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Enable ARM NEON on ARM64 processors by default #1435

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Enable ARM NEON on ARM64 processors by default #1435

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220964d
Enable ARM NEON on ARM64
plzombie Jan 13, 2023
89f598d
Check if STBI_NEON already defined so no warning will be produced
plzombie Jan 13, 2023
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10 changes: 9 additions & 1 deletion stb_image.h
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Original file line number Diff line number Diff line change
Expand Up @@ -692,6 +692,8 @@ typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
#define STBI__X64_TARGET
#elif defined(__i386) || defined(_M_IX86)
#define STBI__X86_TARGET
#elif defined(__aarch64__) || defined(_M_ARM64)
#define STBI__ARM64_TARGET
#endif

#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD)
Expand Down Expand Up @@ -774,9 +776,15 @@ static int stbi__sse2_available(void)
#endif

// ARM NEON
#if defined(STBI_NO_SIMD) && defined(STBI_NEON)
#if defined(STBI_NO_SIMD)
#if defined(STBI_NEON)
#undef STBI_NEON
#endif
#elif defined(STBI__ARM64_TARGET)
#if !defined(STBI_NEON)
#define STBI_NEON
#endif
#endif

#ifdef STBI_NEON
#include <arm_neon.h>
Expand Down