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From: "amker.cheng at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/51867] GCC generates inconsistent code for same sources calling builtin calls, like sqrtf
Date: Tue, 17 Jan 2012 10:43:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51867

--- Comment #3 from amker.cheng <amker.cheng at gmail dot com> 2012-01-17 10:35:14 UTC ---
test case c-c++-common/dfp/signbit-2.c depends on this check.
the case is like:
---------------------------------------------------------------------
/* { dg-options "-O0" } */

/* Check that the compiler uses builtins for signbit; if not the link
   will fail because library functions are in libm.  */

#include "dfp-dbg.h"

volatile _Decimal32 sd = 2.3df;
volatile _Decimal64 dd = -4.5dd;
volatile _Decimal128 tf = 5.3dl;
volatile float f = 1.2f;
volatile double d = -7.8;
volatile long double ld = 3.4L;

EXTERN int signbitf (float);
EXTERN int signbit (double);
EXTERN int signbitl (long double);
EXTERN int signbitd32 (_Decimal32);
EXTERN int signbitd64 (_Decimal64);
EXTERN int signbitd128 (_Decimal128);

int
main ()
{
  if (signbitf (f) != 0) FAILURE
  if (signbit (d) == 0) FAILURE
  if (signbitl (ld) != 0) FAILURE
  if (signbitd32 (sd) != 0) FAILURE
  if (signbitd64 (dd) == 0) FAILURE
  if (signbitd128 (tf) != 0) FAILURE

  FINISH
}

It is compiled without optimization and will fail if no builtin_* functions are
used.
Not sure it is intended or not.