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1999-01-02
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#| -*-Scheme-*-
$Id: machin.scm,v 1.15 1999/01/02 06:06:43 cph Exp $
Copyright (c) 1988-1999 Massachusetts Institute of Technology
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|#
;;;; Machine Model for MIPS
;;; package: (compiler)
(declare (usual-integrations))
;;;; Architecture Parameters
(define use-pre/post-increment? false)
(define endianness 'LITTLE)
(define-integrable addressing-granularity 8)
(define-integrable scheme-object-width 32)
(define-integrable scheme-type-width 6) ;or 8
(define-integrable type-scale-factor (expt 2 (- 8 scheme-type-width)))
(define-integrable scheme-datum-width
(- scheme-object-width scheme-type-width))
(define-integrable float-width 64)
(define-integrable float-alignment 64)
(define-integrable address-units-per-float
(quotient float-width addressing-granularity))
;;; It is currently required that both packed characters and objects
;;; be integrable numbers of address units. Furthermore, the number
;;; of address units per object must be an integral multiple of the
;;; number of address units per character. This will cause problems
;;; on a machine that is word addressed, in which case we will have to
;;; rethink the character addressing strategy.
(define-integrable address-units-per-object
(quotient scheme-object-width addressing-granularity))
(define-integrable address-units-per-packed-char 1)
(define-integrable signed-fixnum/upper-limit (expt 2 (-1+ scheme-datum-width)))
(define-integrable signed-fixnum/lower-limit (- signed-fixnum/upper-limit))
(define-integrable unsigned-fixnum/upper-limit (* 2 signed-fixnum/upper-limit))
(define-integrable (stack->memory-offset offset) offset)
(define-integrable ic-block-first-parameter-offset 2)
(define-integrable execute-cache-size 2) ; Long words per UUO link slot
(define-integrable closure-entry-size
;; Long words in a single closure entry:
;; Format + GC offset word
;; JALR/JAL
;; ADDI
3)
;; Given: the number of entry points in a closure, and a particular
;; entry point number. Return: the distance from that entry point to
;; the first variable slot in the closure (in words).
(define (closure-first-offset nentries entry)
(if (zero? nentries)
1 ; Strange boundary case
(- (* closure-entry-size (- nentries entry)) 1)))
;; Like the above, but from the start of the complete closure object,
;; viewed as a vector, and including the header word.
(define (closure-object-first-offset nentries)
(case nentries
((0)
;; Vector header only
1)
((1)
;; Manifest closure header followed by single entry point
(+ 1 closure-entry-size))
(else
;; Manifest closure header, number of entries, then entries.
(+ 1 1 (* closure-entry-size nentries)))))
;; Bump from one entry point to another -- distance in BYTES
(define (closure-entry-distance nentries entry entry*)
nentries ; ignored
(* (* closure-entry-size 4) (- entry* entry)))
;; Bump to the canonical entry point. On a RISC (which forces
;; longword alignment for entry points anyway) there is no need to
;; canonicalize.
(define (closure-environment-adjustment nentries entry)
nentries entry ; ignored
0)
;;;; Machine Registers
(define-integrable g0 0)
(define-integrable g1 1)
(define-integrable g2 2)
(define-integrable g3 3)
(define-integrable g4 4)
(define-integrable g5 5)
(define-integrable g6 6)
(define-integrable g7 7)
(define-integrable g8 8)
(define-integrable g9 9)
(define-integrable g10 10)
(define-integrable g11 11)
(define-integrable g12 12)
(define-integrable g13 13)
(define-integrable g14 14)
(define-integrable g15 15)
(define-integrable g16 16)
(define-integrable g17 17)
(define-integrable g18 18)
(define-integrable g19 19)
(define-integrable g20 20)
(define-integrable g21 21)
(define-integrable g22 22)
(define-integrable g23 23)
(define-integrable g24 24)
(define-integrable g25 25)
(define-integrable g26 26)
(define-integrable g27 27)
(define-integrable g28 28)
(define-integrable g29 29)
(define-integrable g30 30)
(define-integrable g31 31)
;; Floating point general registers -- the odd numbered ones are
;; only used when transferring to/from the CPU
(define-integrable fp0 32)
(define-integrable fp1 33)
(define-integrable fp2 34)
(define-integrable fp3 35)
(define-integrable fp4 36)
(define-integrable fp5 37)
(define-integrable fp6 38)
(define-integrable fp7 39)
(define-integrable fp8 40)
(define-integrable fp9 41)
(define-integrable fp10 42)
(define-integrable fp11 43)
(define-integrable fp12 44)
(define-integrable fp13 45)
(define-integrable fp14 46)
(define-integrable fp15 47)
(define-integrable fp16 48)
(define-integrable fp17 49)
(define-integrable fp18 50)
(define-integrable fp19 51)
(define-integrable fp20 52)
(define-integrable fp21 53)
(define-integrable fp22 54)
(define-integrable fp23 55)
(define-integrable fp24 56)
(define-integrable fp25 57)
(define-integrable fp26 58)
(define-integrable fp27 59)
(define-integrable fp28 60)
(define-integrable fp29 61)
(define-integrable fp30 62)
(define-integrable fp31 63)
(define-integrable number-of-machine-registers 63)
(define-integrable number-of-temporary-registers 256)
;;; Fixed-use registers for Scheme compiled code.
