/* */
/* */
/* */
-/* (C) 2001-2009 Ullrich von Bassewitz */
-/* Roemerstrasse 52 */
-/* D-70794 Filderstadt */
-/* EMail: uz@cc65.org */
+/* (C) 2001-2010, Ullrich von Bassewitz */
+/* Roemerstrasse 52 */
+/* D-70794 Filderstadt */
+/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
#include "cpu.h"
#include "print.h"
#include "xmalloc.h"
+#include "xsprintf.h"
/* cc65 */
#include "asmlabel.h"
*/
{
unsigned Changes = 0;
+ unsigned I;
/* Generate register info */
CS_GenRegInfo (S);
/* Walk over the entries */
- unsigned I = 0;
+ I = 0;
while (I < CS_GetEntryCount (S)) {
CodeEntry* N;
CS_InsertEntry (S, X, I+1);
}
- /* Delete the call to shlax */
+ /* Delete the call to shrax */
CS_DelEntry (S, I);
/* Remember, we had changes */
+static unsigned OptLoad2 (CodeSeg* S)
+/* Replace calls to ldaxysp by inline code */
+{
+ unsigned I;
+ unsigned Changes = 0;
+
+ /* Walk over the entries */
+ I = 0;
+ while (I < CS_GetEntryCount (S)) {
+
+ CodeEntry* E;
+
+ /* Get next entry */
+ E = CS_GetEntry (S, I);
+
+ /* Check for the sequence */
+ if (CE_IsCallTo (E, "ldaxysp")) {
+
+ CodeEntry* X;
+
+ /* lda (sp),y */
+ X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "sp", 0, E->LI);
+ CS_InsertEntry (S, X, I+1);
+
+ /* tax */
+ X = NewCodeEntry (OP65_TAX, AM65_IMP, 0, 0, E->LI);
+ CS_InsertEntry (S, X, I+2);
+
+ /* dey */
+ X = NewCodeEntry (OP65_DEY, AM65_IMP, 0, 0, E->LI);
+ CS_InsertEntry (S, X, I+3);
+
+ /* lda (sp),y */
+ X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "sp", 0, E->LI);
+ CS_InsertEntry (S, X, I+4);
+
+ /* Now remove the call to the subroutine */
+ CS_DelEntry (S, I);
+
+ /* Remember, we had changes */
+ ++Changes;
+
+ }
+
+ /* Next entry */
+ ++I;
+ }
+
+ /* Return the number of changes made */
+ return Changes;
+}
+
+
+
/*****************************************************************************/
/* Optimize stores through pointers */
/*****************************************************************************/
+static unsigned OptPtrStore3 (CodeSeg* S)
+/* Search for the sequence:
+ *
+ * lda #<(label+0)
+ * ldx #>(label+0)
+ * ldy aaa
+ * clc
+ * adc (sp),y
+ * bcc L
+ * inx
+ * L: jsr pushax
+ * ldx #$00
+ * lda yyy
+ * ldy #$00
+ * jsr staspidx
+ *
+ * and replace it by:
+ *
+ * ldy aaa
+ * ldx #$00
+ * lda (sp),y
+ * tay
+ * lda yyy
+ * sta label,y
+ */
+{
+ unsigned Changes = 0;
+
+ /* Walk over the entries */
+ unsigned I = 0;
+ while (I < CS_GetEntryCount (S)) {
+
+ CodeEntry* L[12];
+ unsigned Len;
+
+ /* Get next entry */
+ L[0] = CS_GetEntry (S, I);
+
+ /* Check for the sequence */
+ if (L[0]->OPC == OP65_LDA &&
+ L[0]->AM == AM65_IMM &&
+ CS_GetEntries (S, L+1, I+1, 11) &&
+ L[1]->OPC == OP65_LDX &&
+ L[1]->AM == AM65_IMM &&
+ L[2]->OPC == OP65_LDY &&
+ L[3]->OPC == OP65_CLC &&
+ L[4]->OPC == OP65_ADC &&
+ L[4]->AM == AM65_ZP_INDY &&
+ strcmp (L[4]->Arg, "sp") == 0 &&
+ (L[5]->OPC == OP65_BCC || L[5]->OPC == OP65_JCC) &&
+ L[5]->JumpTo != 0 &&
+ L[5]->JumpTo->Owner == L[7] &&
+ L[6]->OPC == OP65_INX &&
+ CE_IsCallTo (L[7], "pushax") &&
+ L[8]->OPC == OP65_LDX &&
+ L[9]->OPC == OP65_LDA &&
+ L[10]->OPC == OP65_LDY &&
+ CE_IsKnownImm (L[10], 0) &&
+ CE_IsCallTo (L[11], "staspidx") &&
+ !CS_RangeHasLabel (S, I+1, 6) &&
+ !CS_RangeHasLabel (S, I+8, 4) &&
+ /* Check the label last because this is quite costly */
+ (Len = strlen (L[0]->Arg)) > 3 &&
+ L[0]->Arg[0] == '<' &&
+ L[0]->Arg[1] == '(' &&
+ strlen (L[1]->Arg) == Len &&
+ L[1]->Arg[0] == '>' &&
+ memcmp (L[0]->Arg+1, L[1]->Arg+1, Len-1) == 0) {
+
+ CodeEntry* X;
+ char* Label;
+
+ /* We will create all the new stuff behind the current one so
+ * we keep the line references.
