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Optimizations

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git-svn-id: svn://svn.cc65.org/cc65/trunk@1009 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2001-10-04 11:34:18 +00:00
parent 8d6f5a2fca
commit 0c09cc7242
2 changed files with 203 additions and 105 deletions
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26
src/cc65/codegen.c
View File

@ -2879,6 +2879,15 @@ void g_asr (unsigned flags, unsigned long val)
case CF_CHAR:
case CF_INT:
if (val >= 8 && (flags & CF_UNSIGNED)) {
AddCodeLine ("txa");
ldxconst (0);
val -= 8;
if (val == 0) {
/* Done */
return;
}
}
if (val >= 1 && val <= 4) {
if (flags & CF_UNSIGNED) {
AddCodeLine ("jsr shrax%ld", val);
@ -2886,10 +2895,6 @@ void g_asr (unsigned flags, unsigned long val)
AddCodeLine ("jsr asrax%ld", val);
}
return;
} else if (val == 8 && (flags & CF_UNSIGNED)) {
AddCodeLine ("txa");
ldxconst (0);
return;
}
break;
@ -2962,6 +2967,15 @@ void g_asl (unsigned flags, unsigned long val)
case CF_CHAR:
case CF_INT:
if (val >= 8) {
AddCodeLine ("tax");
AddCodeLine ("lda #$00");
val -= 8;
if (val == 0) {
/* Done */
return;
}
}
if (val >= 1 && val <= 4) {
if (flags & CF_UNSIGNED) {
AddCodeLine ("jsr shlax%ld", val);
@ -2969,10 +2983,6 @@ void g_asl (unsigned flags, unsigned long val)
AddCodeLine ("jsr aslax%ld", val);
}
return;
} else if (val == 8) {
AddCodeLine ("tax");
AddCodeLine ("lda #$00");
return;
}
break;

