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Try to use __builtin_ffsl if ffsl is unavailable.

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Some platforms (like those using Newlib) don't have ffs/ffsl.  This
commit adds a check to configure.ac for __builtin_ffsl if ffsl isn't
found.  __builtin_ffsl performs the same function as ffsl, and has the
added benefit of being available on any platform utilizing
Gcc-compatible compiler.

This change does not address the used of ffs in the MALLOCX_ARENA()
macro.
This commit is contained in:
Richard Diamond
2014-05-28 21:37:02 -05:00
committed by Jason Evans
parent 0b5c92213f
commit 9c3a10fdf6
9 changed files with 71 additions and 17 deletions
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4
include/jemalloc/internal/bitmap.h
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@@ -130,11 +130,11 @@ bitmap_sfu(bitmap_t *bitmap, const bitmap_info_t *binfo)
i = binfo->nlevels - 1;
g = bitmap[binfo->levels[i].group_offset];
bit = ffsl(g) - 1;
bit = jemalloc_ffsl(g) - 1;
while (i > 0) {
i--;
g = bitmap[binfo->levels[i].group_offset + bit];
bit = (bit << LG_BITMAP_GROUP_NBITS) + (ffsl(g) - 1);
bit = (bit << LG_BITMAP_GROUP_NBITS) + (jemalloc_ffsl(g) - 1);
}
bitmap_set(bitmap, binfo, bit);