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Slim heap-allocated flonums

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* libguile/numbers.h (struct scm_t_double, struct scm_t_complex): Avoid
  adding an extra padding word on systems with 8-byte pointers.
* module/system/base/types.scm (cell->object): Update to compute correct
  offset of embedded double.
This commit is contained in:
Andy Wingo 2018-04-10 19:54:58 +02:00
parent b9f7621e13
commit 41689edfc3
2 changed files with 7 additions and 3 deletions
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6
libguile/numbers.h
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@ -4,7 +4,7 @@
#define SCM_NUMBERS_H
/* Copyright (C) 1995, 1996, 1998, 2000-2006, 2008-2011, 2013, 2014,
* 2016, 2017 Free Software Foundation, Inc.
* 2016-2018 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
@ -172,14 +172,18 @@ typedef long scm_t_inum;
typedef struct scm_t_double
{
SCM type;
#if SCM_SIZEOF_UINTPTR_T != 8
SCM pad;
#endif
double real;
} scm_t_double;
typedef struct scm_t_complex
{
SCM type;
#if SCM_SIZEOF_UINTPTR_T != 8
SCM pad;
#endif
double real;
double imag;
} scm_t_complex;

4
module/system/base/types.scm
View file

@ -1,5 +1,5 @@
;;; 'SCM' type tag decoding.
;;; Copyright (C) 2014, 2015, 2017 Free Software Foundation, Inc.
;;; Copyright (C) 2014, 2015, 2017, 2018 Free Software Foundation, Inc.
;;;
;;; This library is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU Lesser General Public License as published by
@ -419,7 +419,7 @@ using BACKEND."
(((_ & #xffff = %tc16-bignum))
(inferior-object 'bignum address))
(((_ & #xffff = %tc16-flonum) pad)
(let* ((address (+ address (* 2 %word-size)))
(let* ((address (+ address (match %word-size (4 8) (8 8))))
(port (memory-port backend address (sizeof double)))
(words (get-bytevector-n port (sizeof double))))
(bytevector-ieee-double-ref words 0 (native-endianness))))