6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2024-06-02 04:41:35 +00:00
Code Issues Projects Releases Wiki Activity

Added more size optimizations, separate module

Browse Source 
git-svn-id: svn://svn.cc65.org/cc65/trunk@1453 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2002-10-08 20:56:00 +00:00
parent 9ca21c07e0
commit e68b8160ed
8 changed files with 468 additions and 251 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/cc65/codeent.c
View File

@ -1229,7 +1229,7 @@ void CE_Output (const CodeEntry* E, FILE* F)
char Use [128];
char Chg [128];
fprintf (F,
"%*s; USE: %-20s CHG: %-20s SIZE: %u\n",
"%*s; USE: %-12s CHG: %-12s SIZE: %u\n",
30-Chars, "",
RegInfoDesc (E->Use, Use),
RegInfoDesc (E->Chg, Chg),

19
src/cc65/codeinfo.c
View File

@ -72,6 +72,8 @@ struct FuncInfo {
};
static const FuncInfo FuncInfoTable[] = {
{ "addeq0sp", REG_AX, REG_AXY },
{ "addeqysp", REG_AXY, REG_AXY },
{ "addysp", REG_Y, REG_NONE },
{ "aslax1", REG_AX, REG_AX | REG_TMP1 },
{ "aslax2", REG_AX, REG_AX | REG_TMP1 },
@ -124,7 +126,7 @@ static const FuncInfo FuncInfoTable[] = {
{ "laddeqa", REG_AY | REG_PTR1_LO, REG_EAXY | REG_PTR1_HI },
{ "ldaidx", REG_AXY, REG_AX | REG_PTR1 },
{ "ldauidx", REG_AXY, REG_AX | REG_PTR1 },
{ "ldax0sp", REG_Y, REG_AX },
{ "ldax0sp", REG_NONE, REG_AXY },
{ "ldaxi", REG_AX, REG_AXY | REG_PTR1 },
{ "ldaxidx", REG_AXY, REG_AXY | REG_PTR1 },
{ "ldaxysp", REG_Y, REG_AXY },
@ -135,9 +137,20 @@ static const FuncInfo FuncInfoTable[] = {
{ "lsubeqa", REG_AY | REG_PTR1_LO, REG_EAXY | REG_PTR1_HI },
{ "lsubeqysp", REG_EAXY, REG_EAXY },
{ "negax", REG_AX, REG_AX },
{ "push0", REG_NONE, REG_AXY },
{ "push1", REG_NONE, REG_AXY },
{ "push2", REG_NONE, REG_AXY },
{ "push3", REG_NONE, REG_AXY },
{ "push4", REG_NONE, REG_AXY },
{ "push5", REG_NONE, REG_AXY },
{ "push6", REG_NONE, REG_AXY },
{ "push7", REG_NONE, REG_AXY },
{ "pusha", REG_A, REG_Y },
{ "pusha0", REG_A, REG_XY },
{ "pushax", REG_AX, REG_Y },
{ "pushc0", REG_NONE, REG_A | REG_Y },
{ "pushc1", REG_NONE, REG_A | REG_Y },
{ "pushc2", REG_NONE, REG_A | REG_Y },
{ "pusheax", REG_EAX, REG_Y },
{ "pushw0sp", REG_NONE, REG_AXY },
{ "pushwysp", REG_Y, REG_AXY },
@ -158,16 +171,15 @@ static const FuncInfo FuncInfoTable[] = {
{ "staxysp", REG_AXY, REG_Y },
{ "subeq0sp", REG_AX, REG_AXY },
{ "subeqysp", REG_AXY, REG_AXY },
{ "tsteax", REG_EAX, REG_Y },
{ "tosadda0", REG_A, REG_AXY },
{ "tosaddax", REG_AX, REG_AXY },
{ "tosicmp", REG_AX, REG_AXY | REG_SREG },
{ "tosdiva0", REG_AX, REG_ALL },
{ "tosdivax", REG_AX, REG_ALL },
{ "tosdiveax", REG_EAX, REG_ALL },
{ "toseqeax", REG_EAX, REG_AXY | REG_PTR1 },
{ "tosgeeax", REG_EAX, REG_AXY | REG_PTR1 },
{ "tosgteax", REG_EAX, REG_AXY | REG_PTR1 },
{ "tosicmp", REG_AX, REG_AXY | REG_SREG },
{ "toslcmp", REG_EAX, REG_A | REG_Y | REG_PTR1 },
{ "tosleeax", REG_EAX, REG_AXY | REG_PTR1 },
{ "toslteax", REG_EAX, REG_AXY | REG_PTR1 },
@ -186,6 +198,7 @@ static const FuncInfo FuncInfoTable[] = {
{ "tosumula0", REG_AX, REG_ALL },
{ "tosumulax", REG_AX, REG_ALL },
{ "tosumuleax", REG_EAX, REG_ALL },
{ "tsteax", REG_EAX, REG_Y },
{ "utsteax", REG_EAX, REG_Y },
};
#define FuncInfoCount (sizeof(FuncInfoTable) / sizeof(FuncInfoTable[0]))