+ */
+ X = NewCodeEntry (OP65_LDY, L[2]->AM, L[2]->Arg, 0, L[2]->LI);
+ CS_InsertEntry (S, X, I+12);
+
+ X = NewCodeEntry (OP65_LDX, L[8]->AM, L[8]->Arg, 0, L[8]->LI);
+ CS_InsertEntry (S, X, I+13);
+
+ X = NewCodeEntry (OP65_LDA, L[4]->AM, L[4]->Arg, 0, L[4]->LI);
+ CS_InsertEntry (S, X, I+14);
+
+ X = NewCodeEntry (OP65_TAY, AM65_IMP, 0, 0, L[4]->LI);
+ CS_InsertEntry (S, X, I+15);
+
+ X = NewCodeEntry (OP65_LDA, L[9]->AM, L[9]->Arg, 0, L[9]->LI);
+ CS_InsertEntry (S, X, I+16);
+
+ Label = memcpy (xmalloc (Len-2), L[0]->Arg+2, Len-3);
+ Label[Len-3] = '\0';
+ X = NewCodeEntry (OP65_STA, AM65_ABSY, Label, 0, L[11]->LI);
+ CS_InsertEntry (S, X, I+17);
+ xfree (Label);
+
+ /* Remove the old code */
+ CS_DelEntries (S, I, 12);
+
+ /* Remember, we had changes */
+ ++Changes;
+
+ }
+
+ /* Next entry */
+ ++I;
+
+ }
+
+ /* Return the number of changes made */
+ return Changes;
+}
+
+
+
/*****************************************************************************/
/* Decouple operations */
/*****************************************************************************/
case REG_PTR1_LO:
Arg = MakeHexArg (In->Ptr1Lo);
- X = NewCodeEntry (OP65_LDA, AM65_IMM, Arg, 0, E->LI);
+ X = NewCodeEntry (OP65_LDA, AM65_IMM, Arg, 0, E->LI);
break;
case REG_PTR1_HI:
case OP65_TYA:
if (E->RI->In.RegY >= 0) {
- Arg = MakeHexArg (In->RegY);
+ Arg = MakeHexArg (In->RegY);
X = NewCodeEntry (OP65_LDA, AM65_IMM, Arg, 0, E->LI);
}
break;
+/*****************************************************************************/
+/* Optimize stack pointer ops */
+/*****************************************************************************/
+
+
+
+static unsigned IsDecSP (const CodeEntry* E)
+/* Check if this is an insn that decrements the stack pointer. If so, return
+ * the decrement. If not, return zero.
+ * The function expects E to be a subroutine call.
+ */
+{
+ if (strncmp (E->Arg, "decsp", 5) == 0) {
+ if (E->Arg[5] >= '1' && E->Arg[5] <= '8') {
+ return (E->Arg[5] - '0');
+ }
+ } else if (strcmp (E->Arg, "subysp") == 0 && RegValIsKnown (E->RI->In.RegY)) {
+ return E->RI->In.RegY;
+ }
+
+ /* If we come here, it's not a decsp op */
+ return 0;
+}
+
+
+
+static unsigned OptStackPtrOps (CodeSeg* S)
+/* Merge adjacent calls to decsp into one. NOTE: This function won't merge all
+ * known cases!
