X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=src%2Fcc65%2Fcoptcmp.h;h=7efbeada89a787bd22298db452d8b3d89ded22c6;hb=35e1184901ca38bdb2e56d154ed3b71f6096eacc;hp=39a79121f3f529da8f90bf5cdf41c16cfc9ca602;hpb=3692fd40dab79f0464a9a3da33baa5932f29b90d;p=cc65

diff --git a/src/cc65/coptcmp.h b/src/cc65/coptcmp.h
index 39a79121f..7efbeada8 100644
--- a/src/cc65/coptcmp.h
+++ b/src/cc65/coptcmp.h
@@ -6,10 +6,10 @@
 /*                                                                           */
 /*                                                                           */
 /*                                                                           */
-/* (C) 2001-2004 Ullrich von Bassewitz                                       */
-/*               Römerstrasse 52                                             */
-/*               D-70794 Filderstadt                                         */
-/* EMail:        uz@cc65.org                                                 */
+/* (C) 2001-2009, Ullrich von Bassewitz                                      */
+/*                Roemerstrasse 52                                           */
+/*                D-70794 Filderstadt                                        */
+/* EMail:         uz@cc65.org                                                */
 /*                                                                           */
 /*                                                                           */
 /* This software is provided 'as-is', without any expressed or implied       */
@@ -153,6 +153,19 @@ unsigned OptCmp8 (CodeSeg* S);
  * the result of the compare is known.
  */
 
+unsigned OptCmp9 (CodeSeg* S);
+/* Search for the sequence
+ *
+ *    sbc       xx
+ *    bvs/bvc   L
+ *    eor       #$80
+ * L: asl       a
+ *    bcc/bcs   somewhere
+ *
+ * If A is not used later (which should be the case), we can branch on the N
+ * flag instead of the carry flag and remove the asl.
+ */
+
 
 
 /* End of coptcmp.h */