272
src/cc65/codeopt.c
View File

@ -53,6 +53,7 @@
#include "coptind.h"
#include "coptneg.h"
#include "coptpush.h"
#include "coptsize.h"
#include "coptstop.h"
#include "coptsub.h"
#include "copttest.h"
@ -1277,238 +1278,7 @@ static unsigned OptDecouple (CodeSeg* S)
/* Insert the replacement if we have one */
if (X) {
CS_InsertEntry (S, X, I+1);
CS_DelEntry (S, I);
++Changes;
}
/* Next entry */
++I;
}
/* Free register info */
CS_FreeRegInfo (S);
/* Return the number of changes made */
return Changes;
}
/*****************************************************************************/
/* Size optimization */
/*****************************************************************************/
#if 0
static unsigned OptSize1 (CodeSeg* S)
/* Do size optimization by calling special subroutines that preload registers.
* This routine does not work standalone, it needs a following register load
* removal pass.
*/
{
typedef struct CallDesc CallDesc;
struct CallDesc {
const char* LongFunc; /* Long function name */
short A, X, Y; /* Register contents */
const char* ShortFunc; /* Short function name */
};
static const CallDesc CallTable [] = {
{ "staxysp", -1, -1, 0, "stax0sp" },
{ "addeqysp", -1, -1, 0, "addeq0sp" },
{ "ldaxysp", -1, -1, 1, "ldax0sp" },
{ "ldeaxysp", -1, -1, 3, "ldeax0sp" },
{ "pushax", 0, 0, -1, "push0" },
{ "pushax", -1, 0, -1, "pusha0" },
{ "pushax", -1, 0xFF, -1, "pushaFF" },
{ "pushaysp", -1, -1, 0, "pusha0sp" },
{ "tosaddax", -1, 0, -1, "tosadda0" },
{ "tosandax", -1, 0, -1, "tosanda0" },
{ "tosdivax", -1, 0, -1, "tosdiva0" },
{ "toseqax", -1, 0, -1, "toseqa0" },
{ "tosgeax", -1, 0, -1, "tosgea0" },
{ "tosgtax", -1, 0, -1, "tosgta0" },
{ "laddeqysp", -1, -1, 0, "laddeq0sp" },
{ "ldaxidx", -1, -1, 1, "ldaxi" },
{ "ldeaxidx", -1, -1, 3, "ldeaxi" },
{ "ldeaxysp", -1, -1, 3, "ldeax0sp" },
{ "tosleax", -1, 0, -1, "toslea0" },
{ "lsubeqysp", -1, -1, 0, "lsubeq0sp" },
"toslta0", /* tosltax, x = 0 */
"tosmoda0", /* tosmodax, x = 0 */
"tosmula0", /* tosmulax, x = 0 */
"tosumula0", /* tosumulax, x = 0 */
"tosnea0", /* tosneax, x = 0 */
"tosora0", /* tosorax, x = 0 */
"push1", /* pushax, x = 0, a = 1 */
"push2", /* pushax, x = 0, a = 2 */
"push3", /* pushax, x = 0, a = 3 */
"push4", /* pushax, x = 0, a = 4 */
"push5", /* pushax, x = 0, a = 5 */
"push6", /* pushax, x = 0, a = 6 */
"push7", /* pushax, x = 0, a = 7 */
"pushc0", /* pusha, a = 0 */
"pushc1", /* pusha, a = 1 */
"pushc2", /* pusha, a = 2 */
"tosrsuba0", /* tosrsubax, x = 0 */
"tosshla0", /* tosshlax, x = 0 */
"tosasla0", /* tosaslax, x = 0 */
"tosshra0", /* tosshrax, x = 0 */
"tosasra0", /* tosasrax, x = 0 */
"steax0sp", /* steaxsp, y = 0 */
"tossuba0", /* tossubax, x = 0 */
