/*****************************************************************************/
/* */
-/* coptind.h */
+/* coptind.h */
/* */
-/* Environment independent low level optimizations */
+/* Environment independent low level optimizations */
/* */
/* */
/* */
/*****************************************************************************/
-/* Code */
+/* Code */
/*****************************************************************************/
* label, the dead code elimination should take care of it.
*/
-unsigned OptJumpTarget (CodeSeg* S);
+unsigned OptJumpTarget1 (CodeSeg* S);
/* If the instruction preceeding an unconditional branch is the same as the
* instruction preceeding the jump target, the jump target may be moved
* one entry back. This is a size optimization, since the instruction before
* the branch gets removed.
*/
-unsigned OptCondBranches (CodeSeg* S);
+unsigned OptJumpTarget2 (CodeSeg* S);
+/* If a bcs jumps to a sec insn or a bcc jumps to clc, skip this insn, since
+ * it's job is already done.
+ */
+
+unsigned OptJumpTarget3 (CodeSeg* S);
+/* Jumps to load instructions of a register, that do already have the matching
+ * register contents may skip the load instruction, since it's job is already
+ * done.
+ */
+
+unsigned OptCondBranches1 (CodeSeg* S);
/* If an immidiate load of a register is followed by a conditional jump that
* is never taken because the load of the register sets the flags in such a
* manner, remove the conditional branch.
*/
+unsigned OptCondBranches2 (CodeSeg* S);
+/* If on entry to a "rol a" instruction the accu is zero, and a beq/bne follows,
+ * we can remove the rol and branch on the state of the carry.
+ */
+
unsigned OptUnusedLoads (CodeSeg* S);
/* Remove loads of registers where the value loaded is not used later. */
* store of the first register if this is possible.
*/
+unsigned OptTransfers4 (CodeSeg* S);
+/* Replace a load of a register followed by a transfer insn of the same register
+ * by a load of the second register if possible.
+ */
+
unsigned OptPushPop (CodeSeg* S);
/* Remove a PHA/PLA sequence were A is not used later */
unsigned OptBranchDist (CodeSeg* S);
/* Change branches for the distance needed. */
+unsigned OptIndLoads1 (CodeSeg* S);
+/* Change
+ *
+ * lda (zp),y
+ *
+ * into
+ *
+ * lda (zp,x)
+ *
+ * provided that x and y are both zero.
+ */
+unsigned OptIndLoads2 (CodeSeg* S);
+/* Change
+ *
+ * lda (zp,x)
+ *
+ * into
+ *
+ * lda (zp),y
+ *
+ * provided that x and y are both zero.
+ */
-/* End of coptind.h */
-#endif
+/* End of coptind.h */
+#endif