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Add support for stack integers (#135)

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* add support for stack integers

* update documentation

* revise value type stack variables
This commit is contained in:
water111
2020-11-22 12:22:19 -05:00
committed by GitHub
parent 66c9f40e13
commit 460ec874bb
19 changed files with 288 additions and 41 deletions
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goalc/compiler/IR.cpp
+55 -20
View File
@@ -11,6 +11,30 @@ Register get_reg(const RegVal* rv, const AllocationResult& allocs, emitter::IR_R
assert(ass.kind == Assignment::Kind::REGISTER);
return ass.reg;
}
void load_constant(u64 value,
emitter::ObjectGenerator* gen,
emitter::IR_Record irec,
Register dest_reg) {
s64 svalue = value;
if (svalue == 0) {
gen->add_instr(IGen::xor_gpr64_gpr64(dest_reg, dest_reg), irec);
} else if (svalue > 0) {
if (svalue < UINT32_MAX) {
gen->add_instr(IGen::mov_gpr64_u32(dest_reg, value), irec);
} else {
// need a real 64 bit load
gen->add_instr(IGen::mov_gpr64_u64(dest_reg, value), irec);
}
} else {
if (svalue >= INT32_MIN) {
gen->add_instr(IGen::mov_gpr64_s32(dest_reg, svalue), irec);
} else {
// need a real 64 bit load
gen->add_instr(IGen::mov_gpr64_u64(dest_reg, value), irec);
}
}
}
} // namespace
///////////
@@ -77,26 +101,7 @@ void IR_LoadConstant64::do_codegen(emitter::ObjectGenerator* gen,
const AllocationResult& allocs,
emitter::IR_Record irec) {
auto dest_reg = get_reg(m_dest, allocs, irec);
s64 svalue = m_value;
if (svalue == 0) {
gen->add_instr(IGen::xor_gpr64_gpr64(dest_reg, dest_reg), irec);
} else if (svalue > 0) {
if (svalue < UINT32_MAX) {
gen->add_instr(IGen::mov_gpr64_u32(dest_reg, m_value), irec);
} else {
// need a real 64 bit load
gen->add_instr(IGen::mov_gpr64_u64(dest_reg, m_value), irec);
}
} else {
if (svalue >= INT32_MIN) {
gen->add_instr(IGen::mov_gpr64_s32(dest_reg, svalue), irec);
} else {
// need a real 64 bit load
gen->add_instr(IGen::mov_gpr64_u64(dest_reg, m_value), irec);
}
}
load_constant(m_value, gen, irec, dest_reg);
}
/////////////////////
@@ -858,4 +863,34 @@ void IR_IntToFloat::do_codegen(emitter::ObjectGenerator* gen,
emitter::IR_Record irec) {
gen->add_instr(IGen::int32_to_float(get_reg(m_dest, allocs, irec), get_reg(m_src, allocs, irec)),
irec);
}
///////////////////////
// GetStackAddr
///////////////////////
IR_GetStackAddr::IR_GetStackAddr(const RegVal* dest, int slot) : m_dest(dest), m_slot(slot) {}
std::string IR_GetStackAddr::print() {
return fmt::format("mov {}, stack-slot-{}", m_dest->print(), m_slot);
}
RegAllocInstr IR_GetStackAddr::to_rai() {
RegAllocInstr rai;
rai.write.push_back(m_dest->ireg());
return rai;
}
void IR_GetStackAddr::do_codegen(emitter::ObjectGenerator* gen,
const AllocationResult& allocs,
emitter::IR_Record irec) {
auto dest_reg = get_reg(m_dest, allocs, irec);
int offset = GPR_SIZE * (m_slot + allocs.stack_slots_for_spills);
// dest = offset
load_constant(offset, gen, irec, dest_reg);
// dest = offset + RSP
gen->add_instr(IGen::add_gpr64_gpr64(dest_reg, RSP), irec);
// dest = offset + RSP - offset
gen->add_instr(IGen::sub_gpr64_gpr64(dest_reg, gRegInfo.get_offset_reg()), irec);
}