From: sandeep <sandeep@4a8a32a2-be11-0410-ad9d-d568d2c75423>
Date: Thu, 15 Nov 2001 22:49:57 +0000 (+0000)
Subject: improved heuristics for spilling
X-Git-Url: https://git.gag.com/?a=commitdiff_plain;h=52afdbe479c0dfeca5bb872c9935a30e3e4b46dd;p=fw%2Fsdcc

improved heuristics for spilling


git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@1598 4a8a32a2-be11-0410-ad9d-d568d2c75423
---

diff --git a/src/pic/ralloc.c b/src/pic/ralloc.c
index 95c75778..4fc0b827 100644
--- a/src/pic/ralloc.c
+++ b/src/pic/ralloc.c
@@ -1611,8 +1611,11 @@ serialRegAssign (eBBlock ** ebbs, int count)
 			/* if none of the liveRanges have a spillLocation then better
 			   to spill this one than anything else already assigned to registers */
 			if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
-			    spillThis (sym);
-			    continue;
+			    /* if this is local to this block then we might find a block spil */
+			    if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
+				spillThis (sym);
+				continue;
+			    }
 			}
 		    }
 		}
diff --git a/src/z80/ralloc.c b/src/z80/ralloc.c
index 93a29153..936d8b77 100644
--- a/src/z80/ralloc.c
+++ b/src/z80/ralloc.c
@@ -1143,8 +1143,11 @@ serialRegAssign (eBBlock ** ebbs, int count)
 			      /* if none of the liveRanges have a spillLocation then better
 				 to spill this one than anything else already assigned to registers */
 			      if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
+				  /* if this is local to this block then we might find a block spil */
+				  if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
 				      spillThis (sym);
 				      continue;
+				  }
 			      }
 		      }
 	      }