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inline BARREL_SHIFT code

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Thomas Waldmann 2025-05-26 21:52:41 +02:00
parent 522eaf6899
commit 8d3767efe7
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1 changed files with 6 additions and 3 deletions
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9
src/borg/chunker.pyx
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@ -330,9 +330,12 @@ table_base = [
0xc5ae37bb, 0xa76ce12a, 0x8150d8f3, 0x2ec29218, 0xa35f0984, 0x48c0647e, 0x0b5ff98c, 0x71893f7b
]
# Barrel shift macro from C
cdef inline uint32_t BARREL_SHIFT(uint32_t v, uint32_t shift):
return ((v << shift) | (v >> ((32 - shift) & 0x1f)))
# This seems to be the most reliable way to inline this code, using a C preprocessor macro:
cdef extern from *:
"""
#define BARREL_SHIFT(v, shift) (((v) << (shift)) | ((v) >> (((32 - (shift)) & 0x1f))))
"""
uint32_t BARREL_SHIFT(uint32_t v, uint32_t shift)
cdef uint32_t* buzhash_init_table(uint32_t seed):