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Remove fls(), use pg_leftmost_one_pos32() instead.

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Commit 4f658dc8 provided the traditional BSD fls() function in
src/port/fls.c so it could be used in several places.  Later we added a
bunch of similar facilities in pg_bitutils.h, based on compiler
builtins that map to hardware instructions.  It's a bit confusing to
have both 1-based and 0-based variants of this operation in use in
different parts of the tree, and neither is blessed by a standard.
Let's drop fls.c and the configure probe, and reuse the newer code.

Reviewed-by: David Rowley <dgrowleyml@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CA%2BhUKG%2B7dSX1XF8yFGmYk-%3D48dbjH2kmzZj16XvhbrWP-9BzRg%40mail.gmail.com
This commit is contained in:
Thomas Munro
2022-07-22 09:41:12 +12:00
parent 3225399021
commit 4f1f5a7f85
11 changed files with 19 additions and 92 deletions
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13
configure vendored
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@ -16771,19 +16771,6 @@ esac
fi
ac_fn_c_check_func "$LINENO" "fls" "ac_cv_func_fls"
if test "x$ac_cv_func_fls" = xyes; then :
$as_echo "#define HAVE_FLS 1" >>confdefs.h
else
case " $LIBOBJS " in
*" fls.$ac_objext "* ) ;;
*) LIBOBJS="$LIBOBJS fls.$ac_objext"
;;
esac
fi
ac_fn_c_check_func "$LINENO" "getopt" "ac_cv_func_getopt"
if test "x$ac_cv_func_getopt" = xyes; then :
$as_echo "#define HAVE_GETOPT 1" >>confdefs.h