gcc/testsuite/gcc.target/i386/fma4-fma.c

   1 /* Test that the compiler properly optimizes floating point multiply
   2    and add instructions into vfmaddss, vfmsubss, vfnmaddss,
   3    vfnmsubss on FMA4 systems.  */
   4
   5 /* { dg-do compile { target { ! ia32 } } } */
   6 /* { dg-options "-O2 -mfma4 -mno-fma" } */
   7
   8 extern void exit (int);
   9
  10 float
  11 flt_mul_add (float a, float b, float c)
  12 {
  13   return (a * b) + c;
  14 }
  15
  16 double
  17 dbl_mul_add (double a, double b, double c)
  18 {
  19   return (a * b) + c;
  20 }
  21
  22 float
  23 flt_mul_sub (float a, float b, float c)
  24 {
  25   return (a * b) - c;
  26 }
  27
  28 double
  29 dbl_mul_sub (double a, double b, double c)
  30 {
  31   return (a * b) - c;
  32 }
  33
  34 float
  35 flt_neg_mul_add (float a, float b, float c)
  36 {
  37   return (-(a * b)) + c;
  38 }
  39
  40 double
  41 dbl_neg_mul_add (double a, double b, double c)
  42 {
  43   return (-(a * b)) + c;
  44 }
  45
  46 float
  47 flt_neg_mul_sub (float a, float b, float c)
  48 {
  49   return (-(a * b)) - c;
  50 }
  51
  52 double
  53 dbl_neg_mul_sub (double a, double b, double c)
  54 {
  55   return (-(a * b)) - c;
  56 }
  57
  58 float  f[10] = { 2, 3, 4 };
  59 double d[10] = { 2, 3, 4 };
  60
  61 int main ()
  62 {
  63   f[3] = flt_mul_add (f[0], f[1], f[2]);
  64   f[4] = flt_mul_sub (f[0], f[1], f[2]);
  65   f[5] = flt_neg_mul_add (f[0], f[1], f[2]);
  66   f[6] = flt_neg_mul_sub (f[0], f[1], f[2]);
  67
  68   d[3] = dbl_mul_add (d[0], d[1], d[2]);
  69   d[4] = dbl_mul_sub (d[0], d[1], d[2]);
  70   d[5] = dbl_neg_mul_add (d[0], d[1], d[2]);
  71   d[6] = dbl_neg_mul_sub (d[0], d[1], d[2]);
  72   exit (0);
  73 }
  74
  75 /* { dg-final { scan-assembler "vfmaddss" } } */
  76 /* { dg-final { scan-assembler "vfmaddsd" } } */
  77 /* { dg-final { scan-assembler "vfmsubss" } } */
  78 /* { dg-final { scan-assembler "vfmsubsd" } } */
  79 /* { dg-final { scan-assembler "vfnmaddss" } } */
  80 /* { dg-final { scan-assembler "vfnmaddsd" } } */
  81 /* { dg-final { scan-assembler "vfnmsubss" } } */
  82 /* { dg-final { scan-assembler "vfnmsubsd" } } */