Mercurial > hg > octave-kai > gnulib-hg
annotate m4/exponentf.m4 @ 15857:6b8400199763
New module 'sqrtf'.
* lib/math.in.h (sqrtf): New declaration.
* lib/sqrtf.c: New file.
* m4/sqrtf.m4: New file.
* m4/math_h.m4 (gl_MATH_H): Test whether sqrtf is declared.
(gl_MATH_H_DEFAULTS): Initialize GNULIB_SQRTF, HAVE_SQRTF.
* modules/math (Makefile.am): Substitute GNULIB_SQRTF, HAVE_SQRTF.
* modules/sqrtf: New file.
* tests/test-math-c++.cc: Check the declaration of sqrtf.
* doc/posix-functions/sqrtf.texi: Mention the new module.
author | Bruno Haible <bruno@clisp.org> |
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date | Sat, 08 Oct 2011 21:16:48 +0200 |
parents | 97fc9a21a8fb |
children | 8250f2777afc |
rev | line source |
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1 # exponentf.m4 serial 2 |
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2 dnl Copyright (C) 2007-2008, 2010-2011 Free Software Foundation, Inc. |
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3 dnl This file is free software; the Free Software Foundation |
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4 dnl gives unlimited permission to copy and/or distribute it, |
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5 dnl with or without modifications, as long as this notice is preserved. |
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6 AC_DEFUN([gl_FLOAT_EXPONENT_LOCATION], |
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7 [ |
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8 AC_CACHE_CHECK([where to find the exponent in a 'float'], |
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9 [gl_cv_cc_float_expbit0], |
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10 [ |
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11 AC_RUN_IFELSE( |
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12 [AC_LANG_SOURCE([[ |
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13 #include <float.h> |
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14 #include <stddef.h> |
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15 #include <stdio.h> |
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16 #include <string.h> |
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17 #define NWORDS \ |
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18 ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int)) |
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19 typedef union { float value; unsigned int word[NWORDS]; } memory_float; |
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20 static unsigned int ored_words[NWORDS]; |
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21 static unsigned int anded_words[NWORDS]; |
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22 static void add_to_ored_words (float x) |
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23 { |
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24 memory_float m; |
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25 size_t i; |
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26 /* Clear it first, in case |
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27 sizeof (float) < sizeof (memory_float). */ |
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28 memset (&m, 0, sizeof (memory_float)); |
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29 m.value = x; |
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30 for (i = 0; i < NWORDS; i++) |
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31 { |
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32 ored_words[i] |= m.word[i]; |
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33 anded_words[i] &= m.word[i]; |
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34 } |
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35 } |
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36 int main () |
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37 { |
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38 size_t j; |
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39 FILE *fp = fopen ("conftest.out", "w"); |
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40 if (fp == NULL) |
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41 return 1; |
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42 for (j = 0; j < NWORDS; j++) |
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43 anded_words[j] = ~ (unsigned int) 0; |
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44 add_to_ored_words (0.25f); |
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45 add_to_ored_words (0.5f); |
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46 add_to_ored_words (1.0f); |
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47 add_to_ored_words (2.0f); |
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48 add_to_ored_words (4.0f); |
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49 /* Remove bits that are common (e.g. if representation of the first mantissa |
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50 bit is explicit). */ |
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51 for (j = 0; j < NWORDS; j++) |
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52 ored_words[j] &= ~anded_words[j]; |
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53 /* Now find the nonzero word. */ |
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54 for (j = 0; j < NWORDS; j++) |
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55 if (ored_words[j] != 0) |
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56 break; |
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57 if (j < NWORDS) |
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58 { |
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59 size_t i; |
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60 for (i = j + 1; i < NWORDS; i++) |
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61 if (ored_words[i] != 0) |
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62 { |
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63 fprintf (fp, "unknown"); |
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64 return (fclose (fp) != 0); |
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65 } |
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66 for (i = 0; ; i++) |
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67 if ((ored_words[j] >> i) & 1) |
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68 { |
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69 fprintf (fp, "word %d bit %d", (int) j, (int) i); |
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70 return (fclose (fp) != 0); |
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71 } |
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72 } |
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73 fprintf (fp, "unknown"); |
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74 return (fclose (fp) != 0); |
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75 } |
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76 ]])], |
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77 [gl_cv_cc_float_expbit0=`cat conftest.out`], |
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78 [gl_cv_cc_float_expbit0="unknown"], |
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79 [gl_cv_cc_float_expbit0="word 0 bit 23"]) |
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80 rm -f conftest.out |
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81 ]) |
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82 case "$gl_cv_cc_float_expbit0" in |
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83 word*bit*) |
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84 word=`echo "$gl_cv_cc_float_expbit0" | sed -e 's/word //' -e 's/ bit.*//'` |
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85 bit=`echo "$gl_cv_cc_float_expbit0" | sed -e 's/word.*bit //'` |
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86 AC_DEFINE_UNQUOTED([FLT_EXPBIT0_WORD], [$word], |
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87 [Define as the word index where to find the exponent of 'float'.]) |
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88 AC_DEFINE_UNQUOTED([FLT_EXPBIT0_BIT], [$bit], |
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89 [Define as the bit index in the word where to find bit 0 of the exponent of 'float'.]) |
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90 ;; |
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91 esac |
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92 ]) |