e9852b5776
This is the first header refactoring diff, #533. It splits the assert and util components into separate, hermetic, header files. In the process, it splits out two of the large sub-components of util (the stdio.h replacement, and bit manipulation routines) into their own components (malloc_io.h and bit_util.h). This is mostly to break up cyclic dependencies, but it also breaks off a good chunk of the catch-all-ness of util, which is nice.
166 lines
3.1 KiB
C
166 lines
3.1 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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#endif /* JEMALLOC_INTERNAL_BIT_UTIL_H */
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