You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
2.6 KiB
69 lines
2.6 KiB
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2023 Damien P. George
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include <math.h>
|
|
#include <stdint.h>
|
|
|
|
#define INF_POS (0x7f800000)
|
|
#define INF_NEG (0xff800000)
|
|
|
|
union float_int_t {
|
|
float f;
|
|
uint32_t i;
|
|
};
|
|
|
|
float __wrap___aeabi_fadd(float x, float y);
|
|
|
|
// The pico-sdk wraps __aeabi_fadd() with __wrap___aeabi_fadd() in order to use the ROM
|
|
// floating-point functions. But __wrap___aeabi_fadd() does not handle inf+(-inf) or
|
|
// (-inf)+inf correctly. To fix this we provide our own __aeabi_fadd() that fixes the
|
|
// inf calculation, and do not use the "--wrap=" linker command. The compiler then
|
|
// picks our __aeabi_fadd() instead of its built-in one. And the pico-sdk function
|
|
// still exists for us to call.
|
|
float __aeabi_fadd(float x, float y) {
|
|
// Handle addition of inf/-inf. This is optimised to reduce C stack usage, and
|
|
// only have one comparison/jump in the common case of x != inf.
|
|
union float_int_t xu = {.f = x};
|
|
union float_int_t yu = {.f = y};
|
|
if ((xu.i << 1) == (INF_POS << 1)) {
|
|
if (xu.i == INF_POS) {
|
|
if (yu.i == INF_POS) {
|
|
return INFINITY;
|
|
} else if (yu.i == INF_NEG) {
|
|
return NAN;
|
|
}
|
|
} else {
|
|
if (yu.i == INF_POS) {
|
|
return NAN;
|
|
} else if (yu.i == INF_NEG) {
|
|
return -INFINITY;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Use the pico-sdk function for all other calculations.
|
|
return __wrap___aeabi_fadd(x, y);
|
|
}
|
|
|