------- Comment #3 from sje at cup dot hp dot com 2010-06-25 20:21 -------
I see this failure on ia64 linux and hp-ux. The interesting thing is that it
fails when compiled with C++ but not when compiled with C. Here is a smaller
test case that shows that the imaginary part of c1 is +0 in the good case
(compiled with C) and -0 in the bad case (compiled with C++). This only shows
up when not doing any optimization (-O0) because with optimization everything
seems to get correctly folded.
#ifdef __cplusplus
extern "C" {
#endif
extern void exit(int);
int printf(const char *format, ...);
#ifdef __cplusplus
}
#endif
int main (void) {
_Complex float a1, b1, c1;
a1 = 0.0f + 0.0if;
b1 = 0.0f - 0.0if;
c1 = a1 + b1;
if (__builtin_copysignf (1.0, __imag__ (a1)) != + 1.0) printf("one\n");
if (__builtin_copysignf (1.0, __imag__ (b1)) != - 1.0) printf("two\n");
if (__builtin_copysignf (1.0, __imag__ (c1)) != + 1.0) printf("three\n");
printf("%f\n",__imag__ (c1));
exit (0);
}
--
sje at cup dot hp dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sje at cup dot hp dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44583
