projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 952fd448 WJ |
1 | /* Front-end tree definitions for GNU compiler. |
| 2 | Copyright (C) 1989 Free Software Foundation, Inc. | |
| 3 | ||
| 4 | This file is part of GNU CC. | |
| 5 | ||
| 6 | GNU CC is free software; you can redistribute it and/or modify | |
| 7 | it under the terms of the GNU General Public License as published by | |
| 8 | the Free Software Foundation; either version 1, or (at your option) | |
| 9 | any later version. | |
| 10 | ||
| 11 | GNU CC is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | GNU General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU General Public License | |
| 17 | along with GNU CC; see the file COPYING. If not, write to | |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
| 19 | ||
| 20 | #ifndef REAL_H_INCLUDED | |
| 21 | #define REAL_H_INCLUDED | |
| 22 | ||
| 23 | /* If we are not cross-compiling, use a `double' to represent the | |
| 24 | floating-point value. Otherwise, use some other type | |
| 25 | (probably a struct containing an array of longs). */ | |
| 26 | #ifndef REAL_VALUE_TYPE | |
| 27 | #define REAL_VALUE_TYPE double | |
| 28 | #else | |
| 29 | #define REAL_IS_NOT_DOUBLE | |
| 30 | #endif | |
| 31 | ||
| 32 | /* Compare two floating-point values for equality. */ | |
| 33 | #ifndef REAL_VALUES_EQUAL | |
| 34 | #define REAL_VALUES_EQUAL(x,y) ((x) == (y)) | |
| 35 | #endif | |
| 36 | ||
| 37 | /* Compare two floating-point values for less than. */ | |
| 38 | #ifndef REAL_VALUES_LESS | |
| 39 | #define REAL_VALUES_LESS(x,y) ((x) < (y)) | |
| 40 | #endif | |
| 41 | ||
| 42 | /* Scale X by Y powers of 2. */ | |
| 43 | #ifndef REAL_VALUE_LDEXP | |
| 44 | #define REAL_VALUE_LDEXP(x,y) ldexp (x, y) | |
| 45 | extern double ldexp (); | |
| 46 | #endif | |
| 47 | ||
| 48 | /* Convert the string X to a floating-point value. */ | |
| 49 | #ifndef REAL_VALUE_ATOF | |
| 50 | #define REAL_VALUE_ATOF(x) atof (x) | |
| 51 | extern double atof (); | |
| 52 | #endif | |
| 53 | ||
| 54 | /* Negate the floating-point value X. */ | |
| 55 | #ifndef REAL_VALUE_NEGATE | |
| 56 | #define REAL_VALUE_NEGATE(x) (- (x)) | |
| 57 | #endif | |
| 58 | ||
| 59 | /* Truncate the floating-point value X to single-precision. */ | |
| 60 | #ifndef REAL_VALUE_TRUNCATE | |
| 61 | #define REAL_VALUE_TRUNCATE(x) ((float) (x)) | |
| 62 | #endif | |
| 63 | ||
| 64 | /* Union type used for extracting real values from CONST_DOUBLEs | |
| 65 | or putting them in. */ | |
| 66 | ||
| 67 | union real_extract | |
| 68 | { | |
| 69 | REAL_VALUE_TYPE d; | |
| 70 | int i[sizeof (REAL_VALUE_TYPE) / sizeof (int)]; | |
| 71 | }; | |
| 72 | ||
| 73 | /* For a CONST_DOUBLE: | |
| 74 | The usual two ints that hold the value. | |
| 75 | For a DImode, that is all there are; | |
| 76 | and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order. | |
| 77 | For a float, the number of ints varies, | |
| 78 | and CONST_DOUBLE_LOW is the one that should come first *in memory*. | |
| 79 | So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */ | |
| 80 | #define CONST_DOUBLE_LOW(r) XINT (r, 2) | |
| 81 | #define CONST_DOUBLE_HIGH(r) XINT (r, 3) | |
| 82 | ||
| 83 | /* Link for chain of all CONST_DOUBLEs in use in current function. */ | |
| 84 | #define CONST_DOUBLE_CHAIN(r) XEXP (r, 1) | |
| 85 | /* The MEM which represents this CONST_DOUBLE's value in memory, | |
| 86 | or const0_rtx if no MEM has been made for it yet, | |
| 87 | or cc0_rtx if it is not on the chain. */ | |
| 88 | #define CONST_DOUBLE_MEM(r) XEXP (r, 0) | |
| 89 | ||
| 90 | /* Function to return a real value (not a tree node) | |
| 91 | from a given integer constant. */ | |
| 92 | REAL_VALUE_TYPE real_value_from_int_cst (); | |
| 93 | ||
| 94 | #endif /* Not REAL_H_INCLUDED */ |