diff options
author | 2021-06-12 03:00:21 +1000 | |
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committer | 2021-06-13 09:38:01 +1000 | |
commit | 73d97b7dc492871d3dcf4ee919fc443dd2308dec (patch) | |
tree | c394cccb9d6514a5b8e69f054d5d27ecc50a5d58 /src/osd/eigccarm.h | |
parent | 27b93b23486533747d9ba185ff54da860223a463 (diff) |
Added helpers for 64-bit count leading zeroes/ones.
Diffstat (limited to 'src/osd/eigccarm.h')
-rw-r--r-- | src/osd/eigccarm.h | 62 |
1 files changed, 54 insertions, 8 deletions
diff --git a/src/osd/eigccarm.h b/src/osd/eigccarm.h index 27d79c4a5c6..90004daf9d4 100644 --- a/src/osd/eigccarm.h +++ b/src/osd/eigccarm.h @@ -239,14 +239,14 @@ _mulu_64x64(uint64_t a, uint64_t b, uint64_t &hi) ***************************************************************************/ /*------------------------------------------------- - count_leading_zeros - return the number of + count_leading_zeros_32 - return the number of leading zero bits in a 32-bit value -------------------------------------------------*/ #if defined(__aarch64__) -#define count_leading_zeros _count_leading_zeros +#define count_leading_zeros_32 _count_leading_zeros_32 inline uint8_t ATTR_CONST ATTR_FORCE_INLINE -_count_leading_zeros(uint32_t value) +_count_leading_zeros_32(uint32_t value) { uint32_t result; @@ -256,20 +256,20 @@ _count_leading_zeros(uint32_t value) : [value] "r" (value) ); - return result; + return uint8_t(result); } #endif /*------------------------------------------------- - count_leading_ones - return the number of + count_leading_ones_32 - return the number of leading one bits in a 32-bit value -------------------------------------------------*/ #if defined(__aarch64__) -#define count_leading_ones _count_leading_ones +#define count_leading_ones_32 _count_leading_ones_32 inline uint8_t ATTR_CONST ATTR_FORCE_INLINE -_count_leading_ones(uint32_t value) +_count_leading_ones_32(uint32_t value) { uint32_t result; @@ -279,7 +279,53 @@ _count_leading_ones(uint32_t value) : [value] "r" (~value) ); - return result; + return uint8_t(result); +} +#endif + + +/*------------------------------------------------- + count_leading_zeros_64 - return the number of + leading zero bits in a 64-bit value +-------------------------------------------------*/ + +#if defined(__aarch64__) +#define count_leading_zeros_64 _count_leading_zeros_64 +inline uint8_t ATTR_CONST ATTR_FORCE_INLINE +_count_leading_zeros_64(uint64_t value) +{ + uint64_t result; + + __asm__ ( + " clz %[result], %[value] \n" + : [result] "=r" (result) + : [value] "r" (value) + ); + + return uint8_t(result); +} +#endif + + +/*------------------------------------------------- + count_leading_ones_64 - return the number of + leading one bits in a 64-bit value +-------------------------------------------------*/ + +#if defined(__aarch64__) +#define count_leading_ones_64 _count_leading_ones_64 +inline uint8_t ATTR_CONST ATTR_FORCE_INLINE +_count_leading_ones_64(uint64_t value) +{ + uint64_t result; + + __asm__ ( + " clz %[result], %[value] \n" + : [result] "=r" (result) + : [value] "r" (~value) + ); + + return uint8_t(result); } #endif |