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cc65/src/cc65/codeopt.c

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/*****************************************************************************/
/* */
/* codeopt.c */
/* */
/* Optimizer subroutines */
/* */
/* */
/* */
/* (C) 2001-2012, Ullrich von Bassewitz */
/* Roemerstrasse 52 */
/* D-70794 Filderstadt */
/* 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>
#include <string.h>
#include <stdarg.h>
/* common */
#include "abend.h"
#include "chartype.h"
#include "cpu.h"
#include "debugflag.h"
#include "print.h"
#include "strbuf.h"
#include "xmalloc.h"
#include "xsprintf.h"
/* cc65 */
#include "codeent.h"
#include "codeinfo.h"
#include "codeopt.h"
#include "coptadd.h"
#include "coptbool.h"
#include "coptc02.h"
#include "coptcmp.h"
#include "coptind.h"
#include "coptjmp.h"
#include "coptlong.h"
#include "coptmisc.h"
#include "coptptrload.h"
#include "coptptrstore.h"
#include "coptpush.h"
#include "coptshift.h"
#include "coptsize.h"
#include "coptstop.h"
#include "coptstore.h"
#include "coptsub.h"
#include "copttest.h"
#include "coptunary.h"
#include "error.h"
#include "global.h"
#include "output.h"
/*****************************************************************************/
/* struct OptFunc */
/*****************************************************************************/
typedef struct OptFunc OptFunc;
struct OptFunc {
unsigned (*Func) (CodeSeg*); /* Optimizer function */
const char* Name; /* Name of the function/group */
unsigned CodeSizeFactor; /* Code size factor for this opt func */
unsigned long TotalRuns; /* Total number of runs */
unsigned long LastRuns; /* Last number of runs */
unsigned long TotalChanges; /* Total number of changes */
unsigned long LastChanges; /* Last number of changes */
char Disabled; /* True if function disabled */
};
/*****************************************************************************/
/* Code */
/*****************************************************************************/
/* A list of all the function descriptions */
static OptFunc DOpt65C02BitOps = { Opt65C02BitOps, "Opt65C02BitOps", 66, 0, 0, 0, 0, 0 };
static OptFunc DOpt65C02Ind = { Opt65C02Ind, "Opt65C02Ind", 100, 0, 0, 0, 0, 0 };
static OptFunc DOpt65C02Stores = { Opt65C02Stores, "Opt65C02Stores", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptAdd1 = { OptAdd1, "OptAdd1", 125, 0, 0, 0, 0, 0 };
static OptFunc DOptAdd2 = { OptAdd2, "OptAdd2", 200, 0, 0, 0, 0, 0 };
static OptFunc DOptAdd3 = { OptAdd3, "OptAdd3", 65, 0, 0, 0, 0, 0 };
static OptFunc DOptAdd4 = { OptAdd4, "OptAdd4", 90, 0, 0, 0, 0, 0 };
static OptFunc DOptAdd5 = { OptAdd5, "OptAdd5", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptAdd6 = { OptAdd6, "OptAdd6", 40, 0, 0, 0, 0, 0 };
static OptFunc DOptBNegA1 = { OptBNegA1, "OptBNegA1", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptBNegA2 = { OptBNegA2, "OptBNegA2", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptBNegAX1 = { OptBNegAX1, "OptBNegAX1", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptBNegAX2 = { OptBNegAX2, "OptBNegAX2", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptBNegAX3 = { OptBNegAX3, "OptBNegAX3", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptBNegAX4 = { OptBNegAX4, "OptBNegAX4", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptBoolCmp = { OptBoolCmp, "OptBoolCmp", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptBoolTrans = { OptBoolTrans, "OptBoolTrans", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptBoolUnary1 = { OptBoolUnary1, "OptBoolUnary1", 40, 0, 0, 0, 0, 0 };
