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even more code improvement

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R=r
OCL=21160
CL=21160
This commit is contained in:
Ken Thompson 2008-12-14 18:45:00 -08:00
parent 23fc0ac061
commit 42d89ac02c
5 changed files with 128 additions and 100 deletions
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113
src/cmd/6g/gen.c
View File

@ -915,46 +915,12 @@ cgen_asop(Node *n)
{
Node n1, n2, n3, n4;
Node *nl, *nr;
Prog *p1;
Addr addr;
nl = n->left;
nr = n->right;
if(nl->addable && nr->op == OLITERAL)
switch(n->etype) {
case OADD:
if(!isint[nl->type->etype])
break;
if(mpgetfix(nr->val.u.xval) != 1)
break;
gins(optoas(OINC, nl->type), N, nl);
goto ret;
case OSUB:
if(!isint[nl->type->etype])
break;
if(mpgetfix(nr->val.u.xval) != 1)
break;
gins(optoas(ODEC, nl->type), N, nl);
goto ret;
}
if(nl->addable)
switch(n->etype) {
case OXOR:
case OAND:
case OOR:
case OADD:
case OSUB:
if(!isint[nl->type->etype])
break;
if(!isint[nr->type->etype])
break;
regalloc(&n2, nr->type, N);
cgen(nr, &n2);
gins(optoas(n->etype, nl->type), &n2, nl);
regfree(&n2);
goto ret;
}
if(nr->ullman >= UINF && nl->ullman >= UINF) {
tempname(&n1, nr->type);
cgen(nr, &n1);
@ -964,6 +930,81 @@ cgen_asop(Node *n)
goto ret;
}
if(!isint[nl->type->etype])
goto hard;
if(!isint[nr->type->etype])
goto hard;
switch(n->etype) {
case OADD:
if(smallintconst(nr))
if(mpgetfix(nr->val.u.xval) == 1) {
if(nl->addable) {
gins(optoas(OINC, nl->type), N, nl);
goto ret;
}
if(sudoaddable(nl, nr->type, &addr)) {
p1 = gins(optoas(OINC, nl->type), N, N);
p1->to = addr;
sudoclean();
goto ret;
}
}
break;
case OSUB:
if(smallintconst(nr))
if(mpgetfix(nr->val.u.xval) == 1) {
if(nl->addable) {
gins(optoas(ODEC, nl->type), N, nl);
goto ret;
}
if(sudoaddable(nl, nr->type, &addr)) {
p1 = gins(optoas(ODEC, nl->type), N, N);
p1->to = addr;
sudoclean();
goto ret;
}
}
break;
}
switch(n->etype) {
case OADD:
case OSUB:
case OXOR:
case OAND:
case OOR:
if(nl->addable) {
if(smallintconst(nr)) {
gins(optoas(n->etype, nl->type), nr, nl);
goto ret;
}
regalloc(&n2, nr->type, N);
cgen(nr, &n2);
gins(optoas(n->etype, nl->type), &n2, nl);
regfree(&n2);
goto ret;
}
if(nr->ullman < UINF)
if(sudoaddable(nl, nr->type, &addr)) {
if(smallintconst(nr)) {
p1 = gins(optoas(n->etype, nl->type), nr, N);
p1->to = addr;
sudoclean();
goto ret;
}
regalloc(&n2, nr->type, N);
cgen(nr, &n2);
p1 = gins(optoas(n->etype, nl->type), &n2, N);
p1->to = addr;
regfree(&n2);
sudoclean();
goto ret;
}
}
hard:
if(nr->ullman > nl->ullman) {
regalloc(&n2, nr->type, N);
cgen(nr, &n2);

1
src/cmd/6g/gg.h
View File

@ -199,7 +199,6 @@ void tempname(Node*, Type*);
Plist* newplist(void);
int isfat(Type*);
void setmaxarg(Type*);
int smallintconst(Node*);
void sudoclean(void);
int sudoaddable(Node*, Type*, Addr*);