"subeq0sp", /* subeqysp, y = 0 */
"tosudiva0", /* tosudivax, x = 0 */
"tosugea0", /* tosugeax, x = 0 */
"tosugta0", /* tosugtax, x = 0 */
"tosulea0", /* tosuleax, x = 0 */
"tosulta0", /* tosultax, x = 0 */
"tosumoda0", /* tosumodax, x = 0 */
"tosxora0", /* tosxorax, x = 0 */
"tosadd0ax", /* tosaddeax, sreg = 0 */
"laddeqa", /* laddeq, sreg = 0, x = 0 */
"laddeq1", /* laddeq, sreg = 0, x = 0, a = 1 */
"tosand0ax", /* tosandeax, sreg = 0 */
"tosdiv0ax", /* tosdiveax, sreg = 0 */
"tosmod0ax", /* tosmodeax, sreg = 0 */
"tosmul0ax", /* tosmuleax, sreg = 0 */
"tosumul0ax", /* tosumuleax, sreg = 0 */
"tosor0ax", /* tosoreax, sreg = 0 */
"push0ax", /* pusheax, sreg = 0 */
"tosrsub0ax", /* tosrsubeax, sreg = 0 */
"tosshl0ax", /* tosshleax, sreg = 0 */
"tosasl0ax", /* tosasleax, sreg = 0 */
"tosshr0ax", /* tosshreax, sreg = 0 */
"tosasr0ax", /* tosasreax, sreg = 0 */
"tossub0ax", /* tossubeax, sreg = 0 */
"lsubeqa", /* lsubeq, sreg = 0, x = 0 */
"lsubeq1", /* lsubeq, sreg = 0, x = 0, a = 1 */
"tosudiv0ax", /* tosudiveax, sreg = 0 */
"tosumod0ax", /* tosumodeax, sreg = 0 */
"tosxor0ax", /* tosxoreax, sreg = 0 */
};
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)) {
/* Get next entry */
CodeEntry* E = CS_GetEntry (S, I);
/* Check if it's a subroutine call */
if (E->OPC == OP65_JSR) {
/* Check for any of the known functions */
}
/* Next entry */
++I;
}
/* Free register info */
CS_FreeRegInfo (S);
/* Return the number of changes made */
return Changes;
}
#endif
static unsigned OptSize2 (CodeSeg* S)
/* Do size optimization by using shorter code sequences, even if this
* introduces relations between instructions. This step must be one of the
* last steps, because it makes further work much more difficult.
*/
{
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)) {
/* Get next entry */
CodeEntry* E = CS_GetEntry (S, I);
/* Assume we have no replacement */
CodeEntry* X = 0;
/* Check the instruction */
switch (E->OPC) {
case OP65_LDA:
if (CE_KnownImm (E)) {
short Val = (short) E->Num;
if (Val == E->RI->In.RegX) {
X = NewCodeEntry (OP65_TXA, AM65_IMP, 0, 0, E->LI);
} else if (Val == E->RI->In.RegY) {
X = NewCodeEntry (OP65_TYA, AM65_IMP, 0, 0, E->LI);
} else if (E->RI->In.RegA >= 0 && CPU >= CPU_65C02) {
if (Val == ((E->RI->In.RegA - 1) & 0xFF)) {
X = NewCodeEntry (OP65_DEA, AM65_IMP, 0, 0, E->LI);
} else if (Val == ((E->RI->In.RegA + 1) & 0xFF)) {
X = NewCodeEntry (OP65_INA, AM65_IMP, 0, 0, E->LI);
}
}
}
break;
case OP65_LDX:
if (CE_KnownImm (E)) {
short Val = (short) E->Num;
if (E->RI->In.RegX >= 0 && Val == ((E->RI->In.RegX - 1) & 0xFF)) {
X = NewCodeEntry (OP65_DEX, AM65_IMP, 0, 0, E->LI);
} else if (E->RI->In.RegX >= 0 && Val == ((E->RI->In.RegX + 1) & 0xFF)) {