static OptFunc DOptBoolUnary2 = { OptBoolUnary2, "OptBoolUnary2", 40, 0, 0, 0, 0, 0 };
static OptFunc DOptBoolUnary3 = { OptBoolUnary3, "OptBoolUnary3", 40, 0, 0, 0, 0, 0 };
static OptFunc DOptBranchDist = { OptBranchDist, "OptBranchDist", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptBranchDist2 = { OptBranchDist2, "OptBranchDist2", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptCmp1 = { OptCmp1, "OptCmp1", 42, 0, 0, 0, 0, 0 };
static OptFunc DOptCmp2 = { OptCmp2, "OptCmp2", 85, 0, 0, 0, 0, 0 };
static OptFunc DOptCmp3 = { OptCmp3, "OptCmp3", 75, 0, 0, 0, 0, 0 };
static OptFunc DOptCmp4 = { OptCmp4, "OptCmp4", 75, 0, 0, 0, 0, 0 };
static OptFunc DOptCmp5 = { OptCmp5, "OptCmp5", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptCmp7 = { OptCmp7, "OptCmp7", 85, 0, 0, 0, 0, 0 };
static OptFunc DOptCmp8 = { OptCmp8, "OptCmp8", 50, 0, 0, 0, 0, 0 };
static OptFunc DOptCmp9 = { OptCmp9, "OptCmp9", 85, 0, 0, 0, 0, 0 };
static OptFunc DOptComplAX1 = { OptComplAX1, "OptComplAX1", 65, 0, 0, 0, 0, 0 };
static OptFunc DOptCondBranch1 = { OptCondBranch1, "OptCondBranch1", 80, 0, 0, 0, 0, 0 };
static OptFunc DOptCondBranch2 = { OptCondBranch2, "OptCondBranch2", 40, 0, 0, 0, 0, 0 };
static OptFunc DOptCondBranch3 = { OptCondBranch3, "OptCondBranch3", 40, 0, 0, 0, 0, 0 };
static OptFunc DOptCondBranchC = { OptCondBranchC, "OptCondBranchC", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptDeadCode = { OptDeadCode, "OptDeadCode", 100, 0, 0, 0, 0, 0 };
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 DOptGotoSPAdj = { OptGotoSPAdj, "OptGotoSPAdj", 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 DOptLoad3 = { OptLoad3, "OptLoad3", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptLongAssign = { OptLongAssign, "OptLongAssign", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptLongCopy = { OptLongCopy, "OptLongCopy", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptNegAX1 = { OptNegAX1, "OptNegAX1", 165, 0, 0, 0, 0, 0 };
static OptFunc DOptNegAX2 = { OptNegAX2, "OptNegAX2", 200, 0, 0, 0, 0, 0 };
static OptFunc DOptPrecalc = { OptPrecalc, "OptPrecalc", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad1 = { OptPtrLoad1, "OptPtrLoad1", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad2 = { OptPtrLoad2, "OptPtrLoad2", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad3 = { OptPtrLoad3, "OptPtrLoad3", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad4 = { OptPtrLoad4, "OptPtrLoad4", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad5 = { OptPtrLoad5, "OptPtrLoad5", 50, 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 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 DOptPtrLoad18 = { OptPtrLoad18, "OptPtrLoad18", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad19 = { OptPtrLoad19, "OptPtrLoad19", 65, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrStore1 = { OptPtrStore1, "OptPtrStore1", 65, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrStore2 = { OptPtrStore2, "OptPtrStore2", 65, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrStore3 = { OptPtrStore3, "OptPtrStore3", 100, 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 DOptPushPop1 = { OptPushPop1, "OptPushPop1", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptPushPop2 = { OptPushPop2, "OptPushPop2", 0, 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 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", 17, 0, 0, 0, 0, 0 };
