Rework naming of test suite files

tests/negr_d.c

@@ -0,0 +1,30 @@
+#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_DOUBLE };
+  jit_arg_t args[1];
+  const jit_anyreg_t regs[] = { { .fpr=JIT_F0 } };
+
+  jit_receive(j, 1, abi, args);
+  jit_load_args(j, 1, abi, args, regs);
+
+  jit_negr_d(j, JIT_F0, JIT_F0);
+  jit_retr_d(j, JIT_F0);
+
+  double (*f)(double) = jit_end(j, NULL);
+
+  ASSERT(f(0.0) == -0.0);
+  ASSERT(f(0.5) == -0.5);
+  ASSERT(f(1.0 / 0.0) == -1.0 / 0.0);
+  ASSERT(f(-1.25) == 1.25);
+}
+
+int
+main (int argc, char *argv[])
+{
+  return main_helper(argc, argv, run_test);
+}