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fix some issues with 64-bit moves on 32-bit machines

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This commit is contained in:
Joel Dice 2008-04-20 20:50:46 -06:00
parent 6b4cafd962
commit 571bffde09
2 changed files with 46 additions and 17 deletions
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8
src/compiler.cpp
View File

@ -15,8 +15,8 @@ using namespace vm;
namespace {
const bool DebugAppend = false;
const bool DebugCompile = false;
const bool DebugAppend = true;
const bool DebugCompile = true;
const bool DebugStack = false;
const bool DebugRegisters = false;
@ -824,8 +824,6 @@ bool
tryAcquire(Context* c, int r, Stack* stack, unsigned newSize, Value* newValue,
Site* newSite)
{
assert(c, newSize);
if (c->registers[r].reserved) return true;
if (DebugRegisters) {
@ -2213,7 +2211,7 @@ class MyCompiler: public Compiler {
virtual Operand* load4To8(Operand* src) {
Value* dst = value(&c);
appendMove(&c, Move4To8, 0, static_cast<Value*>(src), dst);
appendMove(&c, Move4To8, 8, static_cast<Value*>(src), dst);
return dst;
}

55
src/x86.cpp
View File

@ -643,11 +643,25 @@ void
move4To8RR(Context* c, unsigned size UNUSED, Assembler::Register* a,
Assembler::Register* b)
{
assert(c, BytesPerWord == 8);
if (BytesPerWord == 8) {
rex(c);
c->code.append(0x63);
c->code.append(0xc0 | (a->low << 3) | b->low);
} else {
if (a->low == rax and b->low == rax and b->high == rdx) {
c->code.append(0x99); // cdq
} else {
Assembler::Register axdx(c->client->acquireTemporary(rax),
c->client->acquireTemporary(rdx));
rex(c);
c->code.append(0x63);
c->code.append(0xc0 | (a->low << 3) | b->low);
moveRR(c, 4, a, &axdx);
move4To8RR(c, 0, &axdx, &axdx);
moveRR(c, 8, &axdx, b);
c->client->releaseTemporary(axdx.low);
c->client->releaseTemporary(axdx.high);
}
}
}
void
@ -710,20 +724,37 @@ void
moveMM(Context* c, unsigned size, Assembler::Memory* a,
Assembler::Memory* b)
{
assert(c, BytesPerWord == 8 or size <= 4); // todo
Assembler::Register tmp(c->client->acquireTemporary());
moveMR(c, size, a, &tmp);
moveRM(c, size, &tmp, b);
c->client->releaseTemporary(tmp.low);
if (BytesPerWord == 8 or size <= 4) {
Assembler::Register tmp(c->client->acquireTemporary());
moveMR(c, size, a, &tmp);
moveRM(c, size, &tmp, b);
c->client->releaseTemporary(tmp.low);
} else {
Assembler::Register tmp(c->client->acquireTemporary(),
c->client->acquireTemporary());
moveMR(c, size, a, &tmp);
moveRM(c, size, &tmp, b);
c->client->releaseTemporary(tmp.low);
c->client->releaseTemporary(tmp.high);
}
}
void
move4To8MR(Context* c, unsigned, Assembler::Memory* a, Assembler::Register* b)
{
assert(c, BytesPerWord == 8); // todo
if (BytesPerWord == 8) {
encode(c, 0x63, b->low, a, true);
} else {
Assembler::Register axdx(c->client->acquireTemporary(rax),
c->client->acquireTemporary(rdx));
encode(c, 0x63, b->low, a, true);
moveMR(c, 4, a, &axdx);
move4To8RR(c, 0, &axdx, &axdx);
moveRR(c, 8, &axdx, b);
c->client->releaseTemporary(axdx.low);
c->client->releaseTemporary(axdx.high);
}
}
void