static OptFunc DOptShift4 = { OptShift4, "OptShift4", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptShift5 = { OptShift5, "OptShift5", 110, 0, 0, 0, 0, 0 };
static OptFunc DOptShift6 = { OptShift6, "OptShift6", 200, 0, 0, 0, 0, 0 };
static OptFunc DOptShiftBack = { OptShiftBack, "OptShiftBack", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptSignExtended = { OptSignExtended, "OptSignExtended", 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", 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 DOptStoreLoad = { OptStoreLoad, "OptStoreLoad", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptLoadStoreLoad= { OptLoadStoreLoad,"OptLoadStoreLoad", 0, 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", 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 };
static OptFunc DOptTransfers4 = { OptTransfers4, "OptTransfers4", 65, 0, 0, 0, 0, 0 };
static OptFunc DOptUnusedLoads = { OptUnusedLoads, "OptUnusedLoads", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptUnusedStores = { OptUnusedStores, "OptUnusedStores", 0, 0, 0, 0, 0, 0 };
/* Table containing all the steps in alphabetical order */
static OptFunc* OptFuncs[] = {
&DOpt65C02BitOps,
&DOpt65C02Ind,
&DOpt65C02Stores,
&DOptAdd1,
&DOptAdd2,
&DOptAdd3,
&DOptAdd4,
&DOptAdd5,
&DOptAdd6,
&DOptBNegA1,
&DOptBNegA2,
&DOptBNegAX1,
&DOptBNegAX2,
&DOptBNegAX3,
&DOptBNegAX4,
&DOptBoolCmp,
&DOptBoolTrans,
&DOptBoolUnary1,
&DOptBoolUnary2,
&DOptBoolUnary3,
&DOptBranchDist,
&DOptBranchDist2,
&DOptCmp1,
&DOptCmp2,
&DOptCmp3,
&DOptCmp4,
&DOptCmp5,
&DOptCmp7,
&DOptCmp8,
&DOptCmp9,
&DOptComplAX1,
&DOptCondBranch1,
&DOptCondBranch2,
&DOptCondBranch3,
&DOptCondBranchC,
&DOptDeadCode,
&DOptDeadJumps,
&DOptDecouple,
&DOptDupLoads,
&DOptGotoSPAdj,
&DOptIndLoads1,
&DOptIndLoads2,
&DOptJumpCascades,
&DOptJumpTarget1,
&DOptJumpTarget2,
&DOptJumpTarget3,
&DOptLoad1,
&DOptLoad2,
&DOptLoad3,
&DOptLongAssign,
&DOptLongCopy,
&DOptNegAX1,
&DOptNegAX2,
&DOptPrecalc,
&DOptPtrLoad1,
&DOptPtrLoad11,
&DOptPtrLoad12,
&DOptPtrLoad13,
&DOptPtrLoad14,
&DOptPtrLoad15,
&DOptPtrLoad16,
&DOptPtrLoad17,
&DOptPtrLoad18,
&DOptPtrLoad19,
&DOptPtrLoad2,
&DOptPtrLoad3,
&DOptPtrLoad4,
&DOptPtrLoad5,
&DOptPtrLoad6,
&DOptPtrLoad7,
&DOptPtrStore1,
&DOptPtrStore2,
&DOptPtrStore3,
&DOptPush1,
&DOptPush2,
&DOptPushPop1,
&DOptRTS,
&DOptRTSJumps1,
&DOptRTSJumps2,
&DOptShift1,
&DOptShift2,
&DOptShift3,
&DOptShift4,
&DOptShift5,
&DOptShift6,
&DOptShiftBack,
&DOptSignExtended,
&DOptSize1,
&DOptSize2,
&DOptStackOps,
&DOptStackPtrOps,
&DOptStore1,
&DOptStore2,
&DOptStore3,
&DOptStore4,
&DOptStore5,
&DOptStoreLoad,
&DOptLoadStoreLoad,
&DOptSub1,
&DOptSub2,
&DOptSub3,
&DOptTest1,
&DOptTest2,
&DOptTransfers1,
&DOptTransfers2,
&DOptTransfers3,
&DOptTransfers4,
&DOptUnusedLoads,
&DOptUnusedStores,
};
#define OPTFUNC_COUNT (sizeof(OptFuncs) / sizeof(OptFuncs[0]))
static int CmpOptStep (const void* Key, const void* Func)
/* Compare function for bsearch */
{
return strcmp (Key, (*(const OptFunc**)Func)->Name);
}
static OptFunc* FindOptFunc (const char* Name)