124
src/cc65/coptstop.c
View File

@ -161,31 +161,54 @@ static unsigned Opt_tosaddax (CodeSeg* S, unsigned Push, unsigned Add,
const char* ZPLo, const char* ZPHi)
/* Optimize the tosaddax sequence if possible */
{
CodeEntry* P;
CodeEntry* N;
CodeEntry* X;
CodeEntry* PushEntry;
CodeEntry* AddEntry;
int DirectAdd;
/* We need the entry behind the add */
CHECK ((N = CS_GetNextEntry (S, Add)) != 0);
/* And the entry before the push */
CHECK ((P = CS_GetPrevEntry (S, Push)) != 0);
/* Get the push entry */
PushEntry = CS_GetEntry (S, Push);
/* Check the entry before the push, if it's a lda instruction with an
* addressing mode that does not use an additional index register. If
* so, we may use this location for the add and must not save the
* value in the zero page location.
*/
DirectAdd = (P->OPC == OP65_LDA &&
(P->AM == AM65_IMM || P->AM == AM65_ZP || P->AM == AM65_ABS));
/* Store the value into the zeropage instead of pushing it */
X = NewCodeEntry (OP65_STX, AM65_ZP, ZPHi, 0, PushEntry->LI);
CS_InsertEntry (S, X, Push+1);
++Add; /* Correct the index */
if (!DirectAdd) {
X = NewCodeEntry (OP65_STA, AM65_ZP, ZPLo, 0, PushEntry->LI);
CS_InsertEntry (S, X, Push+1);
X = NewCodeEntry (OP65_STX, AM65_ZP, ZPHi, 0, PushEntry->LI);
CS_InsertEntry (S, X, Push+2);
++Add; /* Correct the index */
}
/* Correct the index of the add and get a pointer to the entry */
Add += 2;
/* Get a pointer to the add entry */
AddEntry = CS_GetEntry (S, Add);
/* Inline the add */
X = NewCodeEntry (OP65_CLC, AM65_IMP, 0, 0, AddEntry->LI);
CS_InsertEntry (S, X, Add+1);
if (DirectAdd) {
/* Add from variable location */
X = NewCodeEntry (OP65_ADC, P->AM, P->Arg, 0, AddEntry->LI);
} else {
/* Add from temp storage */
X = NewCodeEntry (OP65_ADC, AM65_ZP, ZPLo, 0, AddEntry->LI);
}
CS_InsertEntry (S, X, Add+2);
if (PushEntry->RI->In.RegX == 0) {
/* The high byte is the value in X plus the carry */
@ -240,25 +263,47 @@ static unsigned Opt_tosandax (CodeSeg* S, unsigned Push, unsigned And,
const char* ZPLo, const char* ZPHi)
/* Optimize the tosandax sequence if possible */
{
CodeEntry* P;
CodeEntry* X;
CodeEntry* PushEntry;
CodeEntry* AndEntry;
int DirectAnd;
/* Get the entry before the push */
CHECK ((P = CS_GetPrevEntry (S, Push)) != 0);
/* Get the push entry */
PushEntry = CS_GetEntry (S, Push);
/* Check the entry before the push, if it's a lda instruction with an
* addressing mode that does not use an additional index register. If
* so, we may use this location for the and and must not save the
* value in the zero page location.
*/
DirectAnd = (P->OPC == OP65_LDA &&
(P->AM == AM65_IMM || P->AM == AM65_ZP || P->AM == AM65_ABS));
/* Store the value into the zeropage instead of pushing it */
X = NewCodeEntry (OP65_STX, AM65_ZP, ZPHi, 0, PushEntry->LI);
CS_InsertEntry (S, X, Push+1);
++And; /* Correct the index */
if (!DirectAnd) {
X = NewCodeEntry (OP65_STA, AM65_ZP, ZPLo, 0, PushEntry->LI);
CS_InsertEntry (S, X, Push+1);
X = NewCodeEntry (OP65_STX, AM65_ZP, ZPHi, 0, PushEntry->LI);
CS_InsertEntry (S, X, Push+2);
++And; /* Correct the index */
}
/* Correct the index of the add and get a pointer to the entry */
And += 2;
/* Get a pointer to the and entry */
AndEntry = CS_GetEntry (S, And);
/* Inline the and */
if (DirectAnd) {
/* And with variable location */
X = NewCodeEntry (OP65_AND, P->AM, P->Arg, 0, AndEntry->LI);
} else {
/* And with temp storage */
X = NewCodeEntry (OP65_AND, AM65_ZP, ZPLo, 0, AndEntry->LI);
}
CS_InsertEntry (S, X, And+1);
if (PushEntry->RI->In.RegX == 0 || AndEntry->RI->In.RegX == 0) {
/* The high byte is zero */
@ -292,25 +337,46 @@ static unsigned Opt_tosorax (CodeSeg* S, unsigned Push, unsigned Or,
const char* ZPLo, const char* ZPHi)
/* Optimize the tosorax sequence if possible */
{
CodeEntry* P;
CodeEntry* X;
CodeEntry* PushEntry;
CodeEntry* OrEntry;
int DirectOr;
/* Get the entry before the push */
CHECK ((P = CS_GetPrevEntry (S, Push)) != 0);
/* Get the push entry */
PushEntry = CS_GetEntry (S, Push);
/* Check the entry before the push, if it's a lda instruction with an
* addressing mode that does not use an additional index register. If
* so, we may use this location for the or and must not save the
* value in the zero page location.
*/
DirectOr = (P->OPC == OP65_LDA &&
(P->AM == AM65_IMM || P->AM == AM65_ZP || P->AM == AM65_ABS));
/* Store the value into the zeropage instead of pushing it */
X = NewCodeEntry (OP65_STX, AM65_ZP, ZPHi, 0, PushEntry->LI);
CS_InsertEntry (S, X, Push+1);
++Or; /* Correct the index */
if (DirectOr) {
X = NewCodeEntry (OP65_STA, AM65_ZP, ZPLo, 0, PushEntry->LI);
CS_InsertEntry (S, X, Push+1);
X = NewCodeEntry (OP65_STX, AM65_ZP, ZPHi, 0, PushEntry->LI);
CS_InsertEntry (S, X, Push+2);
++Or; /* Correct the index */
}
/* Correct the index of the add and get a pointer to the entry */
Or += 2;
/* Get a pointer to the or entry */
OrEntry = CS_GetEntry (S, Or);
/* Inline the or */
if (DirectOr) {
/* Or with variable location */
X = NewCodeEntry (OP65_ORA, P->AM, P->Arg, 0, OrEntry->LI);
} else {
X = NewCodeEntry (OP65_ORA, AM65_ZP, ZPLo, 0, OrEntry->LI);
}
CS_InsertEntry (S, X, Or+1);
if (PushEntry->RI->In.RegX >= 0 && OrEntry->RI->In.RegX >= 0) {
/* Both values known, precalculate the result */
@ -345,27 +411,49 @@ static unsigned Opt_tosorax (CodeSeg* S, unsigned Push, unsigned Or,
static unsigned Opt_tosxorax (CodeSeg* S, unsigned Push, unsigned Xor,
const char* ZPLo, const char* ZPHi)
/* Optimize the tosorax sequence if possible */
/* Optimize the tosxorax sequence if possible */
{
CodeEntry* P;
CodeEntry* X;
CodeEntry* PushEntry;
CodeEntry* XorEntry;
int DirectXor;
/* Get the entry before the push */
CHECK ((P = CS_GetPrevEntry (S, Push)) != 0);
/* Get the push entry */
PushEntry = CS_GetEntry (S, Push);
/* Check the entry before the push, if it's a lda instruction with an
* addressing mode that does not use an additional index register. If
* so, we may use this location for the xor and must not save the
* value in the zero page location.
*/
DirectXor = (P->OPC == OP65_LDA &&
(P->AM == AM65_IMM || P->AM == AM65_ZP || P->AM == AM65_ABS));
/* Store the value into the zeropage instead of pushing it */
X = NewCodeEntry (OP65_STX, AM65_ZP, ZPHi, 0, PushEntry->LI);
CS_InsertEntry (S, X, Push+1);
++Xor; /* Correct the index */
if (DirectXor) {
X = NewCodeEntry (OP65_STA, AM65_ZP, ZPLo, 0, PushEntry->LI);
CS_InsertEntry (S, X, Push+1);
X = NewCodeEntry (OP65_STX, AM65_ZP, ZPHi, 0, PushEntry->LI);
CS_InsertEntry (S, X, Push+2);
++Xor; /* Correct the index */
}
/* Correct the index of the add and get a pointer to the entry */
Xor += 2;
/* Get a pointer to the entry */
XorEntry = CS_GetEntry (S, Xor);
/* Inline the or */
/* Inline the xor */
if (DirectXor) {
/* Xor with variable location */
X = NewCodeEntry (OP65_EOR, P->AM, P->Arg, 0, XorEntry->LI);
} else {
/* Xor with temp storage */
X = NewCodeEntry (OP65_EOR, AM65_ZP, ZPLo, 0, XorEntry->LI);
}
CS_InsertEntry (S, X, Xor+1);
if (PushEntry->RI->In.RegX >= 0 && XorEntry->RI->In.RegX >= 0) {
/* Both values known, precalculate the result */