Fixed two compiler warnings.

[cc65] / src / cc65 / coptcmp.h

diff --git a/src/cc65/coptcmp.h b/src/cc65/coptcmp.h
index 13ef998070e3408264983464e7997ef47691af49..7efbeada89a787bd22298db452d8b3d89ded22c6 100644 (file)
--- a/src/cc65/coptcmp.h
+++ b/src/cc65/coptcmp.h
@@ -6,10 +6,10 @@
 /*                                                                           */
 /*                                                                           */
 /*                                                                           */
-/* (C) 2001      Ullrich von Bassewitz                                       */
-/*               Wacholderweg 14                                             */
-/*               D-70597 Stuttgart                                           */
-/* 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       */
@@ -63,6 +63,18 @@ unsigned OptBoolTrans (CodeSeg* S);
 
 
 unsigned OptCmp1 (CodeSeg* S);
+/* Search for the sequence
+ *
+ *     ldx     xx
+ *     stx     tmp1
+ *     ora     tmp1
+ *
+ * and replace it by
+ *
+ *     ora     xx
+ */
+
+unsigned OptCmp2 (CodeSeg* S);
 /* Search for the sequence
  *
  *     stx     xx
@@ -75,7 +87,7 @@ unsigned OptCmp1 (CodeSeg* S);
  *     ora     xx
  */
 
-unsigned OptCmp2 (CodeSeg* S);
+unsigned OptCmp3 (CodeSeg* S);
 /* Search for
  *
  *             lda/and/ora/eor ...
@@ -89,7 +101,7 @@ unsigned OptCmp2 (CodeSeg* S);
  * and remove the cmp.
  */
 
-unsigned OptCmp3 (CodeSeg* S);
+unsigned OptCmp4 (CodeSeg* S);
 /* Search for
  *
  *     lda     x
@@ -110,7 +122,7 @@ unsigned OptCmp3 (CodeSeg* S);
  * of this instruction.
  */
 
-unsigned OptCmp4 (CodeSeg* S);
+unsigned OptCmp5 (CodeSeg* S);
 /* Optimize compares of local variables:
  *
  *      ldy     #o
@@ -124,23 +136,36 @@ unsigned OptCmp4 (CodeSeg* S);
  *      jne/jeq L2
  */
 
-unsigned OptCmp5 (CodeSeg* S);
+unsigned OptCmp6 (CodeSeg* S);
 /* Search for calls to compare subroutines followed by a conditional branch
  * and replace them by cheaper versions, since the branch means that the
  * boolean value returned by these routines is not needed (we may also check
  * that explicitly, but for the current code generator it is always true).
  */
 
-unsigned OptCmp6 (CodeSeg* S);
+unsigned OptCmp7 (CodeSeg* S);
 /* Search for a sequence ldx/txa/branch and remove the txa if A is not
  * used later.
  */
 
-unsigned OptCmp7 (CodeSeg* S);
+unsigned OptCmp8 (CodeSeg* S);
 /* Check for register compares where the contents of the register and therefore
  * 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 */