Add stack-to-local promotion, verify all optimizations end-to-end
Stack-to-local promotion (Phase 1): - is_promotable() identifies straight-line words (no control flow/calls/I/O) - StackSim maps stack slots to WASM locals - Stack manipulation (Swap, Rot, Nip, Tuck, Dup, Drop) emits ZERO instructions - Prologue loads items from memory, epilogue writes back - ~7x instruction reduction for DUP * and similar patterns End-to-end verification (16 tests proving each optimization is active): - verify_peephole_active: 0+ elimination - verify_constant_folding_active: 3 4 + folded to 7 - verify_strength_reduction_active: 4* becomes shift - verify_dce_active: code after EXIT eliminated - verify_tail_call_active: recursive RECURSE works - verify_inlining_active: small word inlined and folded - verify_compound_ops_active: 2DUP works - verify_dsp_caching_active: factorial via RECURSE - verify_consolidation_active: CONSOLIDATE word - verify_stack_promotion_*: 7 tests for promoted codegen 22 additional codegen promotion tests (wasmtime execution). Fix F~ stack overflow panic (checked_sub instead of unchecked). 380 unit tests + 11 compliance tests, all passing.
This commit is contained in:
+766
-3
@@ -781,6 +781,539 @@ fn emit_do_loop(f: &mut Function, body: &[IrOp], is_plus_loop: bool) {
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f.instruction(&Instruction::Drop);
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}
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// ---------------------------------------------------------------------------
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// Stack-to-local promotion
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// ---------------------------------------------------------------------------
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/// Check if a word body qualifies for stack-to-local promotion.
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///
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/// Phase 1: only straight-line code (no control flow, calls, I/O, return stack).
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fn is_promotable(ops: &[IrOp]) -> bool {
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if ops.is_empty() {
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return false;
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}
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for op in ops {
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match op {
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IrOp::Call(_) | IrOp::TailCall(_) | IrOp::Execute => return false,
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IrOp::If { .. }
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| IrOp::DoLoop { .. }
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| IrOp::BeginUntil { .. }
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| IrOp::BeginAgain { .. }
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| IrOp::BeginWhileRepeat { .. }
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| IrOp::BeginDoubleWhileRepeat { .. } => return false,
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IrOp::Exit => return false,
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IrOp::ToR | IrOp::FromR | IrOp::RFetch => return false,
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IrOp::Emit | IrOp::Dot | IrOp::Cr | IrOp::Type => return false,
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IrOp::PushI64(_) | IrOp::PushF64(_) => return false,
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_ => {}
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}
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}
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true
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}
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/// Compute the net stack depth change for a single IR operation.
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fn stack_delta(op: &IrOp) -> i32 {
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match op {
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IrOp::PushI32(_) | IrOp::Dup | IrOp::Over | IrOp::Tuck => 1,
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IrOp::Drop | IrOp::Nip => -1,
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IrOp::Swap | IrOp::Rot => 0,
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IrOp::Add
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| IrOp::Sub
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| IrOp::Mul
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| IrOp::And
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| IrOp::Or
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| IrOp::Xor
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| IrOp::Lshift
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| IrOp::Rshift
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| IrOp::ArithRshift
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| IrOp::Eq
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| IrOp::NotEq
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| IrOp::Lt
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| IrOp::Gt
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| IrOp::LtUnsigned => -1,
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IrOp::DivMod => 0, // 2->2
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IrOp::Negate | IrOp::Abs | IrOp::Invert | IrOp::ZeroEq | IrOp::ZeroLt => 0,
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IrOp::Fetch | IrOp::CFetch => 0, // 1->1
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IrOp::Store | IrOp::CStore | IrOp::PlusStore => -2,
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IrOp::TwoDup => 2,
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IrOp::TwoDrop => -2,
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_ => 0,
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}
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}
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/// Compute how many pre-existing stack items a word body needs.
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///
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/// Returns `(preload_count, net_depth_change)` where `preload_count` is the
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/// number of items that must be loaded from the memory stack before execution.
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///
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/// The key insight: some ops READ existing stack positions without consuming
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/// them (e.g., `Dup` reads the top). We must track the minimum stack position
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/// that any op reads from, not just the net depth after consumption.
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fn compute_stack_needs(ops: &[IrOp]) -> (u32, i32) {
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let mut depth: i32 = 0;
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let mut min_accessed: i32 = 0; // most negative position accessed
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for op in ops {
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// Determine the deepest position this op reads from relative to
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// current depth. Position 0 = top of stack = depth-1 from base.
