+// Earlier, the regparm attribute was used whenever __GNUC__ >= 2, but this
+// generated warnings on PPC. So the use is restricted further.
+// See http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html that says
+// regparm (number)
+// On the Intel 386, the regparm attribute causes the compiler to pass
+// arguments number one to number if they are of integral type in
+// registers EAX, EDX, and ECX instead of on the stack. Functions that
+// take a variable number of arguments will continue to be passed all of
+// their arguments on the stack.
+#if __GNUC__ >= 2 && (defined(x86_64_TARGET_ARCH) || defined(i386_TARGET_ARCH))