (:generator 1
+ (inst movsx res
+ (make-random-tn :kind :normal
+ :sc (sc-or-lose (ecase size
+ (8 'byte-reg)
+ (16 'word-reg)))
+ :offset (tn-offset val)))))
+
+#-sb-xc-host
+(defun sign-extend (x size)
+ (declare (type (signed-byte 32) x))
+ (ecase size
+ (8 (sign-extend x size))
+ (16 (sign-extend x size))))
+
+#+sb-xc-host
+(defun sign-extend (x size)
+ (if (logbitp (1- size) x)
+ (dpb x (byte size 0) -1)
+ x))
+
(define-vop (foreign-symbol-sap)
(:translate foreign-symbol-sap)
(:policy :fast-safe)