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Added optimization for complax.
git-svn-id: svn://svn.cc65.org/cc65/trunk@5771 b7a2c559-68d2-44c3-8de9-860c34a00d81
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@ -601,6 +601,7 @@ static OptFunc DOptCmp6 = { OptCmp6, "OptCmp6", 100, 0,
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static OptFunc DOptCmp7 = { OptCmp7, "OptCmp7", 85, 0, 0, 0, 0, 0 };
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static OptFunc DOptCmp8 = { OptCmp8, "OptCmp8", 50, 0, 0, 0, 0, 0 };
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static OptFunc DOptCmp9 = { OptCmp9, "OptCmp9", 85, 0, 0, 0, 0, 0 };
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static OptFunc DOptComplAX1 = { OptComplAX1, "OptComplAX1", 65, 0, 0, 0, 0, 0 };
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static OptFunc DOptCondBranches1= { OptCondBranches1,"OptCondBranches1", 80, 0, 0, 0, 0, 0 };
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static OptFunc DOptCondBranches2= { OptCondBranches2,"OptCondBranches2", 0, 0, 0, 0, 0, 0 };
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static OptFunc DOptDeadCode = { OptDeadCode, "OptDeadCode", 100, 0, 0, 0, 0, 0 };
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@ -698,6 +699,7 @@ static OptFunc* OptFuncs[] = {
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&DOptCmp7,
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&DOptCmp8,
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&DOptCmp9,
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&DOptComplAX1,
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&DOptCondBranches1,
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&DOptCondBranches2,
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&DOptDeadCode,
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@ -1088,6 +1090,7 @@ static unsigned RunOptGroup3 (CodeSeg* S)
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C += RunOptFunc (S, &DOptStackOps, 3);
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C += RunOptFunc (S, &DOptShift1, 1);
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C += RunOptFunc (S, &DOptShift4, 1);
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C += RunOptFunc (S, &DOptComplAX1, 1);
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C += RunOptFunc (S, &DOptSub1, 1);
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C += RunOptFunc (S, &DOptSub2, 1);
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C += RunOptFunc (S, &DOptSub3, 1);
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@ -557,3 +557,54 @@ unsigned OptNegAX2 (CodeSeg* S)
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/*****************************************************************************/
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/* complax optimizations */
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/*****************************************************************************/
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unsigned OptComplAX1 (CodeSeg* S)
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/* Search for a call to complax and replace it by
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*
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* eor #$FF
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*
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* if X isn't used later.
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*/
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{
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unsigned Changes = 0;
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unsigned I;
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/* Walk over the entries */
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I = 0;
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while (I < CS_GetEntryCount (S)) {
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/* Get next entry */
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CodeEntry* E = CS_GetEntry (S, I);
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/* Check if this is a call to negax, and if X isn't used later */
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if (CE_IsCallTo (E, "complax") && !RegXUsed (S, I+1)) {
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CodeEntry* X;
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/* Add replacement code behind */
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X = NewCodeEntry (OP65_EOR, AM65_IMM, "$FF", 0, E->LI);
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CS_InsertEntry (S, X, I+1);
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/* Delete the call to negax */
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CS_DelEntry (S, I);
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/* We had changes */
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++Changes;
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}
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/* Next entry */
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++I;
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}
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/* Return the number of changes made */
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return Changes;
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}
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@ -164,6 +164,22 @@ unsigned OptNegAX2 (CodeSeg* S);
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/*****************************************************************************/
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/* complax optimizations */
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/*****************************************************************************/
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unsigned OptComplAX1 (CodeSeg* S);
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/* Search for a call to complax and replace it by
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*
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* eor #$FF
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*
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* if X isn't used later.
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*/
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/* End of coptneg.h */
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#endif
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