+ */
+{
+ unsigned Changes = 0;
+ unsigned I;
+
+ /* Generate register info for the following step */
+ CS_GenRegInfo (S);
+
+ /* Walk over the entries */
+ I = 0;
+ while (I < CS_GetEntryCount (S)) {
+
+ unsigned Dec1;
+ unsigned Dec2;
+ const CodeEntry* N;
+
+ /* Get the next entry */
+ const CodeEntry* E = CS_GetEntry (S, I);
+
+ /* Check for decspn or subysp */
+ if (E->OPC == OP65_JSR &&
+ (Dec1 = IsDecSP (E)) > 0 &&
+ (N = CS_GetNextEntry (S, I)) != 0 &&
+ (Dec2 = IsDecSP (N)) > 0 &&
+ (Dec1 += Dec2) <= 255 &&
+ !CE_HasLabel (N)) {
+
+ CodeEntry* X;
+ char Buf[20];
+
+ /* We can combine the two */
+ if (Dec1 <= 8) {
+ /* Insert a call to decsp */
+ xsprintf (Buf, sizeof (Buf), "decsp%u", Dec1);
+ X = NewCodeEntry (OP65_JSR, AM65_ABS, Buf, 0, N->LI);
+ CS_InsertEntry (S, X, I+2);
+ } else {
+ /* Insert a call to subysp */
+ const char* Arg = MakeHexArg (Dec1);
+ X = NewCodeEntry (OP65_LDY, AM65_IMM, Arg, 0, N->LI);
+ CS_InsertEntry (S, X, I+2);
+ X = NewCodeEntry (OP65_JSR, AM65_ABS, "subysp", 0, N->LI);
+ CS_InsertEntry (S, X, I+3);
+ }
+
+ /* Delete the old code */
+ CS_DelEntries (S, I, 2);
+
+ /* Regenerate register info */
+ CS_GenRegInfo (S);
+
+ /* Remember we had changes */
+ ++Changes;
+
+ } else {
+
+ /* Next entry */
+ ++I;
+ }
+
+ }
+
+ /* Free register info */
+ CS_FreeRegInfo (S);
+
+ /* Return the number of changes made */
+ return Changes;
+}
+
+
+
/*****************************************************************************/
/* struct OptFunc */
/*****************************************************************************/
static OptFunc DOptDeadJumps = { OptDeadJumps, "OptDeadJumps", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptDecouple = { OptDecouple, "OptDecouple", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptDupLoads = { OptDupLoads, "OptDupLoads", 0, 0, 0, 0, 0, 0 };
+static OptFunc DOptIndLoads1 = { OptIndLoads1, "OptIndLoads1", 0, 0, 0, 0, 0, 0 };
+static OptFunc DOptIndLoads2 = { OptIndLoads2, "OptIndLoads2", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptJumpCascades = { OptJumpCascades, "OptJumpCascades", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptJumpTarget1 = { OptJumpTarget1, "OptJumpTarget1", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptJumpTarget2 = { OptJumpTarget2, "OptJumpTarget2", 100, 0, 0, 0, 0, 0 };
+static OptFunc DOptJumpTarget3 = { OptJumpTarget3, "OptJumpTarget3", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptLoad1 = { OptLoad1, "OptLoad1", 100, 0, 0, 0, 0, 0 };
+static OptFunc DOptLoad2 = { OptLoad2, "OptLoad2", 200, 0, 0, 0, 0, 0 };
static OptFunc DOptRTS = { OptRTS, "OptRTS", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptRTSJumps1 = { OptRTSJumps1, "OptRTSJumps1", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptRTSJumps2 = { OptRTSJumps2, "OptRTSJumps2", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad6 = { OptPtrLoad6, "OptPtrLoad6", 60, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad7 = { OptPtrLoad7, "OptPtrLoad7", 140, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad11 = { OptPtrLoad11, "OptPtrLoad11", 92, 0, 0, 0, 0, 0 };
-static OptFunc DOptPtrLoad12 = { OptPtrLoad12, "OptPtrLoad12", 50, 0, 0, 0, 0, 0 };
-static OptFunc DOptPtrLoad13 = { OptPtrLoad13, "OptPtrLoad13", 65, 0, 0, 0, 0, 0 };
+static OptFunc DOptPtrLoad12 = { OptPtrLoad12, "OptPtrLoad12", 50, 0, 0, 0, 0, 0 };
