gcc/testsuite/gcc.target/i386/fma4-256-nmsubXX.c

   1 /* { dg-require-effective-target fma4 } */
   2 /* { dg-options "-O2 -mfma4" } */
   3
   4 #include "fma4-check.h"
   5
   6 #include <x86intrin.h>
   7 #include <string.h>
   8
   9 #define NUM 20
  10
  11 union
  12 {
  13   __m256 x[NUM];
  14   float f[NUM * 8];
  15   __m256d y[NUM];
  16   double d[NUM * 4];
  17 } dst, res, src1, src2, src3;
  18
  19 /* Note that in macc*,msub*,mnmacc* and mnsub* instructions, the intermdediate
  20    product is not rounded, only the addition is rounded. */
  21
  22 static void
  23 init_nmsubps ()
  24 {
  25   int i;
  26   for (i = 0; i < NUM * 8; i++)
  27     {
  28       src1.f[i] = i;
  29       src2.f[i] = i + 10;
  30       src3.f[i] = i + 20;
  31     }
  32 }
  33
  34 static void
  35 init_nmsubpd ()
  36 {
  37   int i;
  38   for (i = 0; i < NUM * 4; i++)
  39     {
  40       src1.d[i] = i;
  41       src2.d[i] = i + 10;
  42       src3.d[i] = i + 20;
  43     }
  44 }
  45
  46 static int
  47 check_nmsubps ()
  48 {
  49   int i, j, check_fails = 0;
  50   for (i = 0; i < NUM * 8; i = i + 8)
  51     for (j = 0; j < 8; j++)
  52       {
  53         res.f[i + j] = - (src1.f[i + j] * src2.f[i + j]) - src3.f[i + j];
  54         if (dst.f[i + j] != res.f[i + j])
  55           check_fails++;
  56       }
  57   return check_fails++;
  58 }
  59
  60 static int
  61 check_nmsubpd ()
  62 {
  63   int i, j, check_fails = 0;
  64   for (i = 0; i < NUM * 4; i = i + 4)
  65     for (j = 0; j < 4; j++)
  66       {
  67         res.d[i + j] = - (src1.d[i + j] * src2.d[i + j]) - src3.d[i + j];
  68         if (dst.d[i + j] != res.d[i + j])
  69           check_fails++;
  70       }
  71   return check_fails++;
  72 }
  73
  74 static void
  75 fma4_test (void)
  76 {
  77   int i;
  78
  79   init_nmsubps ();
  80
  81   for (i = 0; i < NUM; i++)
  82     dst.x[i] = _mm256_nmsub_ps (src1.x[i], src2.x[i], src3.x[i]);
  83
  84   if (check_nmsubps (&dst.x[i], &src1.f[i * 4], &src2.f[i * 4], &src3.f[i * 4]))
  85     abort ();
  86
  87   init_nmsubpd ();
  88
  89   for (i = 0; i < NUM; i++)
  90     dst.y[i] = _mm256_nmsub_pd (src1.y[i], src2.y[i], src3.y[i]);
  91
  92   if (check_nmsubpd (&dst.y[i], &src1.d[i * 2], &src2.d[i * 2], &src3.d[i * 2]))
  93     abort ();
  94
  95 }