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- #| -*-Scheme-*-
-
- $Id: rules2.scm,v 4.15 1999/01/02 06:06:43 cph Exp $
- $MC68020-Header: rules2.scm,v 4.12 90/01/18 22:44:04 GMT 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.
- |#
-
- ;;;; LAP Generation Rules: Predicates
-
- (declare (usual-integrations))
-
- (define-rule predicate
- ;; test for two registers EQ?
- (EQ-TEST (REGISTER (? source1)) (REGISTER (? source2)))
- (compare '= (standard-source! source1) (standard-source! source2)))
-
- (define-rule predicate
- (EQ-TEST (MACHINE-CONSTANT 0) (REGISTER (? register)))
- (compare-immediate '= 0 (standard-source! register)))
-
- (define-rule predicate
- (EQ-TEST (REGISTER (? register)) (MACHINE-CONSTANT 0))
- (compare-immediate '= 0 (standard-source! register)))
-
- (define-rule predicate
- ;; test for register EQ? to constant
- (EQ-TEST (CONSTANT (? constant)) (REGISTER (? register)))
- (eq-test/constant*register constant register))
-
- (define-rule predicate
- ;; test for register EQ? to constant
- (EQ-TEST (REGISTER (? register)) (CONSTANT (? constant)))
- (eq-test/constant*register constant register))
-
- (define (eq-test/constant*register constant source)
- (let ((source (standard-source! source)))
- (if (non-pointer-object? constant)
- (compare-immediate '= (non-pointer->literal constant) source)
- (let ((temp (standard-temporary!)))
- (LAP ,@(load-constant constant temp)
- ,@(compare '= temp source))))))
-
- (define-rule predicate
- ;; test for register EQ? to synthesized constant
- (EQ-TEST (CONS-POINTER (MACHINE-CONSTANT (? type))
- (MACHINE-CONSTANT (? datum)))
- (REGISTER (? register)))
- (eq-test/synthesized-constant*register type datum register))
-
- (define-rule predicate
- ;; test for register EQ? to synthesized constant
- (EQ-TEST (REGISTER (? register))
- (CONS-POINTER (MACHINE-CONSTANT (? type))
- (MACHINE-CONSTANT (? datum))))
- (eq-test/synthesized-constant*register type datum register))
-
- (define (eq-test/synthesized-constant*register type datum source)
- (compare-immediate '=
- (make-non-pointer-literal type datum)
- (standard-source! source)))
-
- (define-rule predicate
- ;; Branch if virtual register contains the specified type number
- (TYPE-TEST (REGISTER (? register)) (? type))
- (compare-immediate '= type (standard-source! register)))
-
-
- ;; Combine tests for fixnum and non-negative by extracting the type
- ;; bits and the sign bit.
-
- (define-rule predicate
- (PRED-1-ARG INDEX-FIXNUM?
- (REGISTER (? source)))
- (let ((src (standard-source! source)))
- (let ((temp (standard-temporary!)))
- (LAP (EXTRU () ,src ,(- scheme-type-width 0) ,(+ scheme-type-width 1)
- ,temp)
- ,@(compare-immediate '= (* 2 (ucode-type fixnum)) temp)))))
-