+static OptFunc DOptPtrLoad13 = { OptPtrLoad13, "OptPtrLoad13", 65, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad14 = { OptPtrLoad14, "OptPtrLoad14", 108, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad15 = { OptPtrLoad15, "OptPtrLoad15", 86, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad16 = { OptPtrLoad16, "OptPtrLoad16", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad17 = { OptPtrLoad17, "OptPtrLoad17", 190, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrStore1 = { OptPtrStore1, "OptPtrStore1", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrStore2 = { OptPtrStore2, "OptPtrStore2", 40, 0, 0, 0, 0, 0 };
+static OptFunc DOptPtrStore3 = { OptPtrStore3, "OptPtrStore3", 50, 0, 0, 0, 0, 0 };
static OptFunc DOptPush1 = { OptPush1, "OptPush1", 65, 0, 0, 0, 0, 0 };
static OptFunc DOptPush2 = { OptPush2, "OptPush2", 50, 0, 0, 0, 0, 0 };
static OptFunc DOptPushPop = { OptPushPop, "OptPushPop", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptSize1 = { OptSize1, "OptSize1", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptSize2 = { OptSize2, "OptSize2", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptStackOps = { OptStackOps, "OptStackOps", 100, 0, 0, 0, 0, 0 };
+static OptFunc DOptStackPtrOps = { OptStackPtrOps, "OptStackPtrOps", 50, 0, 0, 0, 0, 0 };
static OptFunc DOptStore1 = { OptStore1, "OptStore1", 70, 0, 0, 0, 0, 0 };
-static OptFunc DOptStore2 = { OptStore2, "OptStore2", 220, 0, 0, 0, 0, 0 };
+static OptFunc DOptStore2 = { OptStore2, "OptStore2", 115, 0, 0, 0, 0, 0 };
static OptFunc DOptStore3 = { OptStore3, "OptStore3", 120, 0, 0, 0, 0, 0 };
static OptFunc DOptStore4 = { OptStore4, "OptStore4", 50, 0, 0, 0, 0, 0 };
static OptFunc DOptStore5 = { OptStore5, "OptStore5", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptSub1 = { OptSub1, "OptSub1", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptSub2 = { OptSub2, "OptSub2", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptSub3 = { OptSub3, "OptSub3", 100, 0, 0, 0, 0, 0 };
-static OptFunc DOptTest1 = { OptTest1, "OptTest1", 100, 0, 0, 0, 0, 0 };
+static OptFunc DOptTest1 = { OptTest1, "OptTest1", 65, 0, 0, 0, 0, 0 };
+static OptFunc DOptTest2 = { OptTest2, "OptTest2", 50, 0, 0, 0, 0, 0 };
static OptFunc DOptTransfers1 = { OptTransfers1, "OptTransfers1", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptTransfers2 = { OptTransfers2, "OptTransfers2", 60, 0, 0, 0, 0, 0 };
static OptFunc DOptTransfers3 = { OptTransfers3, "OptTransfers3", 65, 0, 0, 0, 0, 0 };
&DOptDeadJumps,
&DOptDecouple,
&DOptDupLoads,
+ &DOptIndLoads1,
+ &DOptIndLoads2,
&DOptJumpCascades,
&DOptJumpTarget1,
&DOptJumpTarget2,
+ &DOptJumpTarget3,
&DOptLoad1,
+ &DOptLoad2,
&DOptNegA1,
&DOptNegA2,
&DOptNegAX1,
&DOptPtrLoad7,
&DOptPtrStore1,
&DOptPtrStore2,
+ &DOptPtrStore3,
&DOptPush1,
&DOptPush2,
&DOptPushPop,
&DOptSize1,
&DOptSize2,
&DOptStackOps,
+ &DOptStackPtrOps,
&DOptStore1,
&DOptStore2,
&DOptStore3,
&DOptSub2,
&DOptSub3,
&DOptTest1,
+ &DOptTest2,
&DOptTransfers1,
&DOptTransfers2,
&DOptTransfers3,
{
unsigned Changes = 0;
+ Changes += RunOptFunc (S, &DOptStackPtrOps, 5);
Changes += RunOptFunc (S, &DOptPtrStore1, 1);
Changes += RunOptFunc (S, &DOptPtrStore2, 1);
+ Changes += RunOptFunc (S, &DOptPtrStore3, 1);
Changes += RunOptFunc (S, &DOptAdd3, 1); /* Before OptPtrLoad5! */
Changes += RunOptFunc (S, &DOptPtrLoad1, 1);
Changes += RunOptFunc (S, &DOptPtrLoad2, 1);
Changes += RunOptFunc (S, &DOptAdd1, 1);
Changes += RunOptFunc (S, &DOptAdd2, 1);
