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;; innerloop.lsp -- code to generate inner loops from specs
;; the inner loop has a setup, a loop, and a cleanup
;; in the setup, structure fields used in the inner loop are
;; copied or "cached" into register variables
;; in the inner loop, access expressions are substituted for
;; variable names in the spec
;; in the cleanup, resulting register variable "cache" is copied
;; back into the structure fields
(defun compute-inner-loop (alg inner-loop)
(let ((interp (get-slot alg 'interpolation))
(sound-names (get alg 'sound-names))
(state-list (get-slot alg 'state))
(step-function (get alg 'step-function))
(maintain-list (get-slot alg 'maintain))
(constant-list (get-slot alg 'constant))
(force-into-register (get-slot alg 'force-into-register))
(not-register (get-slot alg 'not-register))
register-decl register-init register-cleanup new-state-list
)
;; this loop computes and applies substitutions to the INNER-LOOP spec
(setf inner-loop (substitute inner-loop "output" "*out_ptr_reg++" nil))
(push "\tout_ptr_reg = out_ptr;\n" register-init)
(push "\tout_ptr += togo;\n" register-cleanup)
(dotimes (n (length interp))
(let ((name (nth n sound-names))
interpolate-samples
(method (nth n interp))
expression)
(setf interpolate-samples
(not (member (name-to-symbol name) step-function)))
(cond ((eq method 'NONE)
;-----------------
; NONE:
; <expr> ::= *NAME_ptr_reg++
;-----------------
(pushnew (format nil
" register sample_block_values_type ~A_ptr_reg;~%" name)
register-decl)
(pushnew (format nil
"\t~A_ptr_reg = susp->~A_ptr;~%" name name)
register-init)
(pushnew (format nil
"\t/* using ~A_ptr_reg is a bad idea on RS/6000: */~
~%\tsusp->~A_ptr += togo;~%" name name name)
register-cleanup)
(setf expression (format nil "*~A_ptr_reg++" name)))
((eq method 'SCALE)
;-----------------
; SCALE
; <expr> ::= (NAME_scale_reg * *NAME_ptr_reg++)
;-----------------
(pushnew (format nil
" register sample_block_values_type ~A_ptr_reg;~%" name)
register-decl)
(pushnew (format nil
" register sample_type ~A_scale_reg = susp->~A->scale;~%" name name)
register-decl)
(pushnew (format nil
"\t~A_ptr_reg = susp->~A_ptr;~%" name name)
register-init)
(pushnew (format nil
"\t/* using ~A_ptr_reg is a bad idea on RS/6000: */~
~%\tsusp->~A_ptr += togo;~%" name name name)
register-cleanup)
(setf expression (format nil
"(~A_scale_reg * *~A_ptr_reg++)" name name)))
((and interpolate-samples (eq method 'INTERP))
;-----------------
; INTERP:
; <expr> ::= susp->NAME_x1_sample * (1 -
; susp->NAME_pHaSe +
; susp->NAME_x2_sample * susp->NAME_pHaSe)
;-----------------
(pushnew (format nil
" register sample_type ~A_x1_sample_reg;~%" name)
register-decl)
(pushnew (format nil
" register double ~A_pHaSe_ReG;~%" name)
register-decl)
(pushnew (format nil
" register double ~A_pHaSe_iNcR_rEg = susp->~A_pHaSe_iNcR;~%" name name)
register-decl)
(pushnew (format nil
"\t~A_x1_sample_reg = susp->~A_x1_sample;~%" name name)
register-init)
(pushnew (format nil
"\t~A_pHaSe_ReG = susp->~A_pHaSe;~%" name name)
register-init)
(pushnew (format nil
"\tsusp->~A_x1_sample = ~A_x1_sample_reg;~%" name name)
register-cleanup)
(pushnew (format nil
"\tsusp->~A_pHaSe = ~A_pHaSe_ReG;~%" name name)
register-cleanup)
(setf expression (format nil
"\n\t\t(~A_x1_sample_reg * (1 - ~A_pHaSe_ReG) + ~A_x2_sample * ~A_pHaSe_ReG)"
name name name name)))
((eq method 'INTERP)
;-----------------
; STEP FUNCTION:
; <expr> ::= NAME_x1_sample_reg
;-----------------
(pushnew (format nil
" register sample_type ~A_x1_sample_reg;~%" name)
register-decl)
(pushnew (format nil
" register double ~A_pHaSe_ReG;~%" name)
register-decl)
(pushnew (format nil
" register double ~A_pHaSe_iNcR_rEg = susp->~A_pHaSe_iNcR;~%" name name)
register-decl)
(pushnew (format nil
"\t~A_x1_sample_reg = susp->~A_x1_sample;~%" name name)
register-init)
(pushnew (format nil
"\t~A_pHaSe_ReG = susp->~A_pHaSe;~%" name name)
register-init)
(pushnew (format nil
"\tsusp->~A_x1_sample = ~A_x1_sample_reg;~%" name name)
register-cleanup)
(pushnew (format nil
"\tsusp->~A_pHaSe = ~A_pHaSe_ReG;~%" name name)
register-cleanup)
(setf expression (format nil "~A_x1_sample_reg" name)))
((and interpolate-samples (eq method 'RAMP))
;-----------------
; RAMP:
; <expr> ::= NAME_val
;-----------------
(setf expression (format nil "~A_val" name)))
((eq method 'RAMP)
;-----------------
; RAMP:
; <expr> ::= NAME_val
;-----------------
; this doesn't seem to be used -RBD 7/97
;(pushnew (format nil
;" register sample_type ~A_x1_sample_reg;~%" name)
;register-decl)
(setf expression (format nil "~A_val" name))))
(setf inner-loop (substitute inner-loop name expression nil))))
;; determine the members of state-list that are actually referenced in
;; the inner loop. If not, don't cache the state in registers before
;; starting the loop.
