;;; -*- Package: ALPHA -*-
;;;
;;; **********************************************************************
;;; This code was written as part of the CMU Common Lisp project at
;;; Carnegie Mellon University, and has been placed in the public domain.
;;;
(ext:file-comment
  "$Header: /home/pvaneynd/fakeroot/cvs2.cons.org/src/compiler/alpha/array.lisp,v 1.2 1994/10/31 04:39:51 ram Exp $")
;;;
;;; **********************************************************************
;;;
;;;    This file contains the Alpha definitions for array operations.
;;;
;;; Written by William Lott
;;; Conversion by Sean Hallgren
;;;
(in-package "ALPHA")


;;;; Allocator for the array header.

(define-vop (make-array-header)
  (:policy :fast-safe)
  (:translate make-array-header)
  (:args (type :scs (any-reg))
	 (rank :scs (any-reg)))
  (:arg-types positive-fixnum positive-fixnum)
  (:temporary (:scs (any-reg)) bytes)
  (:temporary (:scs (non-descriptor-reg)) header)
  (:results (result :scs (descriptor-reg)))
  (:generator 13
    (inst addq rank (+ (* array-dimensions-offset word-bytes)
		       lowtag-mask)
	  bytes)
    (inst li (lognot lowtag-mask) header)
    (inst and bytes header bytes)
    (inst addq rank (fixnum (1- array-dimensions-offset)) header)
    (inst sll header type-bits header)
    (inst bis header type header)
    (inst srl header 2 header)
    (pseudo-atomic ()
      (inst bis alloc-tn other-pointer-type result)
      (storew header result 0 other-pointer-type)
      (inst addq alloc-tn bytes alloc-tn))))



;;;; Additional accessors and setters for the array header.

(defknown lisp::%array-dimension (t index) index
  (flushable))
(defknown lisp::%set-array-dimension (t index index) index
  ())

(define-full-reffer %array-dimension *
  array-dimensions-offset other-pointer-type
  (any-reg) positive-fixnum lisp::%array-dimension)

(define-full-setter %set-array-dimension *
  array-dimensions-offset other-pointer-type
  (any-reg) positive-fixnum lisp::%set-array-dimension #+gengc nil)


(defknown lisp::%array-rank (t) index (flushable))

(define-vop (array-rank-vop)
  (:translate lisp::%array-rank)
  (:policy :fast-safe)
  (:args (x :scs (descriptor-reg)))
  (:temporary (:scs (non-descriptor-reg)) temp)
  (:results (res :scs (any-reg descriptor-reg)))
  (:generator 6
    (loadw temp x 0 other-pointer-type)
    (inst sra temp type-bits temp)
    (inst subq temp (1- array-dimensions-offset) temp)
    (inst sll temp 2 res)))



;;;; Bounds checking routine.


(define-vop (check-bound)
  (:translate %check-bound)
  (:policy :fast-safe)
  (:args (array :scs (descriptor-reg))
	 (bound :scs (any-reg descriptor-reg))
	 (index :scs (any-reg descriptor-reg) :target result))
  (:results (result :scs (any-reg descriptor-reg)))
  (:temporary (:scs (non-descriptor-reg)) temp)
  (:vop-var vop)
  (:save-p :compute-only)
  (:generator 5
    (let ((error (generate-error-code vop invalid-array-index-error
				      array bound index)))
      (inst cmpult index bound temp)
      (inst beq temp error)
      (move index result))))



;;;; Accessors/Setters

;;; Variants built on top of word-index-ref, etc.  I.e. those vectors whos
;;; elements are represented in integer registers and are built out of
;;; 8, 16, or 32 bit elements.

