1 files changed, 20 insertions, 0 deletions
diff --git a/fmv.h b/fmv.h
new file mode 100644
index 0000000..0aa439d
--- /dev/null
+++ b/fmv.h
@@ -0,0 +1,20 @@
+#ifndef FMV_H
+
+#if HAVE_FUNC_ATTRIBUTE_IFUNC
+#if defined(__has_attribute)
+#if __has_attribute(target_clones)
+#if defined(__x86_64)
+
+// see https://gcc.gnu.org/wiki/FunctionMultiVersioning
+#define PF_TARGET_CLONES __attribute__((target_clones("avx","sse4.2","sse3","sse2","sse","default")))
+#define HAVE_PF_TARGET_CLONES  1
+#endif
+#endif
+#endif
+#endif
+
+#ifndef PF_TARGET_CLONES
+#define PF_TARGET_CLONES
+#endif
+
+#endif