diff options
| author | Meco Jianting Man <[email protected]> | 2021-03-03 10:46:17 -0600 |
|---|---|---|
| committer | GitHub <[email protected]> | 2021-03-03 10:46:17 -0600 |
| commit | 034046c32ecf8e94f36fc25eb35ec78f6e549da1 (patch) | |
| tree | d99d68d92e76f6b9df8d841462086a107317cb41 /libcpu | |
| parent | fab4c5ebb13fd92273de8727c0f18d53716295ff (diff) | |
| parent | 4a40ba95358139aed460369a91ff995cad2f8ce5 (diff) | |
Merge pull request #23 from RT-Thread/master
pr
Diffstat (limited to 'libcpu')
| -rw-r--r-- | libcpu/arm/cortex-m33/cpuport.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/libcpu/arm/cortex-m33/cpuport.c b/libcpu/arm/cortex-m33/cpuport.c index 42b5798507..41325105d7 100644 --- a/libcpu/arm/cortex-m33/cpuport.c +++ b/libcpu/arm/cortex-m33/cpuport.c @@ -473,17 +473,13 @@ exit #elif defined(__CLANG_ARM) int __rt_ffs(int value) { - __asm volatile( - "CMP r0, #0x00 \n" - "BEQ 1f \n" + if (value == 0) return value; + __asm volatile( "RBIT r0, r0 \n" "CLZ r0, r0 \n" "ADDS r0, r0, #0x01 \n" - "1: \n" - "BX lr \n" - : "=r"(value) : "r"(value) ); |