(define-integrable regnum:return-value g2)
(define-integrable regnum:stack-pointer g3)
(define-integrable regnum:memtop g8)
(define-integrable regnum:free g9)
(define-integrable regnum:scheme-to-interface g10)
(define-integrable regnum:dynamic-link g11)
(define-integrable regnum:closure-free g19)
(define-integrable regnum:address-mask g20)
(define-integrable regnum:regs-pointer g21)
(define-integrable regnum:quad-bits g22)
(define-integrable regnum:closure-hook g23)
(define-integrable regnum:interface-index g25)
;;; Fixed-use registers due to architecture or OS calling conventions.
(define-integrable regnum:zero g0)
(define-integrable regnum:assembler-temp g1)
(define-integrable regnum:C-return-value g2)
(define-integrable regnum:first-arg g4)
(define-integrable regnum:second-arg g5)
(define-integrable regnum:third-arg g6)
(define-integrable regnum:fourth-arg g7)
(define-integrable regnum:kernel-reserved-1 g26)
(define-integrable regnum:kernel-reserved-2 g27)
(define-integrable regnum:C-global-pointer g28)
(define-integrable regnum:C-stack-pointer g29)
(define-integrable regnum:linkage g31)
(define machine-register-value-class
(let ((special-registers
`((,regnum:return-value . ,value-class=object)
(,regnum:stack-pointer . ,value-class=address)
(,regnum:memtop . ,value-class=address)
(,regnum:free . ,value-class=address)
(,regnum:scheme-to-interface . ,value-class=unboxed)
(,regnum:closure-hook . ,value-class=unboxed)
(,regnum:closure-free . ,value-class=unboxed)
(,regnum:dynamic-link . ,value-class=address)
(,regnum:address-mask . ,value-class=immediate)
(,regnum:regs-pointer . ,value-class=unboxed)
(,regnum:quad-bits . ,value-class=immediate)
(,regnum:assembler-temp . ,value-class=unboxed)
(,regnum:kernel-reserved-1 . ,value-class=unboxed)
(,regnum:kernel-reserved-2 . ,value-class=unboxed)
(,regnum:C-global-pointer . ,value-class=unboxed)
(,regnum:C-stack-pointer . ,value-class=unboxed)
(,regnum:linkage . ,value-class=address))))
(lambda (register)
(let ((lookup (assv register special-registers)))
(cond
((not (null? lookup)) (cdr lookup))
((<= g0 register g31) value-class=word)
((<= fp0 register fp31) value-class=float)
(else (error "illegal machine register" register)))))))
(define-integrable (machine-register-known-value register)
register ;ignore
false)
;;;; Interpreter Registers
(define-integrable (interpreter-free-pointer)
(rtl:make-machine-register regnum:free))
(define (interpreter-free-pointer? expression)
(and (rtl:register? expression)
(= (rtl:register-number expression) regnum:free)))
(define-integrable (interpreter-regs-pointer)
(rtl:make-machine-register regnum:regs-pointer))
(define (interpreter-regs-pointer? expression)
(and (rtl:register? expression)
(= (rtl:register-number expression) regnum:regs-pointer)))
(define-integrable (interpreter-value-register)
(rtl:make-machine-register regnum:return-value))
(define (interpreter-value-register? expression)
(and (rtl:register? expression)
(= (rtl:register-number expression) regnum:return-value)))
(define-integrable (interpreter-stack-pointer)
(rtl:make-machine-register regnum:stack-pointer))
(define (interpreter-stack-pointer? expression)
(and (rtl:register? expression)
(= (rtl:register-number expression) regnum:stack-pointer)))
(define-integrable (interpreter-dynamic-link)
(rtl:make-machine-register regnum:dynamic-link))
(define (interpreter-dynamic-link? expression)
(and (rtl:register? expression)
(= (rtl:register-number expression) regnum:dynamic-link)))
(define-integrable (interpreter-environment-register)
(rtl:make-offset (interpreter-regs-pointer)
(rtl:make-machine-constant 3)))
(define (interpreter-environment-register? expression)
(and (rtl:offset? expression)
(interpreter-regs-pointer? (rtl:offset-base expression))
(let ((offset (rtl:offset-offset expression)))
(and (rtl:machine-constant? offset)
(= 3 (rtl:machine-constant-value offset))))))
(define-integrable (interpreter-register:access)
(rtl:make-machine-register regnum:C-return-value))
(define-integrable (interpreter-register:cache-reference)
(rtl:make-machine-register regnum:C-return-value))
(define-integrable (interpreter-register:cache-unassigned?)
