secp256k1

secp256k1/cmake/CheckX86_64Assembly.cmake

@@ -0,0 +1,14 @@
+include(CheckCSourceCompiles)
+
+function(check_x86_64_assembly)
+  check_c_source_compiles("
+    #include <stdint.h>
+
+    int main()
+    {
+      uint64_t a = 11, tmp;
+      __asm__ __volatile__(\"movq $0x100000000,%1; mulq %%rsi\" : \"+a\"(a) : \"S\"(tmp) : \"cc\", \"%rdx\");
+    }
+  " HAVE_X86_64_ASM)
+  set(HAVE_X86_64_ASM ${HAVE_X86_64_ASM} PARENT_SCOPE)
+endfunction()