[Bug c/31161] New: __builtin_cexpi is broken on Darwin

[dominiq at lps dot ens dot fr]

When compiled with gcc version 4.3.0 20070309, the following code

#include <math.h>
#include <stdio.h>

int main()
{
  __complex__ double x;

  __real__ x = -1.0;
  __imag__ x = 0.0;

  __complex__ double t = __builtin_clog(x);

  double tmp = 0.5 * (__imag__ t);

  x = __builtin_cexpi(tmp);
  printf("%g %g\n", (__real__ x), (__imag__ x));

  printf("%g %g\n", cos(tmp), sin(tmp));
}

gives an ICE:

failure_v2.c: In function 'main':
failure_v2.c:15: internal compiler error: in expand_builtin_cexpi, at
builtins.c:2380
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

It compiles with g++ and without optimization gives:

[karma] bug/cexp_pb% g++-4 failure_v2.c
[karma] bug/cexp_pb% a.out 
-1 1.22465e-16
6.12323e-17 1

where the last line is the expected result. With -O1 the result is:

[karma] bug/cexp_pb% g++-4 -O1 failure_v2.c
[karma] bug/cexp_pb% a.out
-1 1.22465e-16
-1 1.22465e-16

this is PR30980!-(


-- 
           Summary: __builtin_cexpi is broken on Darwin
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dominiq at lps dot ens dot fr
GCC target triplet: powerpc-apple-darwin7


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31161