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changeset 39912:062361de7628

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floor, ceil, trunc, truncf, truncl: Defeat GCC optimizations. * m4/floor.m4 (gl_FUNC_FLOOR_LIBS): Use 'floor' also through a function pointer. * m4/ceil.m4 (gl_FUNC_CEIL_LIBS): Use 'ceil' also through a function pointer. * m4/trunc.m4 (gl_FUNC_TRUNC): Use 'trunc' also through a function pointer. * m4/truncf.m4 (gl_FUNC_TRUNCF): Use 'truncf' also through a function pointer. * m4/truncl.m4 (gl_FUNC_TRUNCL): Use 'truncl' also through a function pointer.
author Bruno Haible <bruno@clisp.org>
date Sun, 14 Oct 2018 09:27:21 +0200
parents 5f0ef98dc2ce
children 73d60b1f9c96
files ChangeLog m4/ceil.m4 m4/floor.m4 m4/trunc.m4 m4/truncf.m4 m4/truncl.m4
diffstat 6 files changed, 39 insertions(+), 15 deletions(-) [+]
line wrap: on
line diff
--- a/ChangeLog	Sat Oct 13 07:16:00 2018 +0200
+++ b/ChangeLog	Sun Oct 14 09:27:21 2018 +0200
@@ -1,3 +1,17 @@
+2018-10-14  Bruno Haible  <bruno@clisp.org>
+
+	floor, ceil, trunc, truncf, truncl: Defeat GCC optimizations.
+	* m4/floor.m4 (gl_FUNC_FLOOR_LIBS): Use 'floor' also through a function
+	pointer.
+	* m4/ceil.m4 (gl_FUNC_CEIL_LIBS): Use 'ceil' also through a function
+	pointer.
+	* m4/trunc.m4 (gl_FUNC_TRUNC): Use 'trunc' also through a function
+	pointer.
+	* m4/truncf.m4 (gl_FUNC_TRUNCF): Use 'truncf' also through a function
+	pointer.
+	* m4/truncl.m4 (gl_FUNC_TRUNCL): Use 'truncl' also through a function
+	pointer.
+
 2018-10-13  Akim Demaille  <akim@lrde.epita.fr>
 
 	bootstrap: fix wget command for po files.
--- a/m4/ceil.m4	Sat Oct 13 07:16:00 2018 +0200
+++ b/m4/ceil.m4	Sun Oct 14 09:27:21 2018 +0200
@@ -1,4 +1,4 @@
-# ceil.m4 serial 11
+# ceil.m4 serial 12
 dnl Copyright (C) 2007, 2009-2018 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -81,8 +81,9 @@
            # define __NO_MATH_INLINES 1 /* for glibc */
            #endif
            #include <math.h>
+           double (*funcptr) (double) = ceil;
            double x;]],
-         [[x = ceil(x);]])],
+         [[x = funcptr(x) + ceil(x);]])],
       [gl_cv_func_ceil_libm=])
     if test "$gl_cv_func_ceil_libm" = "?"; then
       save_LIBS="$LIBS"
@@ -93,8 +94,9 @@
              # define __NO_MATH_INLINES 1 /* for glibc */
              #endif
              #include <math.h>
+             double (*funcptr) (double) = ceil;
              double x;]],
-           [[x = ceil(x);]])],
+           [[x = funcptr(x) + ceil(x);]])],
         [gl_cv_func_ceil_libm="-lm"])
       LIBS="$save_LIBS"
     fi
--- a/m4/floor.m4	Sat Oct 13 07:16:00 2018 +0200
+++ b/m4/floor.m4	Sun Oct 14 09:27:21 2018 +0200
@@ -1,4 +1,4 @@
-# floor.m4 serial 10
+# floor.m4 serial 11
 dnl Copyright (C) 2007, 2009-2018 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -77,8 +77,9 @@
            # define __NO_MATH_INLINES 1 /* for glibc */
            #endif
            #include <math.h>
+           double (*funcptr) (double) = floor;
            double x;]],
-         [[x = floor(x);]])],
+         [[x = funcptr(x) + floor(x);]])],
       [gl_cv_func_floor_libm=])
     if test "$gl_cv_func_floor_libm" = "?"; then
       save_LIBS="$LIBS"
@@ -89,8 +90,9 @@
