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 } */
   6 /* { dg-require-effective-target lp64 } */
   7 /* { dg-options "-O2 -mfma4" } */
   8
   9 extern void exit (int);
  10
  11 float
  12 flt_mul_add (float a, float b, float c)
  13 {
  14   return (a * b) + c;
  15 }
  16
  17 double
  18 dbl_mul_add (double a, double b, double c)
  19 {
  20   return (a * b) + c;
  21 }
  22
  23 float
  24 flt_mul_sub (float a, float b, float c)
  25 {
  26   return (a * b) - c;
  27 }
  28
  29 double
  30 dbl_mul_sub (double a, double b, double c)
  31 {
  32   return (a * b) - c;
  33 }
  34
  35 float
  36 flt_neg_mul_add (float a, float b, float c)
  37 {
  38   return (-(a * b)) + c;
  39 }
  40
  41 double
  42 dbl_neg_mul_add (double a, double b, double c)
  43 {
  44   return (-(a * b)) + c;
  45 }
  46
  47 float
  48 flt_neg_mul_sub (float a, float b, float c)
  49 {
  50   return (-(a * b)) - c;
  51 }
  52
  53 double
  54 dbl_neg_mul_sub (double a, double b, double c)
  55 {
  56   return (-(a * b)) - c;
  57 }
  58
  59 float  f[10] = { 2, 3, 4 };
  60 double d[10] = { 2, 3, 4 };
  61
  62 int main ()
  63 {
  64   f[3] = flt_mul_add (f[0], f[1], f[2]);
  65   f[4] = flt_mul_sub (f[0], f[1], f[2]);
  66   f[5] = flt_neg_mul_add (f[0], f[1], f[2]);
  67   f[6] = flt_neg_mul_sub (f[0], f[1], f[2]);
  68
  69   d[3] = dbl_mul_add (d[0], d[1], d[2]);
  70   d[4] = dbl_mul_sub (d[0], d[1], d[2]);
  71   d[5] = dbl_neg_mul_add (d[0], d[1], d[2]);
  72   d[6] = dbl_neg_mul_sub (d[0], d[1], d[2]);
  73   exit (0);
  74 }
  75
  76 /* { dg-final { scan-assembler "vfmaddss" } } */
  77 /* { dg-final { scan-assembler "vfmaddsd" } } */
  78 /* { dg-final { scan-assembler "vfmsubss" } } */
  79 /* { dg-final { scan-assembler "vfmsubsd" } } */
  80 /* { dg-final { scan-assembler "vfnmaddss" } } */
  81 /* { dg-final { scan-assembler "vfnmaddsd" } } */
  82 /* { dg-final { scan-assembler "vfnmsubss" } } */
  83 /* { dg-final { scan-assembler "vfnmsubsd" } } */