| 1 | /* Copyright (C) 2012 Matthew Fluet. |
| 2 | * Copyright (C) 1999-2006 Henry Cejtin, Matthew Fluet, Suresh |
| 3 | * Jagannathan, and Stephen Weeks. |
| 4 | * Copyright (C) 1997-2000 NEC Research Institute. |
| 5 | * |
| 6 | * MLton is released under a BSD-style license. |
| 7 | * See the file MLton-LICENSE for details. |
| 8 | */ |
| 9 | |
| 10 | static inline bool isBigEndian(void) { |
| 11 | uint16_t x = 0xABCDU; |
| 12 | uint8_t y = 0; |
| 13 | /* gcc optimizes the following code to just return the result. */ |
| 14 | memcpy(&y, &x, sizeof(uint8_t)); |
| 15 | if (y == 0xAB) return TRUE; /* big endian */ |
| 16 | if (y == 0xCD) return FALSE; /* little endian */ |
| 17 | die ("Could not detect endian --- neither big nor little!\n"); |
| 18 | // return 0; |
| 19 | } |
| 20 | |
| 21 | static inline bool isLittleEndian(void) { |
| 22 | return not (isBigEndian()); |
| 23 | } |