X = NewCodeEntry (OP65_INX, AM65_IMP, 0, 0, E->LI);
} else if (Val == E->RI->In.RegA) {
X = NewCodeEntry (OP65_TAX, AM65_IMP, 0, 0, E->LI);
}
}
break;
case OP65_LDY:
if (CE_KnownImm (E)) {
short Val = (short) E->Num;
if (E->RI->In.RegY >= 0 && Val == ((E->RI->In.RegY - 1) & 0xFF)) {
X = NewCodeEntry (OP65_DEY, AM65_IMP, 0, 0, E->LI);
} else if (E->RI->In.RegY >= 0 && Val == ((E->RI->In.RegY + 1) & 0xFF)) {
X = NewCodeEntry (OP65_INY, AM65_IMP, 0, 0, E->LI);
} else if (Val == E->RI->In.RegA) {
X = NewCodeEntry (OP65_TAY, AM65_IMP, 0, 0, E->LI);
}
}
break;
default:
/* Avoid gcc warnings */
break;
}
/* Insert the replacement if we have one */
if (X) {
CS_InsertEntry (S, X, I+1);
CS_InsertEntry (S, X, I+1);
CS_DelEntry (S, I);
++Changes;
}
@ -1598,7 +1368,7 @@ static OptFunc DOptPushPop = { OptPushPop, "OptPushPop", 0, 0,
static OptFunc DOptShift1 = { OptShift1, "OptShift1", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptShift2 = { OptShift2, "OptShift2", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptShift3 = { OptShift3, "OptShift3", 110, 0, 0, 0, 0, 0 };
/*static OptFunc DOptSize1 = { OptSize1, "OptSize1", 100, 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 DOptStoreLoad = { OptStoreLoad, "OptStoreLoad", 0, 0, 0, 0, 0, 0 };
@ -1656,7 +1426,7 @@ static OptFunc* OptFuncs[] = {
&DOptShift1,
&DOptShift2,
&DOptShift3,
/*&DOptSize1,*/
&DOptSize1,
&DOptSize2,
&DOptStackOps,
&DOptStoreLoad,
@ -2037,16 +1807,30 @@ static unsigned RunOptGroup6 (CodeSeg* S)
unsigned Changes = 0;
unsigned C;
/* Optimize for size, that is replace operations by shorter ones, even
* if this does hinder further optimizations (no problem since we're
* done soon).
*/
Changes += RunOptFunc (S, &DOptSize2, 1);
/* Run the jump target optimization again, since the size optimization
* above may have opened new oportunities.
*/
Changes += RunOptFunc (S, &DOptJumpTarget, 5);
if (CodeSizeFactor <= 100) {
/* Optimize for size, that is replace operations by shorter ones, even
* if this does hinder further optimizations (no problem since we're
* done soon).
*/
C = RunOptFunc (S, &DOptSize1, 1);
if (C) {
Changes += C;
/* Run some optimization passes again, since the size optimizations
* may have opened new oportunities.
*/
Changes += RunOptFunc (S, &DOptUnusedLoads, 1);
Changes += RunOptFunc (S, &DOptJumpTarget, 5);
}
}
C = RunOptFunc (S, &DOptSize2, 1);
if (C) {
Changes += C;
/* Run some optimization passes again, since the size optimizations
* may have opened new oportunities.
*/
Changes += RunOptFunc (S, &DOptUnusedLoads, 1);
Changes += RunOptFunc (S, &DOptJumpTarget, 5);
}
/* Adjust branch distances */
Changes += RunOptFunc (S, &DOptBranchDist, 3);

