gcc/testsuite/gcc.target/i386/fma3-fma.c

   1 /* Test that the compiler properly optimizes floating point multiply
   2    and add instructions FMA3 systems.  */
   3
   4 /* { dg-do compile { target { ! ia32 } } } */
   5 /* { dg-options "-O2 -mfma -mno-fma4" } */
   6
   7 extern void exit (int);
   8
   9 float
  10 flt_mul_add (float a, float b, float c)
  11 {
  12   return (a * b) + c;
  13 }
  14
  15 double
  16 dbl_mul_add (double a, double b, double c)
  17 {
  18   return (a * b) + c;
  19 }
  20
  21 float
  22 flt_mul_sub (float a, float b, float c)
  23 {
  24   return (a * b) - c;
  25 }
  26
  27 double
  28 dbl_mul_sub (double a, double b, double c)
  29 {
  30   return (a * b) - c;
  31 }
  32
  33 float
  34 flt_neg_mul_add (float a, float b, float c)
  35 {
  36   return (-(a * b)) + c;
  37 }
  38
  39 double
  40 dbl_neg_mul_add (double a, double b, double c)
  41 {
  42   return (-(a * b)) + c;
  43 }
  44
  45 float
  46 flt_neg_mul_sub (float a, float b, float c)
  47 {
  48   return (-(a * b)) - c;
  49 }
  50
  51 double
  52 dbl_neg_mul_sub (double a, double b, double c)
  53 {
  54   return (-(a * b)) - c;
  55 }
  56
  57 float  f[10] = { 2, 3, 4 };
  58 double d[10] = { 2, 3, 4 };
  59
  60 int main ()
  61 {
  62   f[3] = flt_mul_add (f[0], f[1], f[2]);
  63   f[4] = flt_mul_sub (f[0], f[1], f[2]);
  64   f[5] = flt_neg_mul_add (f[0], f[1], f[2]);
  65   f[6] = flt_neg_mul_sub (f[0], f[1], f[2]);
  66
  67   d[3] = dbl_mul_add (d[0], d[1], d[2]);
  68   d[4] = dbl_mul_sub (d[0], d[1], d[2]);
  69   d[5] = dbl_neg_mul_add (d[0], d[1], d[2]);
  70   d[6] = dbl_neg_mul_sub (d[0], d[1], d[2]);
  71   exit (0);
  72 }
  73
  74 /* { dg-final { scan-assembler "vfmadd...ss" } } */
  75 /* { dg-final { scan-assembler "vfmadd...sd" } } */
  76 /* { dg-final { scan-assembler "vfmsub...ss" } } */
  77 /* { dg-final { scan-assembler "vfmsub...sd" } } */
  78 /* { dg-final { scan-assembler "vfnmadd...ss" } } */
  79 /* { dg-final { scan-assembler "vfnmadd...sd" } } */
  80 /* { dg-final { scan-assembler "vfnmsub...ss" } } */
  81 /* { dg-final { scan-assembler "vfnmsub...sd" } } */