/* Find an optimizer step by name in the table and return a pointer. Return
** NULL if no such step is found.
*/
{
/* Search for the function in the list */
OptFunc** O = bsearch (Name, OptFuncs, OPTFUNC_COUNT, sizeof (OptFuncs[0]), CmpOptStep);
return O? *O : 0;
}
static OptFunc* GetOptFunc (const char* Name)
/* Find an optimizer step by name in the table and return a pointer. Print an
** error and call AbEnd if not found.
*/
{
/* Search for the function in the list */
OptFunc* F = FindOptFunc (Name);
if (F == 0) {
/* Not found */
AbEnd ("Optimization step '%s' not found", Name);
}
return F;
}
void DisableOpt (const char* Name)
/* Disable the optimization with the given name */
{
if (strcmp (Name, "any") == 0) {
unsigned I;
for (I = 0; I < OPTFUNC_COUNT; ++I) {
OptFuncs[I]->Disabled = 1;
}
} else {
GetOptFunc(Name)->Disabled = 1;
}
}
void EnableOpt (const char* Name)
/* Enable the optimization with the given name */
{
if (strcmp (Name, "any") == 0) {
unsigned I;
for (I = 0; I < OPTFUNC_COUNT; ++I) {
OptFuncs[I]->Disabled = 0;
}
} else {
GetOptFunc(Name)->Disabled = 0;
}
}
void ListOptSteps (FILE* F)
/* List all optimization steps */
{
unsigned I;
fprintf (F, "any\n");
for (I = 0; I < OPTFUNC_COUNT; ++I) {
if (OptFuncs[I]->Func != 0) {
fprintf (F, "%s\n", OptFuncs[I]->Name);
}
}
}
static void ReadOptStats (const char* Name)
/* Read the optimizer statistics file */
{
char Buf [256];
/* Try to open the file */
FILE* F = fopen (Name, "r");
if (F == 0) {
/* Ignore the error */
return;
}
/* Read and parse the lines */
while (fgets (Buf, sizeof (Buf), F) != 0) {
char* B;
unsigned Len;
OptFunc* Func;
/* Fields */
char Name[32];
unsigned long TotalRuns;
unsigned long TotalChanges;
/* Remove trailing white space including the line terminator */
B = Buf;
Len = strlen (B);
while (Len > 0 && IsSpace (B[Len-1])) {
--Len;
}
B[Len] = '\0';
/* Remove leading whitespace */
while (IsSpace (*B)) {
++B;
}
/* Check for empty and comment lines */
if (*B == '\0' || *B == ';' || *B == '#') {
continue;
}
/* Parse the line */
if (sscanf (B, "%31s %lu %*u %lu %*u", Name, &TotalRuns, &TotalChanges) != 3) {
/* Syntax error */
continue;
}
/* Search for the optimizer step. */
Func = FindOptFunc (Name);
if (Func == 0) {
/* Not found */
continue;
}
/* Found the step, set the fields */
Func->TotalRuns = TotalRuns;
Func->TotalChanges = TotalChanges;
}
/* Close the file, ignore errors here. */
fclose (F);
}
static void WriteOptStats (const char* Name)
/* Write the optimizer statistics file */
{
unsigned I;
/* Try to open the file */
FILE* F = fopen (Name, "w");
if (F == 0) {
/* Ignore the error */
return;
}
/* Write a header */
fprintf (F,
"; Optimizer Total Last Total Last\n"
"; Step Runs Runs Chg Chg\n");
/* Write the data */
for (I = 0; I < OPTFUNC_COUNT; ++I) {
const OptFunc* O = OptFuncs[I];
fprintf (F,
"%-20s %10lu %10lu %10lu %10lu\n",
O->Name,
O->TotalRuns,
O->LastRuns,
O->TotalChanges,
O->LastChanges);
}
/* Close the file, ignore errors here. */
fclose (F);
}
static void OpenDebugFile (const CodeSeg* S)
/* Open the debug file for the given segment if the flag is on */
{
if (DebugOptOutput) {
StrBuf Name = AUTO_STRBUF_INITIALIZER;
if (S->Func) {
SB_CopyStr (&Name, S->Func->Name);
} else {
SB_CopyStr (&Name, "global");
}
SB_AppendStr (&Name, ".opt");
SB_Terminate (&Name);
OpenDebugOutputFile (SB_GetConstBuf (&Name));
SB_Done (&Name);
}
}
static void WriteDebugOutput (CodeSeg* S, const char* Step)
