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cpu/arm7_common: add __ARM_FEATURE_CLZ feature test

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The feature test macro should work on all ARM CPUs supported by gcc.
This commit is contained in:
Benjamin Valentin 2020-07-19 22:44:06 +02:00
parent 74bbb87f78
commit 464dc63f08
1 changed files with 11 additions and 0 deletions
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11
cpu/arm7_common/include/arm_cpu.h
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@ -34,6 +34,17 @@ void arm_reset(void);
*/
#define STACK_CANARY_WORD (0xEAFFFFFEu)
/**
* @brief Select fastest bitarithm_lsb implementation
* @{
*/
#ifdef __ARM_FEATURE_CLZ
#define BITARITHM_LSB_BUILTIN
#define BITARITHM_HAS_CLZ
#else
#define BITARITHM_LSB_LOOKUP
#endif
/** @} */
#ifdef __cplusplus
}