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let reads_from = match op {
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// These read the top without consuming:
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IrOp::Dup => depth - 1,
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// Reads top and second without consuming:
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IrOp::Over => depth - 2,
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IrOp::TwoDup => depth - 2,
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// Reads/rearranges top 2:
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IrOp::Swap | IrOp::Nip | IrOp::Tuck => depth - 2,
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// Reads/rearranges top 3:
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IrOp::Rot => depth - 3,
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// Binary ops consume 2:
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IrOp::Add
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| IrOp::Sub
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| IrOp::Mul
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| IrOp::And
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| IrOp::Or
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| IrOp::Xor
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| IrOp::Lshift
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| IrOp::Rshift
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| IrOp::ArithRshift
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| IrOp::Eq
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| IrOp::NotEq
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| IrOp::Lt
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| IrOp::Gt
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| IrOp::LtUnsigned
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| IrOp::DivMod
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| IrOp::Store
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| IrOp::CStore
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| IrOp::PlusStore => depth - 2,
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// Unary ops consume 1:
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IrOp::Drop
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| IrOp::Negate
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| IrOp::Abs
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| IrOp::Invert
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| IrOp::ZeroEq
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| IrOp::ZeroLt
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| IrOp::Fetch
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| IrOp::CFetch => depth - 1,
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IrOp::TwoDrop => depth - 2,
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// Push ops don't read existing items
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_ => depth,
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};
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min_accessed = min_accessed.min(reads_from);
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depth += stack_delta(op);
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}
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let preload = if min_accessed < 0 {
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(-min_accessed) as u32
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} else {
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0
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};
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(preload, depth)
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}
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/// Count how many WASM locals the promoted code path needs (excluding cached
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/// DSP and scratch locals). This is an upper bound -- we allocate a fresh
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/// local for each value-producing operation.
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fn count_promoted_locals(ops: &[IrOp], preload: u32) -> u32 {
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let mut count = preload;
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for op in ops {
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match op {
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IrOp::PushI32(_) => count += 1,
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IrOp::Add
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| IrOp::Sub
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| IrOp::Mul
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| IrOp::And
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| IrOp::Or
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| IrOp::Xor
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| IrOp::Lshift
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| IrOp::Rshift
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| IrOp::ArithRshift
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| IrOp::Eq
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| IrOp::NotEq
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| IrOp::Lt
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| IrOp::Gt
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| IrOp::LtUnsigned
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| IrOp::Negate
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| IrOp::Abs
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| IrOp::Invert
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| IrOp::ZeroEq
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| IrOp::ZeroLt
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| IrOp::Fetch
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| IrOp::CFetch => count += 1,
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IrOp::DivMod => count += 2,
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IrOp::Dup | IrOp::Over | IrOp::Tuck | IrOp::TwoDup => {
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// These reuse existing locals via the simulator, no extra needed
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}
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_ => {}
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}
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}
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count
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}
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/// Stack simulator: tracks which WASM local holds each conceptual stack slot.
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struct StackSim {
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/// Conceptual stack: `stack[0]` = bottom, `stack.last()` = top.
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/// Each entry is a WASM local index.
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stack: Vec<u32>,
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/// Next available local index.
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next_local: u32,
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}
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impl StackSim {
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fn new(first_local: u32) -> Self {
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Self {
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stack: Vec::new(),
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next_local: first_local,
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}
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}
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/// Allocate a fresh WASM local and return its index.
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fn alloc(&mut self) -> u32 {
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let l = self.next_local;
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self.next_local += 1;
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l
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}
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/// Push a local index onto the conceptual stack.
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fn push(&mut self, local: u32) {
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self.stack.push(local);
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}
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/// Pop the top local index from the conceptual stack.
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fn pop(&mut self) -> u32 {
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self.stack.pop().expect("promoted stack underflow")
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}
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/// Peek at the top of the conceptual stack.
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fn peek(&self) -> u32 {
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*self.stack.last().expect("promoted stack empty")
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}
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/// Peek at a position relative to the top (0 = top, 1 = second, etc.).
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fn peek_at(&self, from_top: usize) -> u32 {
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self.stack[self.stack.len() - 1 - from_top]
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}
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fn swap(&mut self) {
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let len = self.stack.len();
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self.stack.swap(len - 1, len - 2);
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}
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fn rot(&mut self) {
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// ( a b c -- b c a ) : remove third from top, push to top
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let len = self.stack.len();
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let a = self.stack.remove(len - 3);
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self.stack.push(a);
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}
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}
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/// Emit the promoted prologue: load `preload` items from the memory stack
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/// into WASM locals.
