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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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3
include/jemalloc/internal/jemalloc_internal.h.in
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@ -215,6 +215,9 @@ static const bool config_ivsalloc =
# ifdef __tile__
# define LG_QUANTUM 4
# endif
# ifdef __le32__
# define LG_QUANTUM 4
# endif
# ifndef LG_QUANTUM
# error "No LG_QUANTUM definition for architecture; specify via CPPFLAGS"
# endif