* src/avr/ralloc.c (serialRegAssign),

[fw/sdcc] / src / hc08 / ralloc.c

diff --git a/src/hc08/ralloc.c b/src/hc08/ralloc.c
index 4669e852cc04def5a22e83efd51c9edae947ccc0..25c75138bf9ab286e144dae5ad27ef3e0e5b2d7e 100644 (file)
--- a/src/hc08/ralloc.c
+++ b/src/hc08/ralloc.c
@@ -1289,6 +1289,16 @@ serialRegAssign (eBBlock ** ebbs, int count)
                    continue;                 
                }
 
+               /* If the live range preceeds the point of definition 
+                  then ideally we must take into account registers that 
+                  have been allocated after sym->liveFrom but freed
+                  before ic->seq. This is complicated, so spill this
+                  symbol instead and let fillGaps handle the allocation. */
+               if (sym->liveFrom < ic->seq) {
+                   spillThis (sym);
+                   continue;                 
+               }
+
                /* if it has a spillocation & is used less than
                   all other live ranges then spill this */
                if (willCS) {