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;; This file is part of JACC and is licenced under terms contained in the COPYING file
;;
;; Copyright (C) 2021 Barcelona Supercomputing Center (BSC)
(define-module pass0
(use util)
(use xm)
(use srfi-11)
(use srfi-13)
(use util.match)
(use sxml.tools)
(use sxml.sxpath)
(use gauche.collection)
(export
pass0
))
(select-module pass0)
;;;
;;; PASS0
;;;
;;; Transform ACCPragma into the form supported by macc.
;;;
;;; - KERNELS_LOOP => KERNELS & LOOP
;;; - PARALLEL_LOOP => PARALLEL & LOOP
;;;
;;; - (KERNELS|PARALLEL) COPYIN => DATA & (KERNELS|PARALLEL)
;;; - KERNELS => PARALLEL
;;;
(define-syntax define-clauses-separater
(syntax-rules ()
[(_ name pat)
(define name
(lambda (clauses)
(let loop ([cl1 '(list)] [cl2 '(list)] [clauses (cdr clauses)])
(if (null? clauses)
(values (reverse cl1) (reverse cl2))
(match-let1 (head . rest) clauses
(match1 ((ccc-sxpath "string") head) pat
(loop (cons head cl1) cl2 rest)
(loop cl1 (cons head cl2) rest)
))))))]
))
(define-clauses-separater separate-acc-*-loop-clauses
(or "ASYNC"
"WAIT"
"DEVICE_TYPE"
"IF"
"REDUCTION_PLUS"
"REDUCTION_MINUS"
"REDUCTION_MUL"
"REDUCTION_BITAND"
"REDUCTION_BITOR"
"REDUCTION_BITXOR"
"REDUCTION_LOGAND"
"REDUCTION_LOGOR"
"REDUCTION_MIN"
"REDUCTION_MAX"
"COPY"
"COPYIN"
"COPYOUT"
"CREATE"
"PRESENT"
"PRESENT_OR_COPY"
"PRESENT_OR_COPYIN"
"PRESENT_OR_COPYOUT"
"PRESENT_OR_CREATE"
"DEVICEPTR"
"PRIVATE"
"FIRSTPRIVATE"
"DEFAULT"
"NUM_GANGS"
"NUM_WORKERS"
"VECT_LEN"
))
(define (split-acc-*-loop! state)
(match-let1 (('string dirname) clauses body) (sxml:content state)
(let-values ([(cl1 cl2) (separate-acc-*-loop-clauses clauses)])
(sxml:change-content! state
`((string ,(string-drop-right dirname 5))
,cl1
(ACCPragma
(string "LOOP")
,cl2
,body)))
)))
(define-clauses-separater separate-acc-data-clauses
(or "COPY"
"COPYIN"
"COPYOUT"
"CREATE"
"DEVICEPTR"
"PRESENT"
"PRESENT_OR_COPY"
"PRESENT_OR_COPYIN"
"PRESENT_OR_COPYOUT"
"PRESENT_OR_CREATE"))
(define (split-acc-data-clauses! state)
(match-let1 (('string dirname) clauses body) (sxml:content state)
(let-values ([(cl1 cl2) (separate-acc-data-clauses clauses)])
(when (> (length cl1) 1)
(sxml:change-content!
state
`((string "DATA")
,cl1
(ACCPragma (string ,dirname) ,cl2 ,body)))
))))
(define (translate-acc-kernels! state)
(sxml:change! state (translate-acc-kernels state)))
(define (translate-acc-kernels state :optional (clauses '(list)))
(cond [(not (sxml:element? state)) state]
[(eq? (sxml:name state) 'ACCPragma)
(match-let1 (('string dirname) cl body) (sxml:content state)
(if (equal? dirname "KERNELS")
;; KERNELS
(translate-acc-kernels body (append clauses (cdr cl)))
;; LOOP
(attach-parallel state clauses)))]
[else
(if (parallel-attachable? state)
(attach-parallel state clauses)
(sxml:change-content
state
(map (cut translate-acc-kernels <> clauses)
(sxml:content state))))]))
(define (parallel-attachable? state)
(and (parallel-attachable-form? state)
(parallel-attachable-dependency? state)))
(define (parallel-attachable-form? state)
(let1 state-name (sxml:name state)
(and (or (eq? state-name 'forStatement)
(eq? state-name 'compoundStatement))
(let1 body-content ((content-car-sxpath "body") state)
(or (every have-no-loop? body-content)
(and (= (length body-content) 1)
(let1 body-head (~ body-content 0)
(if (eq? (sxml:name body-head) 'ACCPragma) #t
(parallel-attachable-form? body-head))))
)))))
(define (have-no-loop? state)
(null?
