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* admin/merge-gnulib (GNULIB_MODULES): Add count-leading-zeros. * etc/NEWS: Document the change. * lib/count-leading-zeros.c, lib/count-leading-zeros.h: * m4/count-leading-zeros.m4: New files, copied from Gnulib. * lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate. * src/floatfns.c: Include count-leading-zeros.h. (Flogb): Do not convert fixnum to float before taking the log, as the rounding error can cause the answer to be off by 1. * src/lisp.h (EMACS_UINT_WIDTH): New constant. * test/src/floatfns-tests.el (logb-extreme-fixnum): New test.
13 lines
493 B
Plaintext
13 lines
493 B
Plaintext
# count-leading-zeros.m4 serial 2
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dnl Copyright (C) 2012-2017 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_COUNT_LEADING_ZEROS],
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[
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dnl We don't need (and can't compile) count_leading_zeros_ll
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dnl unless the type 'unsigned long long int' exists.
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AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
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])
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