e904f813b4
This class removes almost all the dependencies on size_classes.h, accessing the data there only via the new module sc.h, which does not depend on any configuration options. In a subsequent commit, we'll remove the configure-time size class computations, doing them at boot time, instead.
234 lines
5.7 KiB
C
234 lines
5.7 KiB
C
#ifndef JEMALLOC_INTERNAL_BIT_UTIL_H
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#define JEMALLOC_INTERNAL_BIT_UTIL_H
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#include "jemalloc/internal/assert.h"
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#define BIT_UTIL_INLINE static inline
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/* Sanity check. */
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#if !defined(JEMALLOC_INTERNAL_FFSLL) || !defined(JEMALLOC_INTERNAL_FFSL) \
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|| !defined(JEMALLOC_INTERNAL_FFS)
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# error JEMALLOC_INTERNAL_FFS{,L,LL} should have been defined by configure
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#endif
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BIT_UTIL_INLINE unsigned
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ffs_llu(unsigned long long bitmap) {
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return JEMALLOC_INTERNAL_FFSLL(bitmap);
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}
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BIT_UTIL_INLINE unsigned
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ffs_lu(unsigned long bitmap) {
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return JEMALLOC_INTERNAL_FFSL(bitmap);
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}
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BIT_UTIL_INLINE unsigned
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ffs_u(unsigned bitmap) {
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return JEMALLOC_INTERNAL_FFS(bitmap);
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}
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BIT_UTIL_INLINE unsigned
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ffs_zu(size_t bitmap) {
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#if LG_SIZEOF_PTR == LG_SIZEOF_INT
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return ffs_u(bitmap);
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#elif LG_SIZEOF_PTR == LG_SIZEOF_LONG
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return ffs_lu(bitmap);
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#elif LG_SIZEOF_PTR == LG_SIZEOF_LONG_LONG
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return ffs_llu(bitmap);
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#else
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#error No implementation for size_t ffs()
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#endif
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}
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BIT_UTIL_INLINE unsigned
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ffs_u64(uint64_t bitmap) {
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#if LG_SIZEOF_LONG == 3
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return ffs_lu(bitmap);
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#elif LG_SIZEOF_LONG_LONG == 3
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return ffs_llu(bitmap);
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#else
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#error No implementation for 64-bit ffs()
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#endif
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}
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BIT_UTIL_INLINE unsigned
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ffs_u32(uint32_t bitmap) {
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#if LG_SIZEOF_INT == 2
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return ffs_u(bitmap);
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#else
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#error No implementation for 32-bit ffs()
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#endif
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return ffs_u(bitmap);
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}
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BIT_UTIL_INLINE uint64_t
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pow2_ceil_u64(uint64_t x) {
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x--;
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x |= x >> 1;
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x |= x >> 2;
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x |= x >> 4;
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x |= x >> 8;
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x |= x >> 16;
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x |= x >> 32;
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x++;
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return x;
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}
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BIT_UTIL_INLINE uint32_t
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pow2_ceil_u32(uint32_t x) {
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x--;
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x |= x >> 1;
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x |= x >> 2;
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x |= x >> 4;
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x |= x >> 8;
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x |= x >> 16;
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x++;
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return x;
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}
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/* Compute the smallest power of 2 that is >= x. */
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BIT_UTIL_INLINE size_t
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pow2_ceil_zu(size_t x) {
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#if (LG_SIZEOF_PTR == 3)
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return pow2_ceil_u64(x);
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#else
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return pow2_ceil_u32(x);
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#endif
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}
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#if (defined(__i386__) || defined(__amd64__) || defined(__x86_64__))
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BIT_UTIL_INLINE unsigned
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lg_floor(size_t x) {
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size_t ret;
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assert(x != 0);
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asm ("bsr %1, %0"
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: "=r"(ret) // Outputs.
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: "r"(x) // Inputs.
