Rework naming of test suite files

tests/rshi_u.c

@@ -0,0 +1,32 @@
+#include "test.h"
+
+static void
+run_test(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
+{
+  jit_begin(j, arena_base, arena_size);
+
+  const jit_arg_abi_t abi[] = { JIT_ARG_ABI_INTMAX };
+  jit_arg_t args[1];
+  const jit_anyreg_t regs[] = { { .gpr=JIT_R0 } };
+
+  jit_receive(j, 1, abi, args);
+  jit_load_args(j, 1, abi, args, regs);
+
+  jit_rshi_u(j, JIT_R0, JIT_R0, 31);
+  jit_retr(j, JIT_R0);
+
+  intmax_t (*f)(intmax_t) = jit_end(j, NULL);
+
+#if __WORDSIZE == 32
+  ASSERT(f(0x80000000) == 1);
+#else
+  ASSERT(f(0x80000000) == 1);
+  ASSERT(f(0x8000000000000000) == 0x100000000);
+#endif
+}
+
+int
+main (int argc, char *argv[])
+{
+  return main_helper(argc, argv, run_test);
+}