builtins-6.c

来自「linux下编程用 编译软件」· C语言 代码 · 共 81 行

/* Copyright (C) 2003  Free Software Foundation.

   Verify that constant folding comparisons against built-in math functions
   don't cause any problems for the compiler, and produce expected results.

   Written by Roger Sayle, 15th March 2003.  */

/* { dg-do run } */
/* { dg-options "-O2 -ffast-math" } */

#include <float.h>

extern void abort (void);
extern double sqrt (double);

int test1(double x)
{
  return sqrt(x) < -9.0;
}

int test2(double x)
{
  return sqrt(x) > -9.0;
}

int test3(double x)
{
  return sqrt(x) < 9.0;
}

int test4(double x)
{
  return sqrt(x) > 9.0;
}

int test5(double x)
{
  return sqrt(x) < DBL_MAX;
}

int test6(double x)
{
  return sqrt(x) > DBL_MAX;
}

int main()
{
  double x;

  x = 80.0;
  if (test1 (x))
    abort ();
  if (! test2 (x))
    abort ();
  if (! test3 (x))
    abort ();
  if (test4 (x))
    abort ();
  if (! test5 (x))
    abort ();
  if (test6 (x))
    abort ();

  x = 100.0;
  if (test1 (x))
    abort ();
  if (! test2 (x))
    abort ();
  if (test3 (x))
    abort ();
  if (! test4 (x))
    abort ();
  if (! test5 (x))
    abort ();
  if (test6 (x))
    abort ();

  return 0;
}