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);
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assert(ret < UINT_MAX);
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return (unsigned)ret;
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}
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#elif (defined(_MSC_VER))
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BIT_UTIL_INLINE unsigned
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lg_floor(size_t x) {
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unsigned long ret;
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assert(x != 0);
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#if (LG_SIZEOF_PTR == 3)
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_BitScanReverse64(&ret, x);
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#elif (LG_SIZEOF_PTR == 2)
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_BitScanReverse(&ret, x);
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#else
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# error "Unsupported type size for lg_floor()"
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#endif
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assert(ret < UINT_MAX);
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return (unsigned)ret;
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}
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#elif (defined(JEMALLOC_HAVE_BUILTIN_CLZ))
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BIT_UTIL_INLINE unsigned
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lg_floor(size_t x) {
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assert(x != 0);
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#if (LG_SIZEOF_PTR == LG_SIZEOF_INT)
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return ((8 << LG_SIZEOF_PTR) - 1) - __builtin_clz(x);
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#elif (LG_SIZEOF_PTR == LG_SIZEOF_LONG)
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return ((8 << LG_SIZEOF_PTR) - 1) - __builtin_clzl(x);
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#else
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# error "Unsupported type size for lg_floor()"
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#endif
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}
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#else
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BIT_UTIL_INLINE unsigned
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lg_floor(size_t x) {
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assert(x != 0);
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x |= (x >> 1);
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x |= (x >> 2);
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x |= (x >> 4);
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x |= (x >> 8);
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x |= (x >> 16);
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#if (LG_SIZEOF_PTR == 3)
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x |= (x >> 32);
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#endif
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if (x == SIZE_T_MAX) {
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return (8 << LG_SIZEOF_PTR) - 1;
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}
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x++;
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return ffs_zu(x) - 2;
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}
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#endif
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#undef BIT_UTIL_INLINE
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/* A compile-time version of lg_ceil */
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#define LG_CEIL(x) ( \
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(x) <= (1ULL << 0ULL) ? 0 : \
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(x) <= (1ULL << 1ULL) ? 1 : \
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(x) <= (1ULL << 2ULL) ? 2 : \
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(x) <= (1ULL << 3ULL) ? 3 : \
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(x) <= (1ULL << 4ULL) ? 4 : \
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(x) <= (1ULL << 5ULL) ? 5 : \
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(x) <= (1ULL << 6ULL) ? 6 : \
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(x) <= (1ULL << 7ULL) ? 7 : \
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(x) <= (1ULL << 8ULL) ? 8 : \
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(x) <= (1ULL << 9ULL) ? 9 : \
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(x) <= (1ULL << 10ULL) ? 10 : \
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(x) <= (1ULL << 11ULL) ? 11 : \
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(x) <= (1ULL << 12ULL) ? 12 : \
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(x) <= (1ULL << 13ULL) ? 13 : \
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(x) <= (1ULL << 14ULL) ? 14 : \
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(x) <= (1ULL << 15ULL) ? 15 : \
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(x) <= (1ULL << 16ULL) ? 16 : \
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(x) <= (1ULL << 17ULL) ? 17 : \
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(x) <= (1ULL << 18ULL) ? 18 : \
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(x) <= (1ULL << 19ULL) ? 19 : \
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(x) <= (1ULL << 20ULL) ? 20 : \
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(x) <= (1ULL << 21ULL) ? 21 : \
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(x) <= (1ULL << 22ULL) ? 22 : \
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(x) <= (1ULL << 23ULL) ? 23 : \
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(x) <= (1ULL << 24ULL) ? 24 : \
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(x) <= (1ULL << 25ULL) ? 25 : \
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(x) <= (1ULL << 26ULL) ? 26 : \
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(x) <= (1ULL << 27ULL) ? 27 : \
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(x) <= (1ULL << 28ULL) ? 28 : \
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(x) <= (1ULL << 29ULL) ? 29 : \
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(x) <= (1ULL << 30ULL) ? 30 : \
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(x) <= (1ULL << 31ULL) ? 31 : \
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(x) <= (1ULL << 32ULL) ? 32 : \
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(x) <= (1ULL << 33ULL) ? 33 : \
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(x) <= (1ULL << 34ULL) ? 34 : \
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(x) <= (1ULL << 35ULL) ? 35 : \
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(x) <= (1ULL << 36ULL) ? 36 : \
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(x) <= (1ULL << 37ULL) ? 37 : \
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(x) <= (1ULL << 38ULL) ? 38 : \
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(x) <= (1ULL << 39ULL) ? 39 : \
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(x) <= (1ULL << 40ULL) ? 40 : \
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(x) <= (1ULL << 41ULL) ? 41 : \
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(x) <= (1ULL << 42ULL) ? 42 : \
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(x) <= (1ULL << 43ULL) ? 43 : \
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(x) <= (1ULL << 44ULL) ? 44 : \
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(x) <= (1ULL << 45ULL) ? 45 : \
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(x) <= (1ULL << 46ULL) ? 46 : \
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(x) <= (1ULL << 47ULL) ? 47 : \
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(x) <= (1ULL << 48ULL) ? 48 : \
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(x) <= (1ULL << 49ULL) ? 49 : \
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(x) <= (1ULL << 50ULL) ? 50 : \
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(x) <= (1ULL << 51ULL) ? 51 : \
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(x) <= (1ULL << 52ULL) ? 52 : \
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(x) <= (1ULL << 53ULL) ? 53 : \
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(x) <= (1ULL << 54ULL) ? 54 : \
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(x) <= (1ULL << 55ULL) ? 55 : \
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(x) <= (1ULL << 56ULL) ? 56 : \
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(x) <= (1ULL << 57ULL) ? 57 : \
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(x) <= (1ULL << 58ULL) ? 58 : \
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(x) <= (1ULL << 59ULL) ? 59 : \
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(x) <= (1ULL << 60ULL) ? 60 : \
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(x) <= (1ULL << 61ULL) ? 61 : \
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(x) <= (1ULL << 62ULL) ? 62 : \
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(x) <= (1ULL << 63ULL) ? 63 : \
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64)
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#endif /* JEMALLOC_INTERNAL_BIT_UTIL_H */
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