/* Write a separator line into the debug file if the flag is on */
{
if (DebugOptOutput) {
/* Output a separator */
WriteOutput ("=========================================================================\n");
/* Output a header line */
if (Step == 0) {
/* Initial output */
WriteOutput ("Initial code for function '%s':\n",
S->Func? S->Func->Name : "<global>");
} else {
WriteOutput ("Code after applying '%s':\n", Step);
}
/* Output the code segment */
CS_Output (S);
}
}
static unsigned RunOptFunc (CodeSeg* S, OptFunc* F, unsigned Max)
/* Run one optimizer function Max times or until there are no more changes */
{
unsigned Changes, C;
/* Don't run the function if it is removed, disabled or prohibited by the
** code size factor
*/
if (F->Func == 0 || F->Disabled || F->CodeSizeFactor > S->CodeSizeFactor) {
return 0;
}
/* Run this until there are no more changes */
Changes = 0;
do {
/* Run the function */
C = F->Func (S);
Changes += C;
/* Do statistics */
++F->TotalRuns;
++F->LastRuns;
F->TotalChanges += C;
F->LastChanges += C;
/* If we had changes, output stuff and regenerate register info */
if (C) {
if (Debug) {
printf ("Applied %s: %u changes\n", F->Name, C);
}
WriteDebugOutput (S, F->Name);
CS_GenRegInfo (S);
}
} while (--Max && C > 0);
/* Return the number of changes */
return Changes;
}
static unsigned RunOptGroup1 (CodeSeg* S)
/* Run the first group of optimization steps. These steps translate known
** patterns emitted by the code generator into more optimal patterns. Order
** of the steps is important, because some of the steps done earlier cover
** the same patterns as later steps as subpatterns.
*/
{
unsigned Changes = 0;
Changes += RunOptFunc (S, &DOptGotoSPAdj, 1);
Changes += RunOptFunc (S, &DOptStackPtrOps, 5);
Changes += RunOptFunc (S, &DOptAdd3, 1); /* Before OptPtrLoad5! */
Changes += RunOptFunc (S, &DOptPtrStore1, 1);
Changes += RunOptFunc (S, &DOptPtrStore2, 1);
Changes += RunOptFunc (S, &DOptPtrStore3, 1);
Changes += RunOptFunc (S, &DOptPtrLoad1, 1);
Changes += RunOptFunc (S, &DOptPtrLoad2, 1);
Changes += RunOptFunc (S, &DOptPtrLoad3, 1);
Changes += RunOptFunc (S, &DOptPtrLoad4, 1);
Changes += RunOptFunc (S, &DOptPtrLoad5, 1);
Changes += RunOptFunc (S, &DOptPtrLoad6, 1);
Changes += RunOptFunc (S, &DOptPtrLoad18, 1); /* Before OptPtrLoad7 */
Changes += RunOptFunc (S, &DOptPtrLoad19, 1); /* Before OptPtrLoad7 */
Changes += RunOptFunc (S, &DOptPtrLoad7, 1);
Changes += RunOptFunc (S, &DOptPtrLoad11, 1);
Changes += RunOptFunc (S, &DOptPtrLoad12, 1);
Changes += RunOptFunc (S, &DOptPtrLoad13, 1);
Changes += RunOptFunc (S, &DOptPtrLoad14, 1);
Changes += RunOptFunc (S, &DOptPtrLoad15, 1);
Changes += RunOptFunc (S, &DOptPtrLoad16, 1);
Changes += RunOptFunc (S, &DOptPtrLoad17, 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, &DOptSub1, 1);
Changes += RunOptFunc (S, &DOptSub3, 1);
Changes += RunOptFunc (S, &DOptLongAssign, 1);
Changes += RunOptFunc (S, &DOptStore4, 1);
Changes += RunOptFunc (S, &DOptStore5, 1);
Changes += RunOptFunc (S, &DOptShift1, 1);
Changes += RunOptFunc (S, &DOptShift2, 1);
Changes += RunOptFunc (S, &DOptShift5, 1);
Changes += RunOptFunc (S, &DOptShift6, 1);
Changes += RunOptFunc (S, &DOptStore1, 1);
Changes += RunOptFunc (S, &DOptStore2, 5);
Changes += RunOptFunc (S, &DOptStore3, 5);
Changes += RunOptFunc (S, &DOptLongCopy, 1);
/* Return the number of changes */
return Changes;
}
static unsigned RunOptGroup2 (CodeSeg* S)