95
src/cmd/6g/gsubr.c
View File

@ -102,6 +102,19 @@ newplist(void)
return pl;
}
static int resvd[] =
{
// D_DI, // for movstring
// D_SI, // for movstring
D_AX, // for divide
D_CX, // for shift
D_DX, // for divide
D_SP, // for stack
D_R14, // reserved for m
D_R15, // reserved for u
};
void
ginit(void)
{
@ -114,15 +127,8 @@ ginit(void)
for(i=D_X0; i<=D_X7; i++)
reg[i] = 0;
// reg[D_DI]++; // for movstring
// reg[D_SI]++; // for movstring
reg[D_AX]++; // for divide
reg[D_CX]++; // for shift
reg[D_DX]++; // for divide
reg[D_SP]++; // for stack
reg[D_R14]++; // reserved for m
reg[D_R15]++; // reserved for u
for(i=0; i<nelem(resvd); i++)
reg[resvd[i]]++;
}
void
@ -130,15 +136,8 @@ gclean(void)
{
int i;
// reg[D_DI]--; // for movstring
// reg[D_SI]--; // for movstring
reg[D_AX]--; // for divide
reg[D_CX]--; // for shift
reg[D_DX]--; // for divide
reg[D_SP]--; // for stack
reg[D_R14]--; // reserved for m
reg[D_R15]--; // reserved for u
for(i=0; i<nelem(resvd); i++)
reg[resvd[i]]--;
for(i=D_AX; i<=D_R15; i++)
if(reg[i])
@ -1817,24 +1816,6 @@ dotoffset(Node *n, int *oary, Node **nn)
return i;
}
int
smallintconst(Node *n)
{
if(n->op == OLITERAL)
switch(simtype[n->type->etype]) {
case TINT8:
case TUINT8:
case TINT16:
case TUINT16:
case TINT32:
case TUINT32:
case TBOOL:
case TPTR32:
return 1;
}
return 0;
}
enum
{
ODynam = 1<<0,
@ -1857,37 +1838,36 @@ sudoclean(void)
int
sudoaddable(Node *n, Type *t, Addr *a)
{
int et, o, i, w;
int o, i, w;
int oary[10];
vlong v;
Node n0, n1, n2, *nn, *l, *r;
Node n1, n2, *nn, *l, *r;
Node *reg, *reg1;
Prog *p1;
// make a cleanup slot
cleani += 2;
reg = &clean[cleani-1];
reg1 = &clean[cleani-2];
reg->op = OEMPTY;
reg1->op = OEMPTY;
if(n->type == T || t == T)
goto no;
et = simtype[n->type->etype];
if(et != simtype[t->etype])
goto no;
return 0;
switch(n->op) {
default:
goto no;
return 0;
case ODOT:
case ODOTPTR:
cleani += 2;
reg = &clean[cleani-1];
reg1 = &clean[cleani-2];
reg->op = OEMPTY;
reg1->op = OEMPTY;
goto odot;
case OINDEXPTR:
goto no;
case OINDEX:
cleani += 2;
reg = &clean[cleani-1];
reg1 = &clean[cleani-2];
reg->op = OEMPTY;
reg1->op = OEMPTY;
goto oindex;
}
@ -1895,15 +1875,6 @@ odot:
o = dotoffset(n, oary, &nn);
if(nn == N)
goto no;
if(0) {
dump("\nXX", n);
dump("YY", nn);
for(i=0; i<o; i++)
print(" %d", oary[i]);
print("\n");
goto no;
}
regalloc(reg, types[tptr], N);
n1 = *reg;
@ -1931,7 +1902,7 @@ odot:
oindex:
l = n->left;
r = n->right;
if(l->ullman >= UINF || r->ullman >= UINF)
if(l->ullman >= UINF && r->ullman >= UINF)
goto no;
// set o to type of array
@ -1950,8 +1921,6 @@ oindex:
}
w = n->type->width;
if(w == 0)
fatal("index is zero width");
if(whatis(r) == Wlitint)
goto oindex_const;

18
src/cmd/gc/const.c
View File

@ -540,3 +540,21 @@ cmpslit(Node *l, Node *r)
return +1;
return -1;
}
int
smallintconst(Node *n)
{
if(n->op == OLITERAL)
switch(simtype[n->type->etype]) {
case TINT8:
case TUINT8:
case TINT16:
case TUINT16:
case TINT32:
case TUINT32:
case TBOOL:
case TPTR32:
return 1;
}
return 0;
}

1
src/cmd/gc/go.h
View File

@ -826,6 +826,7 @@ void convlit1(Node*, Type*, int);
void convlit(Node*, Type*);
void evconst(Node*);
int cmpslit(Node *l, Node *r);
int smallintconst(Node*);
/*
* gen.c/gsubr.c/obj.c