Change 16-bit swizzle from vector to C arrays

Author: sterrettm2

src/avx512-16bit-common.h

@@ -14,11 +14,11 @@ struct avx512_16bit_swizzle_ops {
         __m512i v = vtype::cast_to(reg);
 
         if constexpr (scale == 2) {
-            std::vector<uint16_t> arr
+            constexpr static uint16_t arr[]
                     = {1,  0,  3,  2,  5,  4,  7,  6,  9,  8,  11,
                        10, 13, 12, 15, 14, 17, 16, 19, 18, 21, 20,
                        23, 22, 25, 24, 27, 26, 29, 28, 31, 30};
-            __m512i mask = _mm512_loadu_si512(arr.data());
+            __m512i mask = _mm512_loadu_si512(arr);
             v = _mm512_permutexvar_epi16(mask, v);
         }
         else if constexpr (scale == 4) {
@@ -48,27 +48,27 @@ struct avx512_16bit_swizzle_ops {
 
         if constexpr (scale == 2) { return swap_n<vtype, 2>(reg); }
         else if constexpr (scale == 4) {
-            std::vector<uint16_t> arr
+            constexpr static uint16_t arr[]
                     = {3,  2,  1,  0,  7,  6,  5,  4,  11, 10, 9,
                        8,  15, 14, 13, 12, 19, 18, 17, 16, 23, 22,
                        21, 20, 27, 26, 25, 24, 31, 30, 29, 28};
-            __m512i mask = _mm512_loadu_si512(arr.data());
+            __m512i mask = _mm512_loadu_si512(arr);
             v = _mm512_permutexvar_epi16(mask, v);
         }
         else if constexpr (scale == 8) {
-            std::vector<uint16_t> arr
+            constexpr static int16_t arr[]
                     = {7,  6,  5,  4,  3,  2,  1,  0,  15, 14, 13,
                        12, 11, 10, 9,  8,  23, 22, 21, 20, 19, 18,
                        17, 16, 31, 30, 29, 28, 27, 26, 25, 24};
-            __m512i mask = _mm512_loadu_si512(arr.data());
+            __m512i mask = _mm512_loadu_si512(arr);
             v = _mm512_permutexvar_epi16(mask, v);
         }
         else if constexpr (scale == 16) {
-            std::vector<uint16_t> arr
+            constexpr static uint16_t arr[]
                     = {15, 14, 13, 12, 11, 10, 9,  8,  7,  6,  5,
                        4,  3,  2,  1,  0,  31, 30, 29, 28, 27, 26,
                        25, 24, 23, 22, 21, 20, 19, 18, 17, 16};
-            __m512i mask = _mm512_loadu_si512(arr.data());
+            __m512i mask = _mm512_loadu_si512(arr);
             v = _mm512_permutexvar_epi16(mask, v);
         }
         else if constexpr (scale == 32) {