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build: Make simd.h and thread.h compile for ARM64EC with clang-cl #5635

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Merged
lgritz merged 1 commit into from
Oct 29, 2026
Merged

build: Make simd.h and thread.h compile for ARM64EC with clang-cl #5635

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8 changes: 4 additions & 4 deletions src/include/OpenImageIO/simd.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3152,7 +3152,7 @@ vfloat16 nmsub (const vfloat16& a, const vfloat16& b, const vfloat16& c); // -a*
// Try to set the flush_zero_mode CPU flag on x86. Return true if we are
// able, otherwise false (because it's not available on that platform).
inline bool set_flush_zero_mode (bool on) {
#if (defined(__x86_64__) || defined(__i386__)) && !defined(__CUDA_ARCH__)
#if (defined(__x86_64__) || defined(__i386__)) && !defined(__CUDA_ARCH__) && !defined(__arm64ec__)
_MM_SET_FLUSH_ZERO_MODE (on ? _MM_FLUSH_ZERO_ON : _MM_FLUSH_ZERO_OFF);
return true;
#endif
Expand All @@ -3162,7 +3162,7 @@ inline bool set_flush_zero_mode (bool on) {
// Try to set the denorms_zero_mode CPU flag on x86. Return true if we are
// able, otherwise false (because it's not available on that platform).
inline bool set_denorms_zero_mode (bool on) {
#if (defined(__x86_64__) || defined(__i386__)) && !defined(__CUDA_ARCH__)
#if (defined(__x86_64__) || defined(__i386__)) && !defined(__CUDA_ARCH__) && !defined(__arm64ec__)
_MM_SET_DENORMALS_ZERO_MODE (on ? _MM_DENORMALS_ZERO_ON : _MM_DENORMALS_ZERO_OFF);
return true;
#endif
Expand All @@ -3171,15 +3171,15 @@ inline bool set_denorms_zero_mode (bool on) {

// Get the flush_zero_mode CPU flag on x86.
inline bool get_flush_zero_mode () {
#if (defined(__x86_64__) || defined(__i386__)) && !defined(__CUDA_ARCH__)
#if (defined(__x86_64__) || defined(__i386__)) && !defined(__CUDA_ARCH__) && !defined(__arm64ec__)
return _MM_GET_FLUSH_ZERO_MODE() == _MM_FLUSH_ZERO_ON;
#endif
return false;
}

// Get the denorms_zero_mode CPU flag on x86.
inline bool get_denorms_zero_mode () {
#if (defined(__x86_64__) || defined(__i386__)) && !defined(__CUDA_ARCH__)
#if (defined(__x86_64__) || defined(__i386__)) && !defined(__CUDA_ARCH__) && !defined(__arm64ec__)
return _MM_GET_DENORMALS_ZERO_MODE() == _MM_DENORMALS_ZERO_ON;
#endif
return false;
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5 changes: 3 additions & 2 deletions src/include/OpenImageIO/thread.h
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Expand Up @@ -154,9 +154,10 @@ pause(int delay) noexcept
#elif defined(_MSC_VER)
// A reimplementation of winnt.h YieldProcessor,
// to avoid including windows headers.
# if defined(_M_AMD64)
# if defined(_M_AMD64) && !defined(_M_ARM64EC)
_mm_pause();
# elif defined(_M_ARM64) || defined(_M_HYBRID_X86_ARM64)
# elif defined(_M_ARM64) || defined(_M_ARM64EC) \
|| defined(_M_HYBRID_X86_ARM64)
__dmb(_ARM64_BARRIER_ISHST);
__yield();
# elif defined(_M_ARM)
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