diff options
| author | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2009-06-14 11:57:18 +0000 |
|---|---|---|
| committer | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2009-06-14 11:57:18 +0000 |
| commit | 827c4531844b4640583d8cf87b67f75e1e66afde (patch) | |
| tree | 42028490a3ad99c5c3eafbf5f2bc9e0408038b36 /acinclude.m4 | |
| parent | 3de621ecfd84020a2dba5e7317df6040a027d147 (diff) | |
| download | mpfr-827c4531844b4640583d8cf87b67f75e1e66afde.tar.gz | |
acinclude.m4: Make sure results of calculations on constants used with
the fesetround() test are not precomputed by GCC (occurs on MIPS).
Patch from Maciej W. Rozycki.
https://sympa.inria.fr/sympa/arc/mpfr/2009-06/msg00036.html
http://article.gmane.org/gmane.comp.lib.mpfr.general/174
git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@6274 280ebfd0-de03-0410-8827-d642c229c3f4
Diffstat (limited to 'acinclude.m4')
| -rw-r--r-- | acinclude.m4 | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/acinclude.m4 b/acinclude.m4 index 79d46f065..719b6ccba 100644 --- a/acinclude.m4 +++ b/acinclude.m4 @@ -150,6 +150,7 @@ if test -n "$GCC"; then static double get_max (void); int main() { double x = 0.5; + double y; int i; for (i = 1; i <= 11; i++) x *= x; @@ -158,14 +159,14 @@ int main() { #ifdef MPFR_HAVE_FESETROUND /* Useful test for the G4 PowerPC */ fesetround(FE_TOWARDZERO); - x = get_max (); + x = y = get_max (); x *= 2.0; - if (x != get_max ()) + if (x != y) return 1; #endif return 0; } -static double get_max (void) { return DBL_MAX; } +static double get_max (void) { static volatile double d = DBL_MAX; return d; } ], [mpfr_cv_gcc_floatconv_bug="no"], [mpfr_cv_gcc_floatconv_bug="yes, use -ffloat-store"], [mpfr_cv_gcc_floatconv_bug="cannot test, use -ffloat-store"]) |