Blame jemalloc/include/jemalloc/internal/quantum.h
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#ifndef JEMALLOC_INTERNAL_QUANTUM_H
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#define JEMALLOC_INTERNAL_QUANTUM_H
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/*
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* Minimum allocation alignment is 2^LG_QUANTUM bytes (ignoring tiny size
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* classes).
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*/
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#ifndef LG_QUANTUM
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# if (defined(__i386__) || defined(_M_IX86))
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# define LG_QUANTUM 4
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# endif
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# ifdef __ia64__
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# define LG_QUANTUM 4
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# endif
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# ifdef __alpha__
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# define LG_QUANTUM 4
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# endif
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# if (defined(__sparc64__) || defined(__sparcv9) || defined(__sparc_v9__))
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# define LG_QUANTUM 4
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# endif
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# if (defined(__amd64__) || defined(__x86_64__) || defined(_M_X64))
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# define LG_QUANTUM 4
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# endif
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# ifdef __arm__
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# define LG_QUANTUM 3
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# endif
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# ifdef __aarch64__
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# define LG_QUANTUM 4
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# endif
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# ifdef __hppa__
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# define LG_QUANTUM 4
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# endif
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# ifdef __m68k__
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# define LG_QUANTUM 3
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# endif
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# ifdef __mips__
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# define LG_QUANTUM 3
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# endif
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# ifdef __nios2__
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# define LG_QUANTUM 3
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# endif
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# ifdef __or1k__
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# define LG_QUANTUM 3
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# endif
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# ifdef __powerpc__
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# define LG_QUANTUM 4
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# endif
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# if defined(__riscv) || defined(__riscv__)
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# define LG_QUANTUM 4
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# endif
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# ifdef __s390__
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# define LG_QUANTUM 4
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# endif
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# if (defined (__SH3E__) || defined(__SH4_SINGLE__) || defined(__SH4__) || \
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defined(__SH4_SINGLE_ONLY__))
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# define LG_QUANTUM 4
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# endif
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# ifdef __tile__
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# define LG_QUANTUM 4
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# endif
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# ifdef __le32__
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# define LG_QUANTUM 4
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# endif
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# ifndef LG_QUANTUM
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# error "Unknown minimum alignment for architecture; specify via "
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"--with-lg-quantum"
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# endif
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#endif
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#define QUANTUM ((size_t)(1U << LG_QUANTUM))
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#define QUANTUM_MASK (QUANTUM - 1)
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/* Return the smallest quantum multiple that is >= a. */
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#define QUANTUM_CEILING(a) \
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(((a) + QUANTUM_MASK) & ~QUANTUM_MASK)
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#endif /* JEMALLOC_INTERNAL_QUANTUM_H */
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