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nimble/ll: Optimize num used channels calculation

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popcount calculates number of bits set without loop.
This commit is contained in:
Andrzej Kaczmarek
2023-02-03 00:11:16 +01:00
parent f5c918d1b5
commit c995fe4fc4
1 changed files with 2 additions and 15 deletions
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nimble/controller/src/ble_ll_utils.c
+2 -15
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@@ -253,21 +253,8 @@ ble_ll_utils_remapped_channel(uint8_t remap_index, const uint8_t *chanmap)
uint8_t
ble_ll_utils_calc_num_used_chans(const uint8_t *chan_map)
{
uint32_t u32 = 0;
uint32_t num_used_chans = 0;
unsigned idx;
for (idx = 0; idx < 37; idx++) {
if ((idx % 8) == 0) {
u32 = chan_map[idx / 8];
}
if (u32 & 1) {
num_used_chans++;
}
u32 >>= 1;
}
return num_used_chans;
return __builtin_popcountll(((uint64_t)(chan_map[4] & 0x1f) << 32) |
get_le32(chan_map));
}
#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_CSA2)