(eval-when (compile eval)

(defmacro def-full-data-vector-frobs (type element-type &rest scs)
  `(progn
     (define-full-reffer ,(symbolicate "DATA-VECTOR-REF/" type) ,type
       vector-data-offset other-pointer-type
       ,(remove-if #'(lambda (x) (member x '(null zero))) scs)
       ,element-type
       data-vector-ref)
     (define-full-setter ,(symbolicate "DATA-VECTOR-SET/" type) ,type
       vector-data-offset other-pointer-type ,scs ,element-type
       data-vector-set #+gengc ,(if (member 'descriptor-reg scs) t nil))))

(defmacro def-partial-data-vector-frobs
	  (type element-type size signed &rest scs)
  `(progn
     (define-partial-reffer ,(symbolicate "DATA-VECTOR-REF/" type) ,type
       ,size ,signed vector-data-offset other-pointer-type ,scs
       ,element-type data-vector-ref)
     (define-partial-setter ,(symbolicate "DATA-VECTOR-SET/" type) ,type
       ,size vector-data-offset other-pointer-type ,scs
       ,element-type data-vector-set)))

); eval-when (compile eval)

(def-full-data-vector-frobs simple-vector *
  descriptor-reg any-reg null zero)

(def-partial-data-vector-frobs simple-string base-char :byte nil
  base-char-reg)

(def-partial-data-vector-frobs simple-array-unsigned-byte-8 positive-fixnum
  :byte nil unsigned-reg signed-reg)

(def-partial-data-vector-frobs simple-array-unsigned-byte-16 positive-fixnum
  :short nil unsigned-reg signed-reg)

(def-full-data-vector-frobs simple-array-unsigned-byte-32 unsigned-num
  unsigned-reg)



;;; Integer vectors whos elements are smaller than a byte.  I.e. bit, 2-bit,
;;; and 4-bit vectors.
;;; 

