Fixed missing preprocessor macro in prng.c

src/prng.c

@@ -47,11 +47,10 @@ nwipe_prng_t nwipe_xoroshiro256_prng = { "XORoshiro-256", nwipe_xoroshiro256_prn
 /* RC4 PRNG Structure */
 nwipe_prng_t nwipe_rc4_prng = { "RC4", nwipe_rc4_prng_init, nwipe_rc4_prng_read };
 
-// Function to check CPUID and test if SSE4.1 is supported
-#if defined( _MSC_VER )
-#include <intrin.h>  // For MSVC compilers to use __cpuid
-#else
-#include <cpuid.h>  // For GCC/Clang compilers to use __cpuid
+#if defined( __AVX2__ ) || defined( __SSE4_2__ )
+#include <cpuid.h>
+#if defined( __AVX2__ )
+#include <immintrin.h>  // For _xgetbv and AVX intrinsics
 #endif
 
 // Function to check if SSE4.2 is supported
@@ -67,6 +66,7 @@ int check_sse42_support()
 // Function to check if AVX2 is supported
 int check_avx2_support()
 {
+#if defined( __AVX2__ )
     uint32_t eax, ebx, ecx, edx;
 
     // First check if OS supports XGETBV and AVX
@@ -88,8 +88,26 @@ int check_avx2_support()
     // Check if AVX2 is supported (bit 5 of EBX from CPUID leaf 7)
     __cpuid_count( 7, 0, eax, ebx, ecx, edx );
     return ( ebx & ( 1 << 5 ) ) != 0;
+#else
+    return 0;  // AVX2 not supported by this compiler or platform
+#endif
 }
 
+#else
+
+// Fallback if neither AVX2 nor SSE4.2 is available or supported by the compiler/platform
+int check_sse42_support()
+{
+    return 0;  // SSE4.2 is not supported
+}
+
+int check_avx2_support()
+{
+    return 0;  // AVX2 is not supported
+}
+
+#endif
+
 /* Print given number of bytes from unsigned integer number to a byte stream buffer starting with low-endian. */
 static inline void u32_to_buffer( u8* restrict buffer, u32 val, const int len )
 {

src/rc4/rc4_prng.c

@@ -181,9 +181,6 @@ void rc4_genrand_4096_to_buf( rc4_state_t* state, unsigned char* bufpos )
      */
     for( n = 0; n < OUTPUT_DATA_LENGTH; n += 4 )
     {
-        /* Prefetch the next S-Box values into the cache to optimize memory access */
-        _mm_prefetch( (const char*) &state->S[state->i + 16], _MM_HINT_T0 );
-
         // Increment the counter (CTR mode)
         state->counter++;
 
@@ -220,6 +217,7 @@ void rc4_genrand_4096_to_buf( rc4_state_t* state, unsigned char* bufpos )
     memcpy( bufpos, temp_buffer, OUTPUT_DATA_LENGTH );
 }
 
+
 /*
  * Function: rc4_genrand_4096_to_buf_sse42
  * ----------------------------