Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party

xz/tests/bcj_test.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       bcj_test.c
+/// \brief      Source code of compress_prepared_bcj_*
+///
+/// This is a simple program that should make the compiler to generate
+/// PC-relative branches, jumps, and calls. The compiled files can then
+/// be used to test the branch conversion filters. Note that this program
+/// itself does nothing useful.
+///
+/// Compiling: gcc -std=c99 -fPIC -c bcj_test.c
+/// Don't optimize or strip.
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+extern int jump(int a, int b);
+
+
+extern int
+call(int a, int b)
+{
+        if (a < b)
+                a = jump(a, b);
+
+        return a;
+}
+
+
+extern int
+jump(int a, int b)
+{
+        // The loop generates conditional jump backwards.
+        while (1) {
+                if (a < b) {
+                        a *= 2;
+                        a += 3 * b;
+                        break;
+                } else {
+                        // Put enough code here to prevent JMP SHORT on x86.
+                        a += b;
+                        a /= 2;
+                        b += b % 5;
+                        a -= b / 3;
+                        b = 2 * b + a - 1;
+                        a *= b + a + 1;
+                        b += a - 1;
+                        a += b * 2 - a / 5;
+                }
+        }
+
+        return a;
+}
+
+
+int
+main(int argc, char **argv)
+{
+        int a = call(argc, argc + 1);
+        return a == 0;
+}