              # define __NO_MATH_INLINES 1 /* for glibc */
              #endif
              #include <math.h>
+             double (*funcptr) (double) = floor;
              double x;]],
-           [[x = floor(x);]])],
+           [[x = funcptr(x) + floor(x);]])],
         [gl_cv_func_floor_libm="-lm"])
       LIBS="$save_LIBS"
     fi
--- a/m4/trunc.m4	Sat Oct 13 07:16:00 2018 +0200
+++ b/m4/trunc.m4	Sun Oct 14 09:27:21 2018 +0200
@@ -1,4 +1,4 @@
-# trunc.m4 serial 11
+# trunc.m4 serial 12
 dnl Copyright (C) 2007, 2010-2018 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -21,8 +21,9 @@
            # define __NO_MATH_INLINES 1 /* for glibc */
            #endif
            #include <math.h>
+           double (*funcptr) (double) = trunc;
            double x;]],
-         [[x = trunc(x);]])],
+         [[x = funcptr(x) + trunc(x);]])],
       [TRUNC_LIBM=])
     if test "$TRUNC_LIBM" = "?"; then
       save_LIBS="$LIBS"
@@ -33,8 +34,9 @@
              # define __NO_MATH_INLINES 1 /* for glibc */
              #endif
              #include <math.h>
+             double (*funcptr) (double) = trunc;
              double x;]],
-           [[x = trunc(x);]])],
+           [[x = funcptr(x) + trunc(x);]])],
         [TRUNC_LIBM="-lm"])
       LIBS="$save_LIBS"
     fi
--- a/m4/truncf.m4	Sat Oct 13 07:16:00 2018 +0200
+++ b/m4/truncf.m4	Sun Oct 14 09:27:21 2018 +0200
@@ -1,4 +1,4 @@
-# truncf.m4 serial 11
+# truncf.m4 serial 12
 dnl Copyright (C) 2007, 2010-2018 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -21,8 +21,9 @@
            # define __NO_MATH_INLINES 1 /* for glibc */
            #endif
            #include <math.h>
+           float (*funcptr) (float) = truncf;
            float x;]],
-         [[x = truncf(x);]])],
+         [[x = funcptr(x) + truncf(x);]])],
       [TRUNCF_LIBM=])
     if test "$TRUNCF_LIBM" = "?"; then
       save_LIBS="$LIBS"
@@ -33,8 +34,9 @@
              # define __NO_MATH_INLINES 1 /* for glibc */
              #endif
              #include <math.h>
+             float (*funcptr) (float) = truncf;
              float x;]],
-           [[x = truncf(x);]])],
+           [[x = funcptr(x) + truncf(x);]])],
         [TRUNCF_LIBM="-lm"])
       LIBS="$save_LIBS"
     fi
--- a/m4/truncl.m4	Sat Oct 13 07:16:00 2018 +0200
+++ b/m4/truncl.m4	Sun Oct 14 09:27:21 2018 +0200
@@ -1,4 +1,4 @@
-# truncl.m4 serial 13
+# truncl.m4 serial 14
 dnl Copyright (C) 2007-2008, 2010-2018 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -25,8 +25,9 @@
            # define __NO_MATH_INLINES 1 /* for glibc */
            #endif
            #include <math.h>
+           long double (*funcptr) (long double) = truncl;
            long double x;]],
-         [[x = truncl(x);]])],
+         [[x = funcptr(x) + truncl(x);]])],
       [TRUNCL_LIBM=])
     if test "$TRUNCL_LIBM" = "?"; then
       save_LIBS="$LIBS"
@@ -37,8 +38,9 @@
              # define __NO_MATH_INLINES 1 /* for glibc */
              #endif
              #include <math.h>
+             long double (*funcptr) (long double) = truncl;
              long double x;]],
-           [[x = truncl(x);]])],
+           [[x = funcptr(x) + truncl(x);]])],
         [TRUNCL_LIBM="-lm"])
       LIBS="$save_LIBS"
     fi