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641876a20a
configurator failed under clang: checking for #pragma omp and -fopenmp support... ccan/tools/configurator/configurator: Test for HAVE_OPENMP failed with 32512: ./configurator.out: error while loading shared libraries: libomp.so: cannot open shared object file: No such file or directory Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
/* Licensed under LGPLv2.1+ - see LICENSE file for details */
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#include "config.h"
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#include <ccan/bitmap/bitmap.h>
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#include <assert.h>
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#define BIT_ALIGN_DOWN(n) ((n) & ~(BITMAP_WORD_BITS - 1))
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#define BIT_ALIGN_UP(n) BIT_ALIGN_DOWN((n) + BITMAP_WORD_BITS - 1)
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void bitmap_zero_range(bitmap *bitmap, unsigned long n, unsigned long m)
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{
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unsigned long an = BIT_ALIGN_UP(n);
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unsigned long am = BIT_ALIGN_DOWN(m);
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bitmap_word headmask = BITMAP_WORD_1 >> (n % BITMAP_WORD_BITS);
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bitmap_word tailmask = ~(BITMAP_WORD_1 >> (m % BITMAP_WORD_BITS));
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assert(m >= n);
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if (am < an) {
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BITMAP_WORD(bitmap, n) &= ~bitmap_bswap(headmask & tailmask);
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return;
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}
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if (an > n)
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BITMAP_WORD(bitmap, n) &= ~bitmap_bswap(headmask);
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if (am > an)
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memset(&BITMAP_WORD(bitmap, an), 0,
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(am - an) / BITMAP_WORD_BITS * sizeof(bitmap_word));
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if (m > am)
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BITMAP_WORD(bitmap, m) &= ~bitmap_bswap(tailmask);
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}
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void bitmap_fill_range(bitmap *bitmap, unsigned long n, unsigned long m)
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{
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unsigned long an = BIT_ALIGN_UP(n);
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unsigned long am = BIT_ALIGN_DOWN(m);
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bitmap_word headmask = BITMAP_WORD_1 >> (n % BITMAP_WORD_BITS);
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bitmap_word tailmask = ~(BITMAP_WORD_1 >> (m % BITMAP_WORD_BITS));
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assert(m >= n);
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if (am < an) {
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BITMAP_WORD(bitmap, n) |= bitmap_bswap(headmask & tailmask);
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return;
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}
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if (an > n)
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BITMAP_WORD(bitmap, n) |= bitmap_bswap(headmask);
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if (am > an)
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memset(&BITMAP_WORD(bitmap, an), 0xff,
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(am - an) / BITMAP_WORD_BITS * sizeof(bitmap_word));
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if (m > am)
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BITMAP_WORD(bitmap, m) |= bitmap_bswap(tailmask);
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}
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static int bitmap_clz(bitmap_word w)
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{
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#if HAVE_BUILTIN_CLZL
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return __builtin_clzl(w);
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#else
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int lz = 0;
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bitmap_word mask = (bitmap_word)1 << (BITMAP_WORD_BITS - 1);
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while (!(w & mask)) {
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lz++;
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mask >>= 1;
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}
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return lz;
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#endif
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}
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unsigned long bitmap_ffs(const bitmap *bitmap,
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unsigned long n, unsigned long m)
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{
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unsigned long an = BIT_ALIGN_UP(n);
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unsigned long am = BIT_ALIGN_DOWN(m);
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bitmap_word headmask = BITMAP_WORD_1 >> (n % BITMAP_WORD_BITS);
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bitmap_word tailmask = ~(BITMAP_WORD_1 >> (m % BITMAP_WORD_BITS));
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assert(m >= n);
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if (am < an) {
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bitmap_word w = bitmap_bswap(BITMAP_WORD(bitmap, n));
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w &= (headmask & tailmask);
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return w ? am + bitmap_clz(w) : m;
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}
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if (an > n) {
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bitmap_word w = bitmap_bswap(BITMAP_WORD(bitmap, n));
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w &= headmask;
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if (w)
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return BIT_ALIGN_DOWN(n) + bitmap_clz(w);
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}
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while (an < am) {
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bitmap_word w = bitmap_bswap(BITMAP_WORD(bitmap, an));
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if (w)
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return an + bitmap_clz(w);
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an += BITMAP_WORD_BITS;
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}
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if (m > am) {
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bitmap_word w = bitmap_bswap(BITMAP_WORD(bitmap, m));
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w &= tailmask;
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if (w)
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return am + bitmap_clz(w);
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}
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return m;
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}
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