(dolist (state state-list)
(let ((var-name (cadr state)))
(cond ((and (or (string-search var-name inner-loop)
(member (name-to-symbol var-name) force-into-register))
(not (member (name-to-symbol var-name) not-register)))
(push state new-state-list)))))
;; this loop applies substitutions for state variables:
;; the specified state variable name is the cadr of state-list element
;; the state variable <var> is replaced in inner-loop by <var>_reg
(dolist (state new-state-list)
(let ((var-name (cadr state))
maintain)
(pushnew (format nil " register ~A ~A_reg;~%" (car state) var-name)
register-decl)
(pushnew (format nil "\t~A_reg = susp->~A;~%" var-name var-name)
register-init)
(setf maintain (find-maintain-stmt var-name maintain-list))
; (display "find-maintain-stmt returned:" maintain)
(cond (maintain
(pushnew (format nil "\t~A;~%" maintain) register-cleanup))
((not (is-constant-in-inner-loop var-name constant-list))
;(pushnew (format nil "var-name: ~A constant-list: ~A~%" var-name constant-list)
; register-cleanup)
(pushnew (format nil "\tsusp->~A = ~A_reg;~%" var-name var-name)
register-cleanup)))
(setf inner-loop (substitute inner-loop var-name
(format nil "~A_reg" var-name) t))))
;; if the user-written code has a break statement or if the interpolation
;; type is INTERP, we need to write out "togo -= n;" to get an accurate
;; count of how many times we went through the loop. Otherwise don't do it
;; because it makes n a live variable and affects compiler optimization.
(cond ((or (member 'INTERP interp)
(string-search "break" inner-loop))
(push "\ttogo -= n;\n" register-cleanup)))
(put-slot alg inner-loop 'inner-loop-stmts)
(put-slot alg register-decl 'register-decl)
(put-slot alg register-init 'register-init)
(put-slot alg register-cleanup 'register-cleanup)
;-----------------
; WATCH:
;
; show_samples(1,s1,s1_ptr - s1->samples)
;
; Note: this is not right because we need to have the correct
; parameter for s1, but that is part of the s1_ptr++ computation
; so I don't know where to get it...
;-----------------
; (if *WATCH*
; (format stream "\t show_samples(1,s1,s1_ptr - s1_samples);~%")
; )
))
;; find-maintain-list -- find an assignment for variable in a MAINTAIN spec
;;
(defun find-maintain-stmt (var specs)
(let ((spec (assoc var specs :test #'equal)))
(if spec (cadr spec))))
;; is-constant-in-inner-loop -- see if var is in constant-list
;;
(defun is-constant-in-inner-loop (var constant-list)
(member var constant-list :test #'equal))
;; pushnew -- pushes string onto list unless already there
;;
(defmacro pushnew (string var)
`(if (not (member ,string ,var :test #'equal))
(push ,string ,var)))
;;**********
;; substitute -- string substitution
;; Inputs:
;; s - input string
;; pat - pattern
;; repl - replacement for pattern
;; all - T or NIL (T : replace everywhere; NIL : replace once)
;;
;;**********
(defun substitute (s pat repl all)
; (display "substitute" s pat repl)
(let ((p (position s pat))
(l (length pat)))
(cond (p
(strcat (subseq s 0 p) repl
;; the remainder of the string depends on all. If T, then
;; use recursion to continue substitutions:
(cond (all (substitute (subseq s (+ p l)) pat repl all))
(t (subseq s (+ p l))))))
(t s))))
(defun write-inner-loop (alg stream)
(let ((interp (get-slot alg 'interpolation))
(step-function (get alg 'step-function))
(sound-names (get alg 'sound-names))
)
(format stream "~A;~%"
(get-slot alg 'inner-loop-stmts))
(dotimes (n (length interp))
(let ((name (nth n sound-names))
interpolate-samples
(method (nth n interp)))
(setf interpolate-samples
(not (member (name-to-symbol name) step-function)))
(cond ((eq method 'INTERP)
;-----------------
; INTERP:
;
; NAME_pHaSe_ReG += NAME_pHaSe_iNcR_rEg;
;-----------------
(format stream "\t ~A_pHaSe_ReG += ~A_pHaSe_iNcR_rEg;~%"
name name))
((and interpolate-samples (eq method 'RAMP))
;-----------------
; RAMP:
; NAME_val += NAME_DeLtA
;-----------------
(format stream "\t ~A_val += ~A_DeLtA;~%" name name)))))
;----------------------------
; WATCH:
; show_samples(0,out,out_ptr - 1 - out->samples);
;----------------------------
; (if *WATCH*
; (format stream "\t show_samples(0,out,out_ptr - 1 - out->samples);~%"))
;----------------------------
; } while (--n); /* inner loop */
;----------------------------
(format stream "\t} while (--n); /* inner loop */~%~%")))
|
