1 files changed, 46 insertions, 0 deletions
diff --git a/tests/bxsubr.c b/tests/bxsubr.c
new file mode 100644
index 0000000..50f5dbb
--- /dev/null
+++ b/tests/bxsubr.c
@@ -0,0 +1,46 @@
+#include "test.h"
+
+static const jit_word_t overflowed = 0xcabba9e5;
+
+static void
+run_test(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
+{
+	jit_begin(j, arena_base, arena_size);
+	size_t align = jit_enter_jit_abi(j, 0, 0, 0);
+	jit_load_args_2(j, jit_operand_gpr (JIT_OPERAND_ABI_WORD, JIT_R0),
+	                jit_operand_gpr (JIT_OPERAND_ABI_WORD, JIT_R1));
+
+	jit_reloc_t r = jit_bxsubr(j, JIT_R0, JIT_R1);
+	jit_movi(j, JIT_R0, overflowed);
+	jit_patch_here(j, r);
+	jit_leave_jit_abi(j, 0, 0, align);
+	jit_retr(j, JIT_R0);
+
+	jit_word_t (*f)(jit_word_t, jit_word_t) = jit_end(j, NULL);
+
+	ASSERT(f(0, 0) == 0);
+	ASSERT(f(0, 1) == -1);
+	ASSERT(f(1, 1) == 0);
+	ASSERT(f(1, -1) == 2);
+
+#if EJIT_WORDSIZE == 32
+	ASSERT(f(0xffffffff, 0xffffffff) == 0);
+	ASSERT(f(0x7fffffff, 0) == 0x7fffffff);
+	ASSERT(f(0x7fffffff, 1) == 0x7ffffffe);
+	ASSERT(f(0x7fffffff, 0x7fffffff) == 0);
+	ASSERT(f(0x80000000, 0x7fffffff) == overflowed);
+	ASSERT(f(0x7fffffff, 0x80000000) == overflowed);
+	ASSERT(f(0x80000000, 0x80000000) == 0);
+#else
+	ASSERT(f(0x7fffffffffffffff, 0x7fffffffffffffff) == 0);
+	ASSERT(f(0x7fffffffffffffff, 0x8000000000000000) == overflowed);
+	ASSERT(f(0x8000000000000000, 0x7fffffffffffffff) == overflowed);
+	ASSERT(f(0x8000000000000000, 0x8000000000000000) == 0);
+#endif
+}
+
+int
+main (int argc, char *argv[])
+{
+	return main_helper(argc, argv, run_test);
+}