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fn emit_promoted_prologue(f: &mut Function, preload: u32, sim: &mut StackSim) {
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// Load items: mem[dsp] = top of stack, mem[dsp+4] = second, etc.
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// We load them top-first, then reverse the sim stack so that
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// sim.stack[0] = deepest loaded, sim.stack[last] = top.
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for i in 0..preload {
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let local = sim.alloc();
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f.instruction(&Instruction::LocalGet(CACHED_DSP_LOCAL));
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if i > 0 {
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f.instruction(&Instruction::I32Const((i * CELL_SIZE) as i32));
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f.instruction(&Instruction::I32Add);
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}
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f.instruction(&Instruction::I32Load(MEM4));
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f.instruction(&Instruction::LocalSet(local));
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sim.push(local);
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}
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// Reverse so stack[0] = deepest, stack[last] = top
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sim.stack.reverse();
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// Advance cached DSP past preloaded items
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if preload > 0 {
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f.instruction(&Instruction::LocalGet(CACHED_DSP_LOCAL));
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f.instruction(&Instruction::I32Const((preload * CELL_SIZE) as i32));
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f.instruction(&Instruction::I32Add);
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f.instruction(&Instruction::LocalSet(CACHED_DSP_LOCAL));
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}
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}
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/// Emit the promoted epilogue: write remaining stack items back to memory.
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fn emit_promoted_epilogue(f: &mut Function, sim: &mut StackSim) {
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let remaining = sim.stack.len() as u32;
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if remaining > 0 {
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// Decrement cached DSP for the items we're pushing back
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f.instruction(&Instruction::LocalGet(CACHED_DSP_LOCAL));
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f.instruction(&Instruction::I32Const((remaining * CELL_SIZE) as i32));
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f.instruction(&Instruction::I32Sub);
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f.instruction(&Instruction::LocalSet(CACHED_DSP_LOCAL));
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// Store items: top of sim stack (last in vec) goes to [dsp],
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// next goes to [dsp+4], etc.
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for i in 0..remaining {
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let local = sim.stack[(remaining - 1 - i) as usize]; // top first
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f.instruction(&Instruction::LocalGet(CACHED_DSP_LOCAL));
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if i > 0 {
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f.instruction(&Instruction::I32Const((i * CELL_SIZE) as i32));
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f.instruction(&Instruction::I32Add);
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}
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f.instruction(&Instruction::LocalGet(local));
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f.instruction(&Instruction::I32Store(MEM4));
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}
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}
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}
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/// Emit a single promoted IR operation using WASM locals instead of memory.
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///
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/// Stack manipulation ops (Swap, Rot, Dup, Drop, Over, Nip, Tuck) emit zero
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/// WASM instructions -- they just rearrange the simulator's local references.
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/// Arithmetic and memory ops use `local.get` / `local.set` instead of
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/// load/store through the data stack pointer.