(defmacro def-small-data-vector-frobs (type bits)
  (let* ((elements-per-word (floor word-bits bits))
	 (bit-shift (1- (integer-length elements-per-word))))
    `(progn
       (define-vop (,(symbolicate 'data-vector-ref/ type))
	 (:note "inline array access")
	 (:translate data-vector-ref)
	 (:policy :fast-safe)
	 (:args (object :scs (descriptor-reg))
		(index :scs (unsigned-reg)))
	 (:arg-types ,type positive-fixnum)
	 (:results (value :scs (any-reg)))
	 (:result-types positive-fixnum)
	 (:temporary (:scs (interior-reg)) lip)
	 (:temporary (:scs (non-descriptor-reg) :to (:result 0)) temp result)
	 (:generator 20
	   (inst srl index ,bit-shift temp)
	   (inst sll temp 2 temp)
	   (inst addq object temp lip)
	   (inst ldl result
		 (- (* vector-data-offset word-bytes)
		    other-pointer-type)
		  lip)
	   (inst and index ,(1- elements-per-word) temp)
	   ,@(when (eq (backend-byte-order *backend*) :big-endian)
	       `((inst xor temp ,(1- elements-per-word) temp)))
	   ,@(unless (= bits 1)
	       `((inst sll temp ,(1- (integer-length bits)) temp)))
	   (inst srl result temp result)
	   (inst and result ,(1- (ash 1 bits)) result)
	   (inst sll result 2 value)))
       (define-vop (,(symbolicate 'data-vector-ref-c/ type))
	 (:translate data-vector-ref)
	 (:policy :fast-safe)
	 (:args (object :scs (descriptor-reg)))
	 (:arg-types ,type
		     (:constant
		      (integer 0
			       ,(1- (* (1+ (- (floor (+ #x7fff
							other-pointer-type)
						     word-bytes)
					      vector-data-offset))
				       elements-per-word)))))
	 (:info index)
	 (:results (result :scs (unsigned-reg)))
	 (:result-types positive-fixnum)
	 (:generator 15
	   (multiple-value-bind (word extra) (floor index ,elements-per-word)
	     ,@(when (eq (backend-byte-order *backend*) :big-endian)
		 `((setf extra (logxor extra (1- ,elements-per-word)))))
	     (loadw result object (+ word vector-data-offset) 
		    other-pointer-type)
	     (unless (zerop extra)
	       (inst srl result (* extra ,bits) result))
	     (unless (= extra ,(1- elements-per-word))
	       (inst and result ,(1- (ash 1 bits)) result)))))
       (define-vop (,(symbolicate 'data-vector-set/ type))
	 (:note "inline array store")
	 (:translate data-vector-set)
	 (:policy :fast-safe)
	 (:args (object :scs (descriptor-reg))
		(index :scs (unsigned-reg) :target shift)
		(value :scs (unsigned-reg zero immediate) :target result))
	 (:arg-types ,type positive-fixnum positive-fixnum)
	 (:results (result :scs (unsigned-reg)))
	 (:result-types positive-fixnum)
	 (:temporary (:scs (interior-reg)) lip)
	 (:temporary (:scs (non-descriptor-reg)) temp old)
	 (:temporary (:scs (non-descriptor-reg) :from (:argument 1)) shift)
	 (:generator 25
	   (inst srl index ,bit-shift temp)
	   (inst sll temp 2 temp)
	   (inst addq object temp lip)
	   (inst ldl old
		 (- (* vector-data-offset word-bytes)
		    other-pointer-type)
		 lip)
	   (inst and index ,(1- elements-per-word) shift)
	   ,@(when (eq (backend-byte-order *backend*) :big-endian)
	       `((inst xor shift ,(1- elements-per-word) shift)))
	   ,@(unless (= bits 1)
	       `((inst sll shift ,(1- (integer-length bits)) shift)))
	   (unless (and (sc-is value immediate)
			(= (tn-value value) ,(1- (ash 1 bits))))
	     (inst li ,(1- (ash 1 bits)) temp)
	     (inst sll temp shift temp)
	     (inst not temp temp)
	     (inst and old temp old))
	   (unless (sc-is value zero)
	     (sc-case value
	       (immediate
		(inst li (logand (tn-value value) ,(1- (ash 1 bits))) temp))
	       (unsigned-reg
		(inst and value ,(1- (ash 1 bits)) temp)))
	     (inst sll temp shift temp)
	     (inst bis old temp old))
	   (inst stl old
		 (- (* vector-data-offset word-bytes)
		    other-pointer-type)
		 lip)
	   (sc-case value
	     (immediate
	      (inst li (tn-value value) result))
	     (zero
	      (move zero-tn result))
	     (unsigned-reg
	      (move value result)))))
       (define-vop (,(symbolicate 'data-vector-set-c/ type))
	 (:translate data-vector-set)
	 (:policy :fast-safe)
	 (:args (object :scs (descriptor-reg))
		(value :scs (unsigned-reg zero immediate) :target result))
	 (:arg-types ,type
		     (:constant
		      (integer 0
			       ,(1- (* (1+ (- (floor (+ #x7fff
							other-pointer-type)
						     word-bytes)
					      vector-data-offset))
				       elements-per-word))))
		     positive-fixnum)
	 (:info index)
	 (:results (result :scs (unsigned-reg)))
	 (:result-types positive-fixnum)
	 (:temporary (:scs (non-descriptor-reg)) temp old)
	 (:generator 20
	   (multiple-value-bind (word extra) (floor index ,elements-per-word)
	     ,@(when (eq (backend-byte-order *backend*) :big-endian)
		 `((setf extra (logxor extra (1- ,elements-per-word)))))
	     (inst ldl object
		   (- (* (+ word vector-data-offset) word-bytes)
		      other-pointer-type)
		    old)
	     (unless (and (sc-is value immediate)
			  (= (tn-value value) ,(1- (ash 1 bits))))
	       (cond ((= extra ,(1- elements-per-word))
		      (inst sll old ,bits old)
		      (inst srl old ,bits old))
		     (t
		      (inst li
			    (lognot (ash ,(1- (ash 1 bits)) (* extra ,bits)))
			    temp)
		      (inst and old temp old))))
	     (sc-case value
	       (zero)
	       (immediate
		(let ((value (ash (logand (tn-value value) ,(1- (ash 1 bits)))
				  (* extra ,bits))))
		  (cond ((< value #x10000)
			 (inst bis old value old))
			(t
			 (inst li value temp)
			 (inst bis old temp old)))))
	       (unsigned-reg
		(inst sll value (* extra ,bits) temp)
		(inst bis old temp old)))
	     (inst stl old
		   (- (* (+ word vector-data-offset) word-bytes)
		      other-pointer-type)
		    object)
	     (sc-case value
	       (immediate
		(inst li (tn-value value) result))
	       (zero
		(move zero-tn result))
	       (unsigned-reg
		(move value result)))))))))

