Squashed 'external/xbyak/' content from commit 431abd86

git-subtree-dir: external/xbyak
git-subtree-split: 431abd865e70a46d56f5aa0e1f87572decb60169

sample/no_flags.cpp

@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <xbyak/xbyak.h>
+
+struct Code : Xbyak::CodeGenerator {
+	Code(bool nf) {
+		xor_(eax, eax); // CF = 0
+		mov(eax, -1);
+		if (nf) {
+			puts("no flags (with T_nf)");
+			add(eax|T_nf, eax, 1); // does not change CF
+		} else {
+			puts("change flags (without T_nf)");
+			add(eax, eax, 1); // CF = 1
+		}
+		adc(eax, 0); // eax = CF ? 1 : 0
+		ret();
+	}
+};
+
+int main() {
+	for (int i = 0; i < 2; i++) {
+		Code c(i);
+		printf("i=%d ret=%d\n", i, c.getCode<int(*)()>()());
+	}
+}