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fn emit_promoted_op(f: &mut Function, op: &IrOp, sim: &mut StackSim) {
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match op {
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// -- Literals --
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IrOp::PushI32(n) => {
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let local = sim.alloc();
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f.instruction(&Instruction::I32Const(*n));
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f.instruction(&Instruction::LocalSet(local));
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sim.push(local);
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}
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// -- Stack manipulation: zero WASM instructions! --
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IrOp::Drop => {
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sim.pop();
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}
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IrOp::Dup => {
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let top = sim.peek();
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sim.push(top); // same local, aliased
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}
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IrOp::Swap => {
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sim.swap();
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}
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IrOp::Over => {
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let second = sim.peek_at(1);
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sim.push(second);
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}
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IrOp::Rot => {
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sim.rot();
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}
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IrOp::Nip => {
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// ( a b -- b ) : remove second
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let top = sim.pop();
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sim.pop(); // discard second
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sim.push(top);
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}
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IrOp::Tuck => {
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// ( a b -- b a b ) : insert top below second
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let b = sim.pop();
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let a = sim.pop();
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sim.push(b);
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sim.push(a);
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sim.push(b); // aliased, same local
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}
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IrOp::TwoDup => {
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let b = sim.peek_at(0);
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let a = sim.peek_at(1);
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sim.push(a);
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sim.push(b);
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}
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IrOp::TwoDrop => {
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sim.pop();
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sim.pop();
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}
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// -- Binary arithmetic (commutative) --
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IrOp::Add => emit_promoted_binary(f, sim, &Instruction::I32Add),
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IrOp::Mul => emit_promoted_binary(f, sim, &Instruction::I32Mul),
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IrOp::And => emit_promoted_binary(f, sim, &Instruction::I32And),
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IrOp::Or => emit_promoted_binary(f, sim, &Instruction::I32Or),
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IrOp::Xor => emit_promoted_binary(f, sim, &Instruction::I32Xor),
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// -- Binary arithmetic (ordered: a OP b) --
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IrOp::Sub => emit_promoted_binary_ordered(f, sim, &Instruction::I32Sub),
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IrOp::Lshift => emit_promoted_binary_ordered(f, sim, &Instruction::I32Shl),
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IrOp::Rshift => emit_promoted_binary_ordered(f, sim, &Instruction::I32ShrU),
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IrOp::ArithRshift => emit_promoted_binary_ordered(f, sim, &Instruction::I32ShrS),
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// -- Comparisons --
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IrOp::Eq => emit_promoted_cmp(f, sim, &Instruction::I32Eq),
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IrOp::NotEq => emit_promoted_cmp(f, sim, &Instruction::I32Ne),
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IrOp::Lt => emit_promoted_cmp(f, sim, &Instruction::I32LtS),
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IrOp::Gt => emit_promoted_cmp(f, sim, &Instruction::I32GtS),
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IrOp::LtUnsigned => emit_promoted_cmp(f, sim, &Instruction::I32LtU),
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IrOp::ZeroEq => {
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let a = sim.pop();
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let result = sim.alloc();
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f.instruction(&Instruction::LocalGet(a));
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f.instruction(&Instruction::I32Eqz);
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// Convert WASM bool to Forth flag: 0 - result
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f.instruction(&Instruction::LocalSet(result));
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f.instruction(&Instruction::I32Const(0));
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f.instruction(&Instruction::LocalGet(result));
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f.instruction(&Instruction::I32Sub);
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f.instruction(&Instruction::LocalSet(result));
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sim.push(result);
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}
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IrOp::ZeroLt => {
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let a = sim.pop();
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let result = sim.alloc();
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f.instruction(&Instruction::LocalGet(a));
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f.instruction(&Instruction::I32Const(0));
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f.instruction(&Instruction::I32LtS);
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// Convert WASM bool to Forth flag
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f.instruction(&Instruction::LocalSet(result));
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f.instruction(&Instruction::I32Const(0));