(def-small-data-vector-frobs simple-bit-vector 1)
(def-small-data-vector-frobs simple-array-unsigned-byte-2 2)
(def-small-data-vector-frobs simple-array-unsigned-byte-4 4)


;;; And the float variants.
;;; 

(define-vop (data-vector-ref/simple-array-single-float)
  (:note "inline array access")
  (:translate data-vector-ref)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
	 (index :scs (any-reg)))
  (:arg-types simple-array-single-float positive-fixnum)
  (:results (value :scs (single-reg)))
  (:result-types single-float)
  (:temporary (:scs (interior-reg)) lip)
  (:generator 20
    (inst addq object index lip)
    (inst lds value
	  (- (* vector-data-offset word-bytes)
	     other-pointer-type)
	   lip)))

(define-vop (data-vector-set/simple-array-single-float)
  (:note "inline array store")
  (:translate data-vector-set)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
	 (index :scs (any-reg))
	 (value :scs (single-reg) :target result))
  (:arg-types simple-array-single-float positive-fixnum single-float)
  (:results (result :scs (single-reg)))
  (:result-types single-float)
  (:temporary (:scs (interior-reg)) lip)
  (:generator 20
    (inst addq object index lip)
    (inst sts value
	  (- (* vector-data-offset word-bytes)
	     other-pointer-type)
	  lip)
    (unless (location= result value)
      (inst fmove value result))))

(define-vop (data-vector-ref/simple-array-double-float)
  (:note "inline array access")
  (:translate data-vector-ref)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
	 (index :scs (any-reg)))
  (:arg-types simple-array-double-float positive-fixnum)
  (:results (value :scs (double-reg)))
  (:result-types double-float)
  (:temporary (:scs (interior-reg)) lip)
  (:generator 20
    (inst addq object index lip)
    (inst addq lip index lip)
    (inst ldt value
	  (- (* vector-data-offset word-bytes)
	     other-pointer-type)
	  lip)))

(define-vop (data-vector-set/simple-array-double-float)
  (:note "inline array store")
  (:translate data-vector-set)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
	 (index :scs (any-reg))
	 (value :scs (double-reg) :target result))
  (:arg-types simple-array-double-float positive-fixnum double-float)
  (:results (result :scs (double-reg)))
  (:result-types double-float)
  (:temporary (:scs (interior-reg)) lip)
  (:generator 20
    (inst addq object index lip)
    (inst addq lip index lip)
    (inst stt value
	  (- (* vector-data-offset word-bytes)
	     other-pointer-type) lip)
    (unless (location= result value)
      (inst fmove value result))))


;;; These VOPs are used for implementing float slots in structures (whose raw
;;; data is an unsigned-32 vector.
;;;
(define-vop (raw-ref-single data-vector-ref/simple-array-single-float)
  (:translate %raw-ref-single)
  (:arg-types simple-array-unsigned-byte-32 positive-fixnum))
;;;
(define-vop (raw-set-single data-vector-set/simple-array-single-float)
  (:translate %raw-set-single)
  (:arg-types simple-array-unsigned-byte-32 positive-fixnum single-float))
;;;
(define-vop (raw-ref-double data-vector-ref/simple-array-double-float)
  (:translate %raw-ref-double)
  (:arg-types simple-array-unsigned-byte-32 positive-fixnum))
;;;
(define-vop (raw-set-double data-vector-set/simple-array-double-float)
  (:translate %raw-set-double)
  (:arg-types simple-array-unsigned-byte-32 positive-fixnum double-float))


;;; These vops are useful for accessing the bits of a vector irrespective of
;;; what type of vector it is.
;;; 

(define-full-reffer raw-bits * 0 other-pointer-type (unsigned-reg) unsigned-num
  %raw-bits)
(define-full-setter set-raw-bits * 0 other-pointer-type (unsigned-reg)
  unsigned-num %set-raw-bits #+gengc nil)



;;;; Misc. Array VOPs.

(define-vop (get-vector-subtype get-header-data))
(define-vop (set-vector-subtype set-header-data))

