reggroups

1 files changed, 12 insertions, 2 deletions

diff --git a/reggroups.c b/reggroups.c
index 5e5479a..9e4592a 100644
--- a/reggroups.c
+++ b/reggroups.c
@@ -129,7 +129,7 @@ reg_alloc_alloc (reg_alloc_t *ra)
      * - an internal error in the register allocator has
      *   produced a situation where a register is in used
      *   but no group claims it is loaded.
-     * - all registers have been allocated in the current group
+     * - all registers in the current group have been allocated
      */
     for (i = 0; i < MAX_REGISTERS; ++i)
     {
@@ -151,7 +151,17 @@ reg_alloc_alloc (reg_alloc_t *ra)
  * may be moved to another register
  */
 op_t
-reg_alloc_preserve (reg_alloc_t *ra, op_t reg);
+reg_alloc_preserve (reg_alloc_t *ra, reg_t reg)
+{
+    int idx = reg_to_index (ra, reg);
+
+    if (ra->active->allocated[idx])
+    {
+	/* Already allocated in this group, so
+	 * we have to move it somewhere else
+	 */
+    }
+}
 
 void
 reg_alloc_free (reg_alloc_t *ra, op_t reg);