[SDPA] remove keyword static in exp (#3291)

* [sdpa] remove keyword static in exp

Author: Valentine233

csrc/cpu/aten/kernels/FlashAttentionKrnl.cpp

@@ -130,27 +130,24 @@ inline Vectorized<scalar_t> exp_u20(Vectorized<scalar_t> data) {
 inline Vectorized<float> exp_u20(Vectorized<float> data) {
   __m512 values = __m512(data);
   // A faster version of exp with ULP=20
-  static __m512 vec_factorial_1 =
-      _mm512_set1_ps(0.999999701f); // 1/factorial(1)
-  static __m512 vec_factorial_2 =
-      _mm512_set1_ps(0.499991506f); // 1/factorial(2)
-  static __m512 vec_factorial_3 =
-      _mm512_set1_ps(0.166676521f); // 1/factorial(3)
-  static __m512 vec_factorial_4 =
+  const __m512 vec_factorial_1 = _mm512_set1_ps(0.999999701f); // 1/factorial(1)
+  const __m512 vec_factorial_2 = _mm512_set1_ps(0.499991506f); // 1/factorial(2)
+  const __m512 vec_factorial_3 = _mm512_set1_ps(0.166676521f); // 1/factorial(3)
+  const __m512 vec_factorial_4 =
       _mm512_set1_ps(0.0418978221f); // 1/factorial(4)
-  static __m512 vec_factorial_5 =
+  const __m512 vec_factorial_5 =
       _mm512_set1_ps(0.00828929059f); // 1/factorial(5)
-  static __m512 vec_exp_log2ef =
+  const __m512 vec_exp_log2ef =
       (__m512)_mm512_set1_epi32(0x3fb8aa3b); // log2(e)
-  static __m512 vec_half = _mm512_set1_ps(0.5f);
-  static __m512 vec_one = _mm512_set1_ps(1.f);
-  static __m512 vec_zero = _mm512_set1_ps(0.f);
-  static __m512 vec_two = _mm512_set1_ps(2.f);
-  static __m512 vec_ln2f = (__m512)_mm512_set1_epi32(0x3f317218); // ln(2)
-  static __m512 vec_ln_flt_min = (__m512)_mm512_set1_epi32(0xc2aeac50);
-  static __m512 vec_ln_flt_max = (__m512)_mm512_set1_epi32(0x42b17218);
-  static __m512i vec_127 = _mm512_set1_epi32(0x0000007f);
-  static int n_mantissa_bits = 23;
+  const __m512 vec_half = _mm512_set1_ps(0.5f);
+  const __m512 vec_one = _mm512_set1_ps(1.f);
+  const __m512 vec_zero = _mm512_set1_ps(0.f);
+  const __m512 vec_two = _mm512_set1_ps(2.f);
+  const __m512 vec_ln2f = (__m512)_mm512_set1_epi32(0x3f317218); // ln(2)
+  const __m512 vec_ln_flt_min = (__m512)_mm512_set1_epi32(0xc2aeac50);
+  const __m512 vec_ln_flt_max = (__m512)_mm512_set1_epi32(0x42b17218);
+  const __m512i vec_127 = _mm512_set1_epi32(0x0000007f);
+  const int n_mantissa_bits = 23;
 
   // exp(x) =
   // = exp(n * ln(2) + r) // divide x by ln(2) and get quot and rem