349
src/cc65/coptsize.c Normal file
View File

@ -0,0 +1,349 @@
/*****************************************************************************/
/* */
/* coptsize.c */
/* */
/* Size optimizations */
/* */
/* */
/* */
/* (C) 2002 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#include <stdlib.h>
/* cc65 */
#include "codeent.h"
#include "codeinfo.h"
#include "cpu.h"
#include "coptsize.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
typedef struct CallDesc CallDesc;
struct CallDesc {
const char* LongFunc; /* Long function name */
short A, X, Y; /* Register contents */
const char* ShortFunc; /* Short function name */
};
/* Note: The table is sorted. If there is more than one entry with the same
* name, entries are sorted best match first, so when searching linear for
* a match, the first one can be used because it is also the best one (or
* at least none of the following ones are better).
*/
static const CallDesc CallTable [] = {
{ "addeqysp", -1, -1, 0, "addeq0sp" },
{ "laddeqysp", -1, -1, 0, "laddeq0sp" },
{ "ldaxysp", -1, -1, 1, "ldax0sp" },
{ "ldeaxidx", -1, -1, 3, "ldeaxi" },
{ "ldeaxysp", -1, -1, 3, "ldeax0sp" },
{ "pusha", 0, -1, -1, "pushc0" },
{ "pusha", 1, -1, -1, "pushc1" },
{ "pusha", 2, -1, -1, "pushc2" },
{ "pushax", 0, 0, -1, "push0" },
{ "pushax", 1, 0, -1, "push1" },
{ "pushax", 2, 0, -1, "push2" },
{ "pushax", 3, 0, -1, "push3" },
{ "pushax", 4, 0, -1, "push4" },
{ "pushax", 5, 0, -1, "push5" },
{ "pushax", 6, 0, -1, "push6" },
{ "pushax", 7, 0, -1, "push7" },
{ "pushax", -1, 0, -1, "pusha0" },
{ "pushax", -1, 0xFF, -1, "pushaFF" },
{ "pushaysp", -1, -1, 0, "pusha0sp" },
{ "staxysp", -1, -1, 0, "stax0sp" },
{ "tosaddax", -1, 0, -1, "tosadda0" },
{ "tosandax", -1, 0, -1, "tosanda0" },
{ "tosdivax", -1, 0, -1, "tosdiva0" },
{ "toseqax", -1, 0, -1, "toseqa0" },
{ "tosgeax", -1, 0, -1, "tosgea0" },
{ "tosgtax", -1, 0, -1, "tosgta0" },
{ "tosleax", -1, 0, -1, "toslea0" },
{ "tosorax", -1, 0, -1, "tosora0" },
{ "ldaxidx", -1, -1, 1, "ldaxi" },
{ "ldeaxysp", -1, -1, 3, "ldeax0sp" },
{ "lsubeqysp", -1, -1, 0, "lsubeq0sp" },
{ "steaxysp", -1, -1, 0, "steax0sp" },
{ "subeqysp", -1, -1, 0, "subeq0sp" },
{ "tosaslax", -1, 0, -1, "tosasla0" },
{ "tosasrax", -1, 0, -1, "tosasra0" },
{ "tosltax", -1, 0, -1, "toslta0" },
{ "tosmodax", -1, 0, -1, "tosmoda0" },
{ "tosmulax", -1, 0, -1, "tosmula0" },
{ "tosneax", -1, 0, -1, "tosnea0" },
{ "tosrsubax", -1, 0, -1, "tosrsuba0" },
{ "tosshlax", -1, 0, -1, "tosshla0" },
{ "tosshrax", -1, 0, -1, "tosshra0" },
{ "tossubax", -1, 0, -1, "tossuba0" },
{ "tosudivax", -1, 0, -1, "tosudiva0" },
{ "tosugeax", -1, 0, -1, "tosugea0" },
{ "tosugtax", -1, 0, -1, "tosugta0" },
{ "tosuleax", -1, 0, -1, "tosulea0" },
{ "tosultax", -1, 0, -1, "tosulta0" },
{ "tosumodax", -1, 0, -1, "tosumoda0" },
{ "tosumulax", -1, 0, -1, "tosumula0" },
{ "tosxorax", -1, 0, -1, "tosxora0" },
{ "zzzzzzzz", -1, -1, -1, "zzzzzzzz" },
#if 0
"tosadd0ax", /* tosaddeax, sreg = 0 */
"laddeqa", /* laddeq, sreg = 0, x = 0 */
"laddeq1", /* laddeq, sreg = 0, x = 0, a = 1 */
"tosand0ax", /* tosandeax, sreg = 0 */
"tosdiv0ax", /* tosdiveax, sreg = 0 */
"tosmod0ax", /* tosmodeax, sreg = 0 */
"tosmul0ax", /* tosmuleax, sreg = 0 */
"tosumul0ax", /* tosumuleax, sreg = 0 */
"tosor0ax", /* tosoreax, sreg = 0 */
"push0ax", /* pusheax, sreg = 0 */
"tosrsub0ax", /* tosrsubeax, sreg = 0 */
"tosshl0ax", /* tosshleax, sreg = 0 */
"tosasl0ax", /* tosasleax, sreg = 0 */
"tosshr0ax", /* tosshreax, sreg = 0 */
"tosasr0ax", /* tosasreax, sreg = 0 */
"tossub0ax", /* tossubeax, sreg = 0 */
"lsubeqa", /* lsubeq, sreg = 0, x = 0 */
"lsubeq1", /* lsubeq, sreg = 0, x = 0, a = 1 */
"tosudiv0ax", /* tosudiveax, sreg = 0 */
"tosumod0ax", /* tosumodeax, sreg = 0 */
"tosxor0ax", /* tosxoreax, sreg = 0 */
#endif
};
#define CALL_COUNT (sizeof(CallTable) / sizeof(CallTable[0]))
/*****************************************************************************/
/* Helpers */
/*****************************************************************************/
