x86-asm: Accept 'q' modifier

In inline extended asm '%q1' refers to the 64bit register of operand 1.
2016-12-15 17:47:06 +01:00
parent 8531de319a
commit d5d881d9e9
2 changed files with 12 additions and 1 deletions
@@ -2584,6 +2584,17 @@ unsigned long mconstraint_test(struct struct1231 *r)
    return ret + a[0];
 }

+#ifdef __x86_64__
+int fls64(unsigned long long x)
+{
+  int bitpos = -1;
+  asm("bsrq %1,%q0"
+      : "+r" (bitpos)
+      : "rm" (x));
+  return bitpos + 1;
+}
+#endif
+
 unsigned int set;

 void asm_test(void)