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Improve rt ffs providing another find least non-0 bit position method with no memory requirement #9729

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Improve rt ffs providing another find least non-0 bit position method with no memory requirement #9729

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dfb7df4
Punny __rt_ffs() does not use extra space
pegasusplus Nov 30, 2024
ef1fd2c
Update Kconfig for puny __rt_ffs()
pegasusplus Nov 30, 2024
9fd71b3
Format code
pegasusplus Nov 30, 2024
60f5f0e
Update manual_dist.yml to default select RT_USING_PUNY_FFS
pegasusplus Nov 30, 2024
a063f50
Format code
pegasusplus Dec 1, 2024
0e9c6c8
Fix legacy __rt_ffs_tiny()
pegasusplus Dec 1, 2024
96a6d04
typo
pegasusplus Dec 1, 2024
4ba2594
Using builtin ctz instruction to calculate ffs, GCC/KEIL/IAR
pegasusplus Dec 2, 2024
1118c96
rt_int32_t -> int
pegasusplus Dec 2, 2024
e41a3af
RevokeRevoke manual_dist.yml
pegasusplus Dec 3, 2024
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Format code
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@pegasusplus
pegasusplus authored Dec 1, 2024
commit a063f50568d59d5cc61e45b4216b5a1f04d14ecd
4 changes: 2 additions & 2 deletions src/kservice.c
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Expand Up @@ -1029,12 +1029,12 @@ RTM_EXPORT(rt_free_align);
#ifdef RT_USING_PUNY_FFS
int __rt_ffs(rt_int32_t value) {
int position = 1; // position start from 1

if (value == 0)
{
return 0; // 0 means no bit 1
}

// search half range
if ((value & 0xFFFF) == 0)
{
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