/* Run one group of optimization steps. This step involves just decoupling
** instructions by replacing them by instructions that do not depend on
** previous instructions. This makes it easier to find instructions that
** aren't used.
*/
{
unsigned Changes = 0;
Changes += RunOptFunc (S, &DOptDecouple, 1);
/* Return the number of changes */
return Changes;
}
static unsigned RunOptGroup3 (CodeSeg* S)
/* Run one group of optimization steps. These steps depend on each other,
** that means that one step may allow another step to do additional work,
** so we will repeat the steps as long as we see any changes.
*/
{
unsigned Changes, C;
Changes = 0;
do {
C = 0;
C += RunOptFunc (S, &DOptNegAX1, 1);
C += RunOptFunc (S, &DOptNegAX2, 1);
C += RunOptFunc (S, &DOptStackOps, 3); /* Before OptBoolUnary1 */
C += RunOptFunc (S, &DOptCmp8, 1); /* Before OptBoolUnary1 */
C += RunOptFunc (S, &DOptBoolUnary1, 3);
C += RunOptFunc (S, &DOptBoolUnary2, 3);
C += RunOptFunc (S, &DOptBoolUnary3, 1);
C += RunOptFunc (S, &DOptBNegA1, 1);
C += RunOptFunc (S, &DOptBNegAX1, 1); /* After OptBoolUnary2 */
C += RunOptFunc (S, &DOptShift1, 1);
C += RunOptFunc (S, &DOptShift4, 1);
C += RunOptFunc (S, &DOptComplAX1, 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, &DOptJumpCascades, 1);
C += RunOptFunc (S, &DOptDeadJumps, 1);
C += RunOptFunc (S, &DOptDeadCode, 1);
C += RunOptFunc (S, &DOptJumpTarget1, 1);
C += RunOptFunc (S, &DOptJumpTarget2, 1);
C += RunOptFunc (S, &DOptCondBranch1, 1);
C += RunOptFunc (S, &DOptCondBranch2, 1);
C += RunOptFunc (S, &DOptCondBranch3, 1);
C += RunOptFunc (S, &DOptCondBranchC, 1);
C += RunOptFunc (S, &DOptRTSJumps1, 1);
C += RunOptFunc (S, &DOptBoolCmp, 1);
C += RunOptFunc (S, &DOptBoolTrans, 1);
C += RunOptFunc (S, &DOptBNegA2, 1); /* After OptCondBranch's */
C += RunOptFunc (S, &DOptBNegAX2, 1); /* After OptCondBranch's */
C += RunOptFunc (S, &DOptBNegAX3, 1); /* After OptCondBranch's */
C += RunOptFunc (S, &DOptBNegAX4, 1); /* After OptCondBranch's */
C += RunOptFunc (S, &DOptCmp1, 1);
C += RunOptFunc (S, &DOptCmp2, 1);
C += RunOptFunc (S, &DOptCmp8, 1); /* Must run before OptCmp3 */
C += RunOptFunc (S, &DOptCmp3, 1);
C += RunOptFunc (S, &DOptCmp4, 1);
C += RunOptFunc (S, &DOptCmp5, 1);
C += RunOptFunc (S, &DOptCmp7, 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);
C += RunOptFunc (S, &DOptStoreLoad, 1);
C += RunOptFunc (S, &DOptLoadStoreLoad, 1);
C += RunOptFunc (S, &DOptTransfers1, 1);
C += RunOptFunc (S, &DOptTransfers3, 1);
C += RunOptFunc (S, &DOptTransfers4, 1);
C += RunOptFunc (S, &DOptStore1, 1);
C += RunOptFunc (S, &DOptStore5, 1);
C += RunOptFunc (S, &DOptPushPop1, 1);
C += RunOptFunc (S, &DOptPushPop2, 1);
C += RunOptFunc (S, &DOptPrecalc, 1);
C += RunOptFunc (S, &DOptShiftBack, 1);
C += RunOptFunc (S, &DOptSignExtended, 1);
Changes += C;
} while (C);
/* Return the number of changes */
return Changes;
}
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, &DOptShift3, 1);
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);
Changes += RunOptFunc (S, &DOptLoad3, 1);
Changes += RunOptFunc (S, &DOptDupLoads, 1);
/* Return the number of changes */
return Changes;
}
static unsigned RunOptGroup5 (CodeSeg* S)
/* 65C02 specific optimizations. */
{
unsigned Changes = 0;
if (CPUIsets[CPU] & CPU_ISET_65SC02) {
Changes += RunOptFunc (S, &DOpt65C02BitOps, 1);
Changes += RunOptFunc (S, &DOpt65C02Ind, 1);
Changes += RunOptFunc (S, &DOpt65C02Stores, 1);
