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support 1- and 2-byte moves to memory

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This commit is contained in:
Joel Dice 2008-03-15 15:02:19 -06:00
parent 8141fc21b4
commit 420a054fd8
3 changed files with 55 additions and 19 deletions
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2
src/assembler.h
View File

@ -137,7 +137,7 @@ class Assembler {
public:
virtual ~Client() { }
virtual int acquireTemporary() = 0;
virtual int acquireTemporary(int r = NoRegister) = 0;
virtual void releaseTemporary(int r) = 0;
};

9
src/compiler.cpp
View File

@ -1512,8 +1512,13 @@ class Client: public Assembler::Client {
public:
Client(Context* c): c(c) { }
virtual int acquireTemporary() {
int r = freeRegisterExcept(c, NoRegister, false);
virtual int acquireTemporary(int r) {
if (r == NoRegister) {
r = freeRegisterExcept(c, NoRegister, false);
} else {
expect(c, not c->registers[r].reserved);
expect(c, c->registers[r].operand == 0);
}
c->registers[r].reserved = true;
return r;
}

63
src/x86.cpp
View File

@ -528,6 +528,25 @@ moveCM(Context* c, unsigned size UNUSED, Assembler::Constant* a,
c->code.append4(a->value->value());
}
void
moveRR(Context* c, unsigned size, Assembler::Register* a,
Assembler::Register* b)
{
if (BytesPerWord == 4 and size == 8) {
Assembler::Register ah(a->low);
Assembler::Register bh(b->low);
moveRR(c, 4, a, b);
moveRR(c, 4, &ah, &bh);
} else {
assert(c, BytesPerWord == 8 or size == 4); // todo
rex(c);
c->code.append(0x89);
c->code.append(0xc0 | (a->low << 3) | b->low);
}
}
void
moveRM(Context* c, unsigned size, Assembler::Register* a, Assembler::Memory* b)
{
@ -540,24 +559,36 @@ moveRM(Context* c, unsigned size, Assembler::Register* a, Assembler::Memory* b)
} else if (BytesPerWord == 8 and size == 4) {
encode(c, 0x89, a->low, b, false);
} else {
encode(c, 0x89, a->low, b, true);
}
}
switch (size) {
case 1:
if (BytesPerWord == 8) {
if (a->low > rbx) {
encode2(c, 0x4088, a->low, b, false);
} else {
encode(c, 0x88, a->low, b, false);
}
} else {
if (a->low > rbx) {
Assembler::Register ax(c->client->acquireTemporary(rax));
moveRR(c, BytesPerWord, a, &ax);
moveRM(c, 1, &ax, b);
c->client->releaseTemporary(ax.low);
} else {
encode(c, 0x88, a->low, b, false);
}
}
break;
void
moveRR(Context* c, unsigned size, Assembler::Register* a,
Assembler::Register* b)
{
if (BytesPerWord == 4 and size == 8) {
Assembler::Register ah(a->low);
Assembler::Register bh(b->low);
case 2:
encode2(c, 0x6689, a->low, b, false);
break;
moveRR(c, 4, a, b);
moveRR(c, 4, &ah, &bh);
} else {
rex(c);
c->code.append(0x89);
c->code.append(0xc0 | (a->low << 3) | b->low);
case BytesPerWord:
encode(c, 0x89, a->low, b, true);
break;
default: abort(c);
}
}
}