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AP_Math: memcpy nanfs rather than iteratively setting them

This commit is contained in:
Peter Barker 2021-11-29 23:03:38 +11:00 committed by Andrew Tridgell
parent b32b31aecd
commit 99b1659e4b
1 changed files with 36 additions and 1 deletions
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37
libraries/AP_Math/AP_Math.cpp
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@ -399,23 +399,58 @@ float calc_lowpass_alpha_dt(float dt, float cutoff_freq)
return constrain_float(dt/(dt+rc), 0.0f, 1.0f);
}
#ifndef AP_MATH_FILL_NANF_USE_MEMCPY
#define AP_MATH_FILL_NANF_USE_MEMCPY (CONFIG_HAL_BOARD == HAL_BOARD_SITL)
#endif
#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
// fill an array of float with NaN, used to invalidate memory in SITL
void fill_nanf(float *f, uint16_t count)
{
#if AP_MATH_FILL_NANF_USE_MEMCPY
static bool created;
static float many_nanfs[2048];
if (!created) {
for (uint16_t i=0; i<ARRAY_SIZE(many_nanfs); i++) {
created = true;
many_nanfs[i] = std::numeric_limits<float>::signaling_NaN();
}
}
if (count > ARRAY_SIZE(many_nanfs)) {
AP_HAL::panic("Too big an area to fill");
}
memcpy(f, many_nanfs, count*sizeof(many_nanfs[0]));
#else
const float n = std::numeric_limits<float>::signaling_NaN();
while (count--) {
*f++ = n;
}
#endif
}
void fill_nanf(double *f, uint16_t count)
{
#if AP_MATH_FILL_NANF_USE_MEMCPY
static bool created;
static double many_nanfs[2048];
if (!created) {
for (uint16_t i=0; i<ARRAY_SIZE(many_nanfs); i++) {
created = true;
many_nanfs[i] = std::numeric_limits<double>::signaling_NaN();
}
}
if (count > ARRAY_SIZE(many_nanfs)) {
AP_HAL::panic("Too big an area to fill");
}
memcpy(f, many_nanfs, count*sizeof(many_nanfs[0]));
#else
while (count--) {
*f++ = std::numeric_limits<double>::signaling_NaN();
}
}
#endif
}
#endif // CONFIG_HAL_BOARD == HAL_BOARD_SITL
// Convert 16-bit fixed-point to float
float fixed2float(const uint16_t input, const uint8_t fractional_bits)