gcc/testsuite/gcc.dg/builtins-8.c

   1 /* Copyright (C) 2003, 2006  Free Software Foundation.
   2
   3    Verify that built-in math function constant folding of functions
   4    with one constant argument is correctly performed by the compiler.
   5
   6    Written by Roger Sayle, 30th March 2003.  */
   7
   8 /* { dg-do run } */
   9 /* { dg-options "-O2 -ffast-math" } */
  10
  11 extern void abort(void);
  12 extern double pow(double, double);
  13 extern double sqrt(double);
  14 extern double cbrt(double);
  15
  16 void test(double x)
  17 {
  18   if (pow(x,-1.0) != 1.0/x)
  19     abort ();
  20
  21   if (pow(x,2.0) != x*x)
  22     abort ();
  23
  24   if (pow(x,-2.0) != 1.0/(x*x))
  25     abort ();
  26
  27   if (pow(x,0.5) != sqrt(x))
  28     abort ();
  29
  30 #ifdef HAVE_C99_RUNTIME
  31   if (pow(x,1.0/3.0) != cbrt(x))
  32     abort ();
  33 #endif
  34 }
  35
  36 int main()
  37 {
  38   test (1.0);
  39   test (2.0);
  40   return 0;
  41 }
  42