/*
alphaev68-dec-osf5.1b long double optimization bug with gcc-4.0.0
regression from gcc-3.4.3
% config.guess
alphaev68-dec-osf5.1b
% gcc -v
Using built-in specs.
Target: alphaev68-dec-osf5.1b
Configured with: /usr/local/gcc-4.0.0/src/gcc-4.0.0/configure
--enable-languages=c --prefix=/usr/local/gcc-4.0.0/alpha-OSF1-V5
Thread model: posix
gcc version 4.0.0
%
% gcc -mieee-with-inexact -o foo foo.c
% foo
1
%
% gcc -mieee-with-inexact -O1 -o foo foo.c
% foo
0
%
only happens with "long double", not with "double"
*/
#include <stdio.h>
#define DBL_NAN ((long double) 0.0/0.0)
static int
Isnan_ld (long double d)
{
int ans;
long double __x = (d);
if ((d) != __x)
ans = 1;
else
ans = 0;
return ans;
}
int
main (int argc, char *argv[])
{
long double d;
d = (long double) DBL_NAN;
printf("%d\n", Isnan_ld(d));
return 0;
}
--
Summary: alphaev68-dec-osf5.1b long double optimization bug with
gcc-4.0.0
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: regression
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: kminola at eng dot umd dot edu
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: alphaev68-dec-osf5.1b
GCC host triplet: alphaev68-dec-osf5.1b
GCC target triplet: alphaev68-dec-osf5.1b
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21390
