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

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target fma4 } */
   3 /* { dg-options "-O2 -mfma4" } */
   4
   5 #include "fma4-check.h"
   6
   7 #include <x86intrin.h>
   8 #include <string.h>
   9
  10 #define NUM 20
  11
  12 union
  13 {
  14   __m256 x[NUM];
  15   float f[NUM * 8];
  16   __m256d y[NUM];
  17   double d[NUM * 4];
  18 } dst, res, src1, src2, src3;
  19
  20 /* Note that in macc*,msub*,mnmacc* and mnsub* instructions, the intermdediate
  21    product is not rounded, only the addition is rounded. */
  22
  23 static void
  24 init_msubps ()
  25 {
  26   int i;
  27   for (i = 0; i < NUM * 8; i++)
  28     {
  29       src1.f[i] = i;
  30       src2.f[i] = i + 10;
  31       src3.f[i] = i + 20;
  32     }
  33 }
  34
  35 static void
  36 init_msubpd ()
  37 {
  38   int i;
  39   for (i = 0; i < NUM * 4; i++)
  40     {
  41       src1.d[i] = i;
  42       src2.d[i] = i + 10;
  43       src3.d[i] = i + 20;
  44     }
  45 }
  46
  47 static int
  48 check_msubps ()
  49 {
  50   int i, j, check_fails = 0;
  51   for (i = 0; i < NUM * 8; i = i + 8)
  52     for (j = 0; j < 8; j++)
  53       {
  54         res.f[i + j] = (src1.f[i + j] * src2.f[i + j]) - src3.f[i + j];
  55         if (dst.f[i + j] != res.f[i + j])
  56           check_fails++;
  57       }
  58   return check_fails++;
  59 }
  60
  61 static int
  62 check_msubpd ()
  63 {
  64   int i, j, check_fails = 0;
  65   for (i = 0; i < NUM * 4; i = i + 4)
  66     for (j = 0; j < 4; j++)
  67       {
  68         res.d[i + j] = (src1.d[i + j] * src2.d[i + j]) - src3.d[i + j];
  69         if (dst.d[i + j] != res.d[i + j])
  70           check_fails++;
  71       }
  72   return check_fails++;
  73 }
  74
  75 static void
  76 fma4_test (void)
  77 {
  78   int i;
  79
  80   init_msubps ();
  81
  82   for (i = 0; i < NUM; i++)
  83     dst.x[i] = _mm256_msub_ps (src1.x[i], src2.x[i], src3.x[i]);
  84
  85   if (check_msubps ())
  86     abort ();
  87
  88   init_msubpd ();
  89
  90   for (i = 0; i < NUM; i++)
  91     dst.y[i] = _mm256_msub_pd (src1.y[i], src2.y[i], src3.y[i]);
  92
  93   if (check_msubpd ())
  94     abort ();
  95
  96 }