(rtl:make-machine-register regnum:C-return-value))
(define-integrable (interpreter-register:lookup)
(rtl:make-machine-register regnum:C-return-value))
(define-integrable (interpreter-register:unassigned?)
(rtl:make-machine-register regnum:C-return-value))
(define-integrable (interpreter-register:unbound?)
(rtl:make-machine-register regnum:C-return-value))
;;;; RTL Registers, Constants, and Primitives
(define (rtl:machine-register? rtl-register)
(case rtl-register
((STACK-POINTER)
(interpreter-stack-pointer))
((DYNAMIC-LINK)
(interpreter-dynamic-link))
((VALUE)
(interpreter-value-register))
((MEMORY-TOP)
(rtl:make-machine-register regnum:memtop))
((FREE)
(interpreter-free-pointer))
((INTERPRETER-CALL-RESULT:ACCESS)
(interpreter-register:access))
((INTERPRETER-CALL-RESULT:CACHE-REFERENCE)
(interpreter-register:cache-reference))
((INTERPRETER-CALL-RESULT:CACHE-UNASSIGNED?)
(interpreter-register:cache-unassigned?))
((INTERPRETER-CALL-RESULT:LOOKUP)
(interpreter-register:lookup))
((INTERPRETER-CALL-RESULT:UNASSIGNED?)
(interpreter-register:unassigned?))
((INTERPRETER-CALL-RESULT:UNBOUND?)
(interpreter-register:unbound?))
(else false)))
(define (rtl:interpreter-register? rtl-register)
(case rtl-register
((INT-MASK) 1)
((ENVIRONMENT) 3)
((TEMPORARY) 4)
(else false)))
(define (rtl:interpreter-register->offset locative)
(or (rtl:interpreter-register? locative)
(error "Unknown register type" locative)))
(define (rtl:constant-cost expression)
;; Magic numbers.
(let ((if-integer
(lambda (value)
(cond ((zero? value) 1)
((or (fits-in-16-bits-signed? value)
(fits-in-16-bits-unsigned? value)
(top-16-bits-only? value))
2)
(else 3)))))
(let ((if-synthesized-constant
(lambda (type datum)
(if-integer (make-non-pointer-literal type datum)))))
(case (rtl:expression-type expression)
((CONSTANT)
(let ((value (rtl:constant-value expression)))
(if (non-pointer-object? value)
(if-synthesized-constant (object-type value)
(object-datum value))
3)))
((MACHINE-CONSTANT)
(if-integer (rtl:machine-constant-value expression)))
((ENTRY:PROCEDURE ENTRY:CONTINUATION
ASSIGNMENT-CACHE VARIABLE-CACHE
OFFSET-ADDRESS BYTE-OFFSET-ADDRESS FLOAT-OFFSET-ADDRESS)
3)
((CONS-NON-POINTER)
(and (rtl:machine-constant? (rtl:cons-non-pointer-type expression))
(rtl:machine-constant? (rtl:cons-non-pointer-datum expression))
(if-synthesized-constant
(rtl:machine-constant-value
(rtl:cons-non-pointer-type expression))
(rtl:machine-constant-value
(rtl:cons-non-pointer-datum expression)))))
(else false)))))
(define compiler:open-code-floating-point-arithmetic?
true)
(define compiler:primitives-with-no-open-coding
'(DIVIDE-FIXNUM GCD-FIXNUM FIXNUM-QUOTIENT FIXNUM-REMAINDER
INTEGER-QUOTIENT INTEGER-REMAINDER &/ QUOTIENT REMAINDER
FLONUM-SIN FLONUM-COS FLONUM-TAN FLONUM-ASIN FLONUM-ACOS FLONUM-ATAN2
FLONUM-ATAN FLONUM-EXP FLONUM-LOG FLONUM-REMAINDER FLONUM-SQRT
FLONUM-TRUNCATE FLONUM-ROUND FLONUM-CEILING FLONUM-FLOOR
VECTOR-CONS STRING-ALLOCATE FLOATING-VECTOR-CONS))