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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 21:12:04 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 21:12:04 +0000
commiteac54b7c4aec25060d7bd856f7cdc290943d6aae (patch)
tree9a6d81c9f88df4698e746d63d14ddafeddd918b8 /tests/bcj_test.c
parentInitial commit. (diff)
downloadxz-utils-eac54b7c4aec25060d7bd856f7cdc290943d6aae.tar.xz
xz-utils-eac54b7c4aec25060d7bd856f7cdc290943d6aae.zip
Adding upstream version 5.4.1.upstream/5.4.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/bcj_test.c')
-rw-r--r--tests/bcj_test.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/tests/bcj_test.c b/tests/bcj_test.c
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+///////////////////////////////////////////////////////////////////////////////
+//
+/// \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;
+}