mirror of
https://github.com/microsoft/vcpkg.git
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24 lines
736 B
Diff
24 lines
736 B
Diff
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diff --git a/src/lib/utils/mul128.h b/src/lib/utils/mul128.h
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index 8cdaae2..54bb670 100644
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--- a/src/lib/utils/mul128.h
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+++ b/src/lib/utils/mul128.h
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@@ -39,10 +39,15 @@ namespace Botan {
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#elif defined(BOTAN_BUILD_COMPILER_IS_MSVC) && defined(BOTAN_TARGET_CPU_HAS_NATIVE_64BIT)
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#include <intrin.h>
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-#pragma intrinsic(_umul128)
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-
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-#define BOTAN_FAST_64X64_MUL(a,b,lo,hi) \
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+#if defined(_M_ARM64)
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+ #pragma intrinsic(__umulh)
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+ #define BOTAN_FAST_64X64_MUL(a,b,lo,hi) \
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+ do { *lo = a * b; *hi = __umulh(a, b); } while(0)
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+#else
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+ #pragma intrinsic(_umul128)
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+ #define BOTAN_FAST_64X64_MUL(a,b,lo,hi) \
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do { *lo = _umul128(a, b, hi); } while(0)
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+#endif
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#elif defined(BOTAN_USE_GCC_INLINE_ASM)
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