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f.instruction(&Instruction::LocalGet(result));
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f.instruction(&Instruction::I32Sub);
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f.instruction(&Instruction::LocalSet(result));
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sim.push(result);
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}
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// -- Unary arithmetic --
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IrOp::Negate => {
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let a = sim.pop();
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let result = sim.alloc();
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f.instruction(&Instruction::I32Const(0));
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f.instruction(&Instruction::LocalGet(a));
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f.instruction(&Instruction::I32Sub);
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f.instruction(&Instruction::LocalSet(result));
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sim.push(result);
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}
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IrOp::Abs => {
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let a = sim.pop();
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let result = sim.alloc();
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// Copy input to result, then negate if negative
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f.instruction(&Instruction::LocalGet(a));
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f.instruction(&Instruction::LocalSet(result));
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f.instruction(&Instruction::LocalGet(result));
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f.instruction(&Instruction::I32Const(0));
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f.instruction(&Instruction::I32LtS);
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f.instruction(&Instruction::If(BlockType::Empty));
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f.instruction(&Instruction::I32Const(0));
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f.instruction(&Instruction::LocalGet(result));
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f.instruction(&Instruction::I32Sub);
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f.instruction(&Instruction::LocalSet(result));
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f.instruction(&Instruction::End);
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sim.push(result);
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}
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IrOp::Invert => {
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let a = sim.pop();
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let result = sim.alloc();
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f.instruction(&Instruction::I32Const(-1));
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f.instruction(&Instruction::LocalGet(a));
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f.instruction(&Instruction::I32Xor);
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f.instruction(&Instruction::LocalSet(result));
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sim.push(result);
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}
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// -- DivMod: ( n1 n2 -- rem quot ) --
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IrOp::DivMod => {
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let n2 = sim.pop();
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let n1 = sim.pop();
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let rem_local = sim.alloc();
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let quot_local = sim.alloc();
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// remainder
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f.instruction(&Instruction::LocalGet(n1));
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f.instruction(&Instruction::LocalGet(n2));
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f.instruction(&Instruction::I32RemS);
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f.instruction(&Instruction::LocalSet(rem_local));
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// quotient
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||||
f.instruction(&Instruction::LocalGet(n1));
|
||||
f.instruction(&Instruction::LocalGet(n2));
|
||||
f.instruction(&Instruction::I32DivS);
|
||||
f.instruction(&Instruction::LocalSet(quot_local));
|
||||
sim.push(rem_local);
|
||||
sim.push(quot_local);
|
||||
}
|
||||
|
||||
// -- Memory operations: these still access linear memory --
|
||||
IrOp::Fetch => {
|
||||
let addr = sim.pop();
|
||||
let result = sim.alloc();
|
||||
f.instruction(&Instruction::LocalGet(addr));
|
||||
f.instruction(&Instruction::I32Load(MEM4));
|
||||
f.instruction(&Instruction::LocalSet(result));
|
||||
sim.push(result);
|
||||
}
|
||||
IrOp::CFetch => {
|
||||
let addr = sim.pop();
|
||||
let result = sim.alloc();
|
||||
f.instruction(&Instruction::LocalGet(addr));
|
||||
f.instruction(&Instruction::I32Load8U(MEM1));
|
||||
f.instruction(&Instruction::LocalSet(result));
|
||||
sim.push(result);
|
||||
}
|
||||
IrOp::Store => {
|
||||
// ( x addr -- )
|
||||
let addr = sim.pop();
|
||||
let x = sim.pop();
|
||||
f.instruction(&Instruction::LocalGet(addr));
|
||||
f.instruction(&Instruction::LocalGet(x));
|
||||
f.instruction(&Instruction::I32Store(MEM4));
|
||||
}
|
||||
IrOp::CStore => {
|
||||
let addr = sim.pop();
|
||||
let ch = sim.pop();
|
||||
f.instruction(&Instruction::LocalGet(addr));
|
||||
f.instruction(&Instruction::LocalGet(ch));
|
||||
f.instruction(&Instruction::I32Store8(MEM1));
|
||||
}
|
||||
IrOp::PlusStore => {
|
||||
// ( n addr -- ) : mem[addr] += n
|
||||
let addr = sim.pop();
|
||||
let n = sim.pop();
|
||||
f.instruction(&Instruction::LocalGet(addr));
|
||||
f.instruction(&Instruction::LocalGet(addr));
|
||||
f.instruction(&Instruction::I32Load(MEM4));
|
||||
f.instruction(&Instruction::LocalGet(n));
|
||||
f.instruction(&Instruction::I32Add);
|
||||
f.instruction(&Instruction::I32Store(MEM4));
|
||||
}
|
||||
|
||||
// These should not appear in promotable code (caught by is_promotable),
|
||||
// but handle gracefully by falling back to emit_op.
|
||||
_ => {}
|
||||
}
|
||||
}
|
||||
|
||||
/// Emit a promoted binary operation (commutative).
|
||||
fn emit_promoted_binary(f: &mut Function, sim: &mut StackSim, op: &Instruction<'_>) {
|
||||
let b = sim.pop();
|
||||
let a = sim.pop();
|
||||
let result = sim.alloc();
|
||||
f.instruction(&Instruction::LocalGet(a));
|
||||
f.instruction(&Instruction::LocalGet(b));
|
||||
f.instruction(op);
|
||||
f.instruction(&Instruction::LocalSet(result));
|
||||
sim.push(result);
|
||||
}
|
||||
|
||||
/// Emit a promoted binary operation (ordered: a OP b).
|
||||
fn emit_promoted_binary_ordered(f: &mut Function, sim: &mut StackSim, op: &Instruction<'_>) {
|
||||
let b = sim.pop();
|
||||
let a = sim.pop();
|
||||
let result = sim.alloc();
|
||||
f.instruction(&Instruction::LocalGet(a));
|
||||
f.instruction(&Instruction::LocalGet(b));
|
||||
f.instruction(op);
|
||||
f.instruction(&Instruction::LocalSet(result));
|
||||
sim.push(result);
|
||||
}
|
||||
|
||||
/// Emit a promoted comparison operation (a CMP b, result is Forth flag).
|
||||
fn emit_promoted_cmp(f: &mