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Remove Rotate* & Duplicate* instructions #6303

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Merged
youknowone merged 4 commits into from
Nov 28, 2025
Merged

Remove Rotate* & Duplicate* instructions #6303

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8c7674c
Remove `Instruction::Duplicate2?`
ShaharNaveh Nov 28, 2025
0f4f62f
Remove `Instruction::Rotate*` instructions
ShaharNaveh Nov 28, 2025
3a04abd
Fix jit
ShaharNaveh Nov 28, 2025
bce1c66
Update snapshot
ShaharNaveh Nov 28, 2025
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Remove Instruction::Duplicate2?
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@ShaharNaveh
ShaharNaveh committed Nov 28, 2025
commit 8c7674cabbc05a9414c58570a663f4ba6a4caba9
27 changes: 14 additions & 13 deletions crates/codegen/src/compile.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1063,7 +1063,7 @@ impl Compiler {

if let Stmt::Expr(StmtExpr { value, .. }) = &last {
self.compile_expression(value)?;
emit!(self, Instruction::Duplicate);
emit!(self, Instruction::CopyItem { index: 1_u32 });
emit!(self, Instruction::PrintExpr);
} else {
self.compile_statement(last)?;
Expand Down Expand Up @@ -1094,7 +1094,7 @@ impl Compiler {
Stmt::FunctionDef(_) | Stmt::ClassDef(_) => {
let pop_instructions = self.current_block().instructions.pop();
let store_inst = compiler_unwrap_option(self, pop_instructions); // pop Instruction::Store
emit!(self, Instruction::Duplicate);
emit!(self, Instruction::CopyItem { index: 1_u32 });
self.current_block().instructions.push(store_inst);
}
_ => self.emit_load_const(ConstantData::None),
Expand Down Expand Up @@ -1656,7 +1656,7 @@ impl Compiler {

for (i, target) in targets.iter().enumerate() {
if i + 1 != targets.len() {
emit!(self, Instruction::Duplicate);
emit!(self, Instruction::CopyItem { index: 1_u32 });
}
self.compile_store(target)?;
}
Expand Down Expand Up @@ -1917,7 +1917,7 @@ impl Compiler {
);
}

emit!(self, Instruction::Duplicate);
emit!(self, Instruction::CopyItem { index: 1_u32 });
self.store_name(name.as_ref())?;
}
TypeParam::ParamSpec(TypeParamParamSpec { name, default, .. }) => {
Expand All @@ -1943,7 +1943,7 @@ impl Compiler {
);
}

emit!(self, Instruction::Duplicate);
emit!(self, Instruction::CopyItem { index: 1_u32 });
self.store_name(name.as_ref())?;
}
TypeParam::TypeVarTuple(TypeParamTypeVarTuple { name, default, .. }) => {
Expand All @@ -1970,7 +1970,7 @@ impl Compiler {
);
}

emit!(self, Instruction::Duplicate);
emit!(self, Instruction::CopyItem { index: 1_u32 });
self.store_name(name.as_ref())?;
}
};
Expand Down Expand Up @@ -2030,7 +2030,7 @@ impl Compiler {
// check if this handler can handle the exception:
if let Some(exc_type) = type_ {
// Duplicate exception for test:
emit!(self, Instruction::Duplicate);
emit!(self, Instruction::CopyItem { index: 1_u32 });

// Check exception type:
self.compile_expression(exc_type)?;
Expand Down Expand Up @@ -2251,7 +2251,7 @@ impl Compiler {

// Handle docstring if present
if let Some(doc) = doc_str {
emit!(self, Instruction::Duplicate);
emit!(self, Instruction::CopyItem { index: 1_u32 });
self.emit_load_const(ConstantData::Str {
value: doc.to_string().into(),
});
Expand Down Expand Up @@ -2726,7 +2726,7 @@ impl Compiler {

if let Some(classcell_idx) = classcell_idx {
emit!(self, Instruction::LoadClosure(classcell_idx.to_u32()));
emit!(self, Instruction::Duplicate);
emit!(self, Instruction::CopyItem { index: 1_u32 });
let classcell = self.name("__classcell__");
emit!(self, Instruction::StoreLocal(classcell));
} else {
Expand Down Expand Up @@ -4121,7 +4121,7 @@ impl Compiler {
for (op, val) in mid_ops.iter().zip(mid_exprs) {
self.compile_expression(val)?;
// store rhs for the next comparison in chain
emit!(self, Instruction::Duplicate);
emit!(self, Instruction::CopyItem { index: 1_u32 });
emit!(self, Instruction::Rotate3);

compile_cmpop(self, op);
Expand Down Expand Up @@ -4322,15 +4322,16 @@ impl Compiler {
// But we can't use compile_subscript directly because we need DUP_TOP2
self.compile_expression(value)?;
self.compile_expression(slice)?;
emit!(self, Instruction::Duplicate2);
emit!(self, Instruction::CopyItem { index: 2_u32 });
emit!(self, Instruction::CopyItem { index: 2_u32 });
emit!(self, Instruction::Subscript);
AugAssignKind::Subscript
}
Expr::Attribute(ExprAttribute { value, attr, .. }) => {
let attr = attr.as_str();
self.check_forbidden_name(attr, NameUsage::Store)?;
self.compile_expression(value)?;
emit!(self, Instruction::Duplicate);
emit!(self, Instruction::CopyItem { index: 1_u32 });
let idx = self.name(attr);
emit!(self, Instruction::LoadAttr { idx });
AugAssignKind::Attr { idx }
Expand Down Expand Up @@ -4896,7 +4897,7 @@ impl Compiler {
range: _,
}) => {
self.compile_expression(value)?;
emit!(self, Instruction::Duplicate);
emit!(self, Instruction::CopyItem { index: 1_u32 });
self.compile_store(target)?;
}
Expr::FString(fstring) => {
Expand Down
6 changes: 0 additions & 6 deletions crates/compiler-core/src/bytecode.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -616,8 +616,6 @@ pub enum Instruction {
ToBool,
Rotate2,
Rotate3,
Duplicate,
Duplicate2,
GetIter,
GetLen,
CallIntrinsic1 {
Expand Down Expand Up @@ -1476,8 +1474,6 @@ impl Instruction {
Swap { .. } => 0,
ToBool => 0,
Rotate2 | Rotate3 => 0,
Duplicate => 1,
Duplicate2 => 2,
GetIter => 0,
GetLen => 1,
CallIntrinsic1 { .. } => 0, // Takes 1, pushes 1
Expand Down Expand Up @@ -1680,8 +1676,6 @@ impl Instruction {
ToBool => w!(ToBool),
Rotate2 => w!(Rotate2),
Rotate3 => w!(Rotate3),
Duplicate => w!(Duplicate),
Duplicate2 => w!(Duplicate2),
GetIter => w!(GetIter),
// GET_LEN
GetLen => w!(GetLen),
Expand Down
29 changes: 9 additions & 20 deletions crates/vm/src/frame.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -719,27 +719,16 @@ impl ExecutingFrame<'_> {
self.state.stack.swap(i, j);
Ok(None)
}
// bytecode::Instruction::ToBool => {
// dbg!("Shouldn't be called outside of match statements for now")
// let value = self.pop_value();
// // call __bool__
// let result = value.try_to_bool(vm)?;
// self.push_value(vm.ctx.new_bool(result).into());
// Ok(None)
// }
bytecode::Instruction::Duplicate => {
// Duplicate top of stack
let value = self.top_value();
self.push_value(value.to_owned());
Ok(None)
}
bytecode::Instruction::Duplicate2 => {
// Duplicate top 2 of stack
let len = self.state.stack.len();
self.push_value(self.state.stack[len - 2].clone());
self.push_value(self.state.stack[len - 1].clone());
Ok(None)
/*
bytecode::Instruction::ToBool => {
dbg!("Shouldn't be called outside of match statements for now")
let value = self.pop_value();
// call __bool__
let result = value.try_to_bool(vm)?;
self.push_value(vm.ctx.new_bool(result).into());
Ok(None)
}
*/
// splitting the instructions like this offloads the cost of "dynamic" dispatch (on the
// amount to rotate) to the opcode dispatcher, and generates optimized code for the
// concrete cases we actually have
Expand Down