static const CallDesc* FindCall (const char* Name)
/* Find the function with the given name. Return a pointer to the table entry
* or NULL if the function was not found.
*/
{
/* Do a binary search */
int First = 0;
int Last = (sizeof(CallTable) / sizeof(CallTable[0])) - 1;
int Current;
int Result;
int Found = 0;
while (First <= Last) {
/* Set current to mid of range */
Current = (Last + First) / 2;
/* Do a compare */
Result = strcmp (CallTable[Current].LongFunc, Name);
if (Result < 0) {
First = Current + 1;
} else {
Last = Current - 1;
if (Result == 0) {
/* Found. Repeat the procedure until the first of all entries
* with the same name is found.
*/
Found = 1;
}
}
}
/* Return the first entry if found, or NULL otherwise */
return Found? &CallTable[First] : 0;
}
/*****************************************************************************/
/* Code */
/*****************************************************************************/
unsigned OptSize1 (CodeSeg* S)
/* Do size optimization by calling special subroutines that preload registers.
* This routine does not work standalone, it needs a following register load
* removal pass.
*/
{
CodeEntry* E;
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)) {
/* Get next entry */
E = CS_GetEntry (S, I);
/* Check if it's a subroutine call */
if (E->OPC == OP65_JSR) {
/* Check for any of the known functions. */
const CallDesc* D = FindCall (E->Arg);
while (D && strcmp (D->LongFunc, E->Arg) == 0) {
/* Check the registers */
if ((D->A < 0 || D->A == E->RI->In.RegA) &&
(D->X < 0 || D->X == E->RI->In.RegX) &&
(D->Y < 0 || D->Y == E->RI->In.RegY)) {
/* Ok, match for all registers */
CodeEntry* X;
X = NewCodeEntry (E->OPC, E->AM, D->ShortFunc, 0, E->LI);
CS_InsertEntry (S, X, I+1);
CS_DelEntry (S, I);
/* Remember that we had changes */
++Changes;
}
++D;
}
}
/* Next entry */
++I;
}
/* Free register info */
CS_FreeRegInfo (S);
/* Return the number of changes made */
return Changes;
}
unsigned OptSize2 (CodeSeg* S)
/* Do size optimization by using shorter code sequences, even if this
* introduces relations between instructions. This step must be one of the
* last steps, because it makes further work much more difficult.
*/
{
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)) {
/* Get next entry */
CodeEntry* E = CS_GetEntry (S, I);
/* Assume we have no replacement */
CodeEntry* X = 0;
/* Check the instruction */
switch (E->OPC) {
case OP65_LDA:
if (CE_KnownImm (E)) {
short Val = (short) E->Num;
if (Val == E->RI->In.RegX) {
X = NewCodeEntry (OP65_TXA, AM65_IMP, 0, 0, E->LI);
} else if (Val == E->RI->In.RegY) {
X = NewCodeEntry (OP65_TYA, AM65_IMP, 0, 0, E->LI);
} else if (E->RI->In.RegA >= 0 && CPU >= CPU_65C02) {
if (Val == ((E->RI->In.RegA - 1) & 0xFF)) {
X = NewCodeEntry (OP65_DEA, AM65_IMP, 0, 0, E->LI);
} else if (Val == ((E->RI->In.RegA + 1) & 0xFF)) {
X = NewCodeEntry (OP65_INA, AM65_IMP, 0, 0, E->LI);
}
}
}
break;
case OP65_LDX:
if (CE_KnownImm (E)) {
short Val = (short) E->Num;
if (E->RI->In.RegX >= 0 && Val == ((E->RI->In.RegX - 1) & 0xFF)) {
X = NewCodeEntry (OP65_DEX, AM65_IMP, 0, 0, E->LI);
} else if (E->RI->In.RegX >= 0 && Val == ((E->RI->In.RegX + 1) & 0xFF)) {
X = NewCodeEntry (OP65_INX, AM65_IMP, 0, 0, E->LI);
} else if (Val == E->RI->In.RegA) {
X = NewCodeEntry (OP65_TAX, AM65_IMP, 0, 0, E->LI);
}
}
break;
case OP65_LDY:
if (CE_KnownImm (E)) {
short Val = (short) E->Num;
if (E->RI->In.RegY >= 0 && Val == ((E->RI->In.RegY - 1) & 0xFF)) {
X = NewCodeEntry (OP65_DEY, AM65_IMP, 0, 0, E->LI);
} else if (E->RI->In.RegY >= 0 && Val == ((E->RI->In.RegY + 1) & 0xFF)) {
X = NewCodeEntry (OP65_INY, AM65_IMP, 0, 0, E->LI);
} else if (Val == E->RI->In.RegA) {
X = NewCodeEntry (OP65_TAY, AM65_IMP, 0, 0, E->LI);
}
}
break;
default:
/* Avoid gcc warnings */
break;
}
/* Insert the replacement if we have one */
if (X) {
CS_InsertEntry (S, X, I+1);
CS_DelEntry (S, I);
++Changes;
}
/* Next entry */
++I;
}
/* Free register info */
CS_FreeRegInfo (S);
/* Return the number of changes made */
return Changes;
}