if (Changes) {
/* The 65C02 replacement codes do often make the use of a register
** value unnecessary, so if we have changes, run another load
** removal pass.
*/
Changes += RunOptFunc (S, &DOptUnusedLoads, 1);
}
}
/* Return the number of changes */
return Changes;
}
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;
/* 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 RunOptGroup7 (CodeSeg* S)
/* The last group of optimization steps. Adjust branches, do size optimizations.
*/
{
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).
*/
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, &DOptUnusedStores, 1);
Changes += RunOptFunc (S, &DOptJumpTarget1, 5);
Changes += RunOptFunc (S, &DOptStore5, 1);
}
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, &DOptJumpTarget1, 5);
Changes += RunOptFunc (S, &DOptStore5, 1);
Changes += RunOptFunc (S, &DOptTransfers1, 1);
Changes += RunOptFunc (S, &DOptTransfers3, 1);
}
/* Adjust branch distances */
Changes += RunOptFunc (S, &DOptBranchDist, 3);
/* Replace conditional branches to RTS */
C = RunOptFunc (S, &DOptRTSJumps2, 1);
/* Replace JSR followed by RTS to JMP */
C += RunOptFunc (S, &DOptRTS, 1);
/* Replace JMP/BRA to JMP by direct JMP */
C += RunOptFunc (S, &DOptJumpCascades, 1);
C += RunOptFunc (S, &DOptBranchDist2, 1);
/* Adjust branch distances again, since the previous step may change code
between branches */
C += RunOptFunc (S, &DOptBranchDist, 3);
Changes += C;
/* If we had changes, we must run dead code elimination again,
** since the changes may have introduced dead code.
*/
if (C) {
Changes += RunOptFunc (S, &DOptDeadCode, 1);
}
/* Return the number of changes */
return Changes;
}
void RunOpt (CodeSeg* S)
/* Run the optimizer */
{
const char* StatFileName;
/* If we shouldn't run the optimizer, bail out */
if (!S->Optimize) {
return;
}
/* Check if we are requested to write optimizer statistics */
StatFileName = getenv ("CC65_OPTSTATS");
if (StatFileName) {
ReadOptStats (StatFileName);
}
/* Print the name of the function we are working on */
if (S->Func) {
Print (stdout, 1, "Running optimizer for function '%s'\n", S->Func->Name);
} else {
Print (stdout, 1, "Running optimizer for global code segment\n");
}
/* If requested, open an output file */
OpenDebugFile (S);
WriteDebugOutput (S, 0);
/* Generate register info for all instructions */
CS_GenRegInfo (S);
/* Run groups of optimizations */
RunOptGroup1 (S);
RunOptGroup2 (S);
RunOptGroup3 (S);
RunOptGroup4 (S);
RunOptGroup5 (S);
RunOptGroup6 (S);
RunOptGroup7 (S);
/* Free register info */
CS_FreeRegInfo (S);
/* Close output file if necessary */
if (DebugOptOutput) {
CloseOutputFile ();
}
/* Write statistics */
if (StatFileName) {
WriteOptStats (StatFileName);
}
}
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