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-rw-r--r--Alc/helpers.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/Alc/helpers.c b/Alc/helpers.c
index 45e137fd..6de1fdc3 100644
--- a/Alc/helpers.c
+++ b/Alc/helpers.c
@@ -121,6 +121,16 @@ DEFINE_PROPERTYKEY(PKEY_AudioEndpoint_GUID, 0x1da5d803, 0xd492, 0x4edd, 0x8c, 0x
extern inline ALuint NextPowerOf2(ALuint value);
extern inline size_t RoundUp(size_t value, size_t r);
extern inline ALint fastf2i(ALfloat f);
+#ifndef __GNUC__
+#if defined(HAVE_BITSCANFORWARD64_INTRINSIC)
+extern inline int msvc64_ctz64(ALuint64 v);
+#elif defined(HAVE_BITSCANFORWARD_INTRINSIC)
+extern inline int msvc_ctz64(ALuint64 v);
+#else
+extern inline int fallback_popcnt64(ALuint64 v);
+extern inline int fallback_ctz64(ALuint64 value);
+#endif
+#endif
int CPUCapFlags = 0;