70
src/cc65/coptsize.h Normal file
View File

@ -0,0 +1,70 @@
/*****************************************************************************/
/* */
/* coptsize.c */
/* */
/* Size optimizations */
/* */
/* */
/* */
/* (C) 2002 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#ifndef COPTSIZE_H
#define COPTSIZE_H
/* cc65 */
#include "codeseg.h"
/*****************************************************************************/
/* Code */
/*****************************************************************************/
unsigned OptSize1 (CodeSeg* S);
/* Do size optimization by calling special subroutines that preload registers.
* This routine does not work standalone, it needs a following register load
* removal pass.
*/
unsigned OptSize2 (CodeSeg* S);
/* Do size optimization by using shorter code sequences, even if this
* introduces relations between instructions. This step must be one of the
* last steps, because it makes further work much more difficult.
*/
/* End of coptsize.h */
#endif

2
src/cc65/coptstop.c
View File

@ -38,8 +38,6 @@
/* cc65 */
#include "codeent.h"
#include "codeinfo.h"
#include "codeopt.h"
#include "error.h"
#include "coptstop.h"

1
src/cc65/make/gcc.mak
View File

@ -40,6 +40,7 @@ OBJS = anonname.o \
coptind.o \
coptneg.o \
coptpush.o \
coptsize.o \
coptstop.o \
coptsub.o \
copttest.o \

4
src/cc65/make/watcom.mak
View File

@ -85,6 +85,7 @@ OBJS = anonname.obj \
coptind.obj \
coptneg.obj \
coptpush.obj \
coptsize.obj \
coptstop.obj \
coptsub.obj \
copttest.obj \
@ -166,6 +167,7 @@ FILE coptcmp.obj
FILE coptind.obj
FILE coptneg.obj
FILE coptpush.obj
FILE coptsize.obj
FILE coptstop.obj
FILE coptsub.obj
FILE copttest.obj
@ -181,7 +183,7 @@ FILE exprnode.obj
FILE funcdesc.obj
FILE function.obj
FILE global.obj
FILE goto.obj
FILE goto.obj
FILE hexval.obj
FILE ident.obj
FILE incpath.obj