((node-all
(ntype-names?? '(forStatement doStatement whileStatement functionCall)))
state)))
(define (parallel-attachable-dependency? state)
(and-let*
([for-states ((node-all (ntype?? 'forStatement)) state)]
[(pair? for-states)]
;; Each forStatement must have valid iteration
[(every (.$ pair? extract-loop-counters) for-states)]
;; state of innermost forStatement
[innermost-body ((car-sxpath "body") (last for-states))]
[assigns ((node-all (ntype?? 'assignExpr)) innermost-body)]
[arrayrefs ((node-all (ntype?? 'arrayRef)) innermost-body)]
[group-indexes
(lambda (indexes)
(map
(lambda (k) (cons (caar k) (map cdr k)))
(group-collection indexes :key car :test string=?)))]
[indexes-set
(group-indexes
(map
(lambda (ar)
(match-let1 (addr index) (sxml:content ar)
(cons (sxml:car-content addr) index)))
arrayrefs))]
[all-write-indexes
(map
(lambda (as)
(match-let1 (lv _) (sxml:content as)
(and
(eq? (sxml:name lv) 'arrayRef)
(match-let1 (addr index) (sxml:content lv)
(cons (sxml:car-content addr) index)))))
assigns)]
;; All assignments must be to array elements
;; TODO: iterative data-flow analysis for more accuracy
[(every values all-write-indexes)]
[write-indexes-set (group-indexes all-write-indexes)])
(every
(lambda (indexes)
(match-let1 (var . vals) indexes
(let1 write-indexes-vals (assoc-ref write-indexes-set var)
(or
;; read only
(not write-indexes-vals)
;; write only
(= (length vals) (length write-indexes-vals))
;; all vals are same
;; TODO: normalize expression of vals
(= (length (delete-duplicates vals)) 1)
))))
indexes-set)
))
(define (attach-parallel state clauses)
(let1 clauses (append clauses (collect-parallel-size! state))
`(ACCPragma
(string "PARALLEL")
,clauses
,state)))
(define (collect-parallel-size! state)
(filter-map
(lambda (c)
(let ([content (sxml:content c)]
[parname ((car-sxpath '(// string *text*)) c)])
(and (= (length content) 2)
(sxml:change-content! c `(,(~ content 0)))
`(list
(string
,(if (equal? parname "VECTOR") "VECT_LEN" #"NUM_~|parname|S"))
,(~ content 1))
)))
((sxpath
`(// (list (string *text* ,(make-sxpath-query #/^(GANG|WORKER|VECTOR)$/)))))
state)))
(define-clauses-separater separate-acc-parallelism-clauses
(or "NUM_GANGS"
"NUM_WORKERS"
"VECT_LEN"))
(define (remove-parallelism-clauses! state)
(match-let1 (_ clauses _) (sxml:content state)
(let-values ([(_ new-clauses) (separate-acc-parallelism-clauses clauses)])
(sxml:change-content! clauses (cdr new-clauses))
)))
(define (divide-gangs-by-numgpus! state)
(map
(lambda (c)
(let1 content (sxml:content c)
(sxml:change-content!
c
`(,(~ content 0)
(condExpr
(Var "__macc_multi")
(divExpr
(minusExpr
(plusExpr ,(~ content 1) (Var "__MACC_NUMGPUS"))
(intConstant "1"))
(Var "__MACC_NUMGPUS"))
,(~ content 1)))
)))
((sxpath
`(// (list (string *text* ,(make-sxpath-query #/^NUM_GANGS$/)))))
state)))
(define (pass0 xm)
(rlet1 xm (xm-copy xm)
(let* ([decls (xm-global-declarations xm)]
[acc-trans!
(lambda (proc pred?)
(for-each proc ((sxpath `(// (ACCPragma (string *text* ,(make-sxpath-query pred?))))) decls)))])
(acc-trans! split-acc-*-loop! #/^(KERNELS|PARALLEL)_LOOP$/)
(acc-trans! split-acc-data-clauses! #/^(KERNELS|PARALLEL)$/)
(acc-trans! translate-acc-kernels! #/^KERNELS$/)
)))