Changes += RunOptFunc (S, &DOptAdd4, 1);
+ Changes += RunOptFunc (S, &DOptAdd5, 1);
+ Changes += RunOptFunc (S, &DOptAdd6, 1);
+ Changes += RunOptFunc (S, &DOptAdd6, 1);
+ Changes += RunOptFunc (S, &DOptSub1, 1);
+ Changes += RunOptFunc (S, &DOptSub3, 1);
Changes += RunOptFunc (S, &DOptStore4, 1);
Changes += RunOptFunc (S, &DOptStore5, 1);
Changes += RunOptFunc (S, &DOptShift1, 1);
C += RunOptFunc (S, &DOptNegA1, 1);
C += RunOptFunc (S, &DOptNegA2, 1);
+ C += RunOptFunc (S, &DOptStackOps, 1);
C += RunOptFunc (S, &DOptSub1, 1);
C += RunOptFunc (S, &DOptSub2, 1);
C += RunOptFunc (S, &DOptSub3, 1);
C += RunOptFunc (S, &DOptAdd5, 1);
C += RunOptFunc (S, &DOptAdd6, 1);
- C += RunOptFunc (S, &DOptStackOps, 1);
C += RunOptFunc (S, &DOptJumpCascades, 1);
C += RunOptFunc (S, &DOptDeadJumps, 1);
C += RunOptFunc (S, &DOptRTS, 1);
C += RunOptFunc (S, &DOptCmp9, 1);
C += RunOptFunc (S, &DOptTest1, 1);
C += RunOptFunc (S, &DOptLoad1, 1);
+ C += RunOptFunc (S, &DOptJumpTarget3, 1); /* After OptCondBranches2 */
C += RunOptFunc (S, &DOptUnusedLoads, 1);
C += RunOptFunc (S, &DOptUnusedStores, 1);
C += RunOptFunc (S, &DOptDupLoads, 1);
static unsigned RunOptGroup4 (CodeSeg* S)
+/* Run another round of pattern replacements. These are done late, since there
+ * may be better replacements before.
+ */
+{
+ unsigned Changes = 0;
+
+ /* Repeat some of the steps here */
+ Changes += RunOptFunc (S, &DOptPush1, 1);
+ Changes += RunOptFunc (S, &DOptPush2, 1);
+ Changes += RunOptFunc (S, &DOptUnusedLoads, 1);
+ Changes += RunOptFunc (S, &DOptTest2, 1);
+ Changes += RunOptFunc (S, &DOptTransfers2, 1);
+ Changes += RunOptFunc (S, &DOptLoad2, 1);
+
+ /* Return the number of changes */
+ return Changes;
+}
+
+
+
+static unsigned RunOptGroup5 (CodeSeg* S)
/* 65C02 specific optimizations. */
{
unsigned Changes = 0;
-static unsigned RunOptGroup5 (CodeSeg* S)
-/* Run another round of pattern replacements. These are done late, since there
- * may be better replacements before.
+static unsigned RunOptGroup6 (CodeSeg* S)
+/* This one is quite special. It tries to replace "lda (sp),y" by "lda (sp,x)".
+ * The latter is ony cycle slower, but if we're able to remove the necessary
+ * load of the Y register, because X is zero anyway, we gain 1 cycle and
+ * shorten the code by one (transfer) or two bytes (load). So what we do is
+ * to replace the insns, remove unused loads, and then change back all insns
+ * where Y is still zero (meaning that the load has not been removed).
*/
{
unsigned Changes = 0;
- Changes += RunOptFunc (S, &DOptPush1, 1);
- Changes += RunOptFunc (S, &DOptPush2, 1);
- /* Repeat some of the other optimizations now */
- Changes += RunOptFunc (S, &DOptUnusedLoads, 1);
- Changes += RunOptFunc (S, &DOptTransfers2, 1);
+ /* This group will only run for a standard 6502, because the 65C02 has a
+ * better addressing mode that covers this case.
+ */
+ if ((CPUIsets[CPU] & CPU_ISET_65SC02) == 0) {
+ Changes += RunOptFunc (S, &DOptIndLoads1, 1);
+ Changes += RunOptFunc (S, &DOptUnusedLoads, 1);
+ Changes += RunOptFunc (S, &DOptIndLoads2, 1);
+ }
/* Return the number of changes */
return Changes;
-static unsigned RunOptGroup6 (CodeSeg* S)
+static unsigned RunOptGroup7 (CodeSeg* S)
/* The last group of optimization steps. Adjust branches, do size optimizations.
*/
{
RunOptGroup4 (S);
RunOptGroup5 (S);
RunOptGroup6 (S);
+ RunOptGroup7 (S);
/* Write statistics */
if (StatFileName) {
projects / cc65 / blobdiff