Merge 2ae92376b7 into 0816badf3a

simple flag to only compile the portable implementation

got the idea from https://github.com/BLAKE3-team/BLAKE3/issues/364#issuecomment-2001979018

could name it BLAKE3_PORTABLE instead, maybe, idk

c/blake3_dispatch.c

@@ -4,9 +4,12 @@
 
 #include "blake3_impl.h"
 
-#if defined(IS_X86)
 #if defined(_MSC_VER)
 #include <Windows.h>
+#endif
+
+#if defined(IS_X86)
+#if defined(_MSC_VER)
 #include <intrin.h>
 #elif defined(__GNUC__)
 #include <immintrin.h>

c/blake3_impl.h

@@ -20,6 +20,14 @@ enum blake3_flags {
   DERIVE_KEY_MATERIAL = 1 << 6,
 };
 
+#ifdef BLAKE3_FORCE_PORTABLE
+#define BLAKE3_NO_SSE2
+#define BLAKE3_NO_SSE41
+#define BLAKE3_NO_AVX2
+#define BLAKE3_NO_AVX512
+#define BLAKE3_USE_NEON 0
+#endif
+
 // This C implementation tries to support recent versions of GCC, Clang, and
 // MSVC.
 #if defined(_MSC_VER)
@@ -28,7 +36,7 @@ enum blake3_flags {
 #define INLINE static inline __attribute__((always_inline))
 #endif
 
-#if defined(__x86_64__) || defined(_M_X64) 
+#if (defined(__x86_64__) || defined(_M_X64)) && !defined(_M_ARM64EC)
 #define IS_X86
 #define IS_X86_64
 #endif
@@ -38,7 +46,7 @@ enum blake3_flags {
 #define IS_X86_32
 #endif
 
-#if defined(__aarch64__) || defined(_M_ARM64)
+#if defined(__aarch64__) || defined(_M_ARM64) || defined(_M_ARM64EC)
 #define IS_AARCH64
 #endif