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Zero-cycle JUMP

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Derek Christ
2023-12-12 17:15:29 +01:00
parent d519d9a37b
commit aecb19b4f4
3 changed files with 38 additions and 31 deletions
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53
pim-vm/src/lib.rs
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@@ -27,7 +27,8 @@ fn init_logger() {
env_logger::init();
}
const COLUMN_BIT_OFFSET: usize = 10;
const GRF_A_BIT_OFFSET: usize = 10;
const GRF_B_BIT_OFFSET: usize = 13;
const BURST_LENGTH: usize = 32;
const GRF_NUM_REGISTERS: usize = 8;
@@ -111,15 +112,35 @@ impl PimVM {
let pim_unit = &mut self.pim_units[bank_index as usize];
let current_pc = pim_unit.pc;
let mut inst = self.pim_config.kernel.0[pim_unit.pc as usize];
pim_unit.pc += 1;
let inst = self.pim_config.kernel.0[current_pc as usize];
let aam_grf_a_index = (address >> GRF_A_BIT_OFFSET) & 0b111;
let aam_grf_b_index = (address >> GRF_B_BIT_OFFSET) & 0b111;
let aam_grf_a_index = (address >> COLUMN_BIT_OFFSET) & 0b111;
let aam_grf_b_index = (address >> COLUMN_BIT_OFFSET + 3) & 0b111;
log::debug!("PimUnit {bank_index} Execute PC {}: {inst:?}", pim_unit.pc);
log::debug!("PimUnit {bank_index} Execute PC {current_pc}: {inst:?}");
// The JUMP instruction is zero-cycle and not actually executed
while let Instruction::JUMP { offset, count } = inst {
pim_unit.jump_counter = match pim_unit.jump_counter {
Some(jump_counter) => jump_counter.checked_sub(1),
None => count.checked_sub(1),
};
if pim_unit.jump_counter != None {
let new_pc = pim_unit.pc as i32 + offset as i32;
if new_pc < 0 || new_pc >= 32 {
panic!("Invalid PC {new_pc} after JUMP: {inst:?}");
}
pim_unit.pc = new_pc as _;
log::debug!("PimUnit {bank_index} New PC {new_pc}: {inst:?}");
}
inst = self.pim_config.kernel.0[pim_unit.pc as usize];
pim_unit.pc += 1;
}
match inst {
Instruction::NOP => (),
@@ -127,23 +148,7 @@ impl PimVM {
pim_unit.jump_counter = None;
pim_unit.pc = 0;
}
Instruction::JUMP { offset, count } => {
pim_unit.jump_counter = match pim_unit.jump_counter {
Some(jump_counter) => jump_counter.checked_sub(1),
None => count.checked_sub(1),
};
if pim_unit.jump_counter != None {
let new_pc = current_pc as i32 + offset as i32;
if new_pc < 0 || new_pc >= 32 {
panic!("Invalid PC {new_pc} after JUMP: {inst:?}");
}
pim_unit.pc = new_pc as _;
log::debug!("PimUnit {bank_index} New PC {new_pc}: {inst:?}");
}
}
Instruction::JUMP { .. } => unreachable!(),
Instruction::MOV { src, dst } | Instruction::FILL { src, dst } => {
let data = PimVM::load(src, pim_unit, &bank_data);
PimVM::store(dst, pim_unit, &data);
@@ -284,7 +289,7 @@ impl PimVM {
.try_into()
.unwrap();
log::debug!("{data0:#?}\n{data1:#?}\n{data2:#?}\n{product:#?}\n{sum:#?}");
log::debug!("{data0:?}\n{data1:?}\n{data2:?}\n{product:?}\n{sum:?}");
PimVM::store(dst, pim_unit, &sum);
}
}