fix type conversion warnings

Author: martin-frbg

test/compare_sgemm_sbgemm.c

@@ -81,6 +81,16 @@ float16to32 (bfloat16_bits f16)
   return f32.v;
 }
 
+float
+float32to16 (float32_bits f32)
+{
+  bfloat16_bits f16;
+  f16.bits.s = f32.bits.s;
+  f16.bits.e = f32.bits.e;
+  f16.bits.m = (uint32_t) f32.bits.m >> 16;
+  return f32.v;
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -108,16 +118,16 @@ main (int argc, char *argv[])
 	      A[j * k + i] = ((FLOAT) rand () / (FLOAT) RAND_MAX) + 0.5;
 	      B[j * k + i] = ((FLOAT) rand () / (FLOAT) RAND_MAX) + 0.5;
 	      C[j * k + i] = 0;
-	      AA[j * k + i].v = *(uint32_t *) & A[j * k + i] >> 16;
-	      BB[j * k + i].v = *(uint32_t *) & B[j * k + i] >> 16;
+	      AA[j * k + i].v = float32to16( A[j * k + i] );
+	      BB[j * k + i].v = float32to16( B[j * k + i] );
 	      CC[j * k + i] = 0;
 	      DD[j * k + i] = 0;
 	    }
 	}
       SGEMM (&transA, &transB, &m, &n, &k, &alpha, A,
 	     &m, B, &k, &beta, C, &m);
-      SBGEMM (&transA, &transB, &m, &n, &k, &alpha, AA,
-	      &m, BB, &k, &beta, CC, &m);
+      SBGEMM (&transA, &transB, &m, &n, &k, &alpha, (bfloat16*) AA,
+	      &m, (bfloat16*)BB, &k, &beta, CC, &m);
       for (i = 0; i < n; i++)
 	for (j = 0; j < m; j++)
 	    if (fabs (CC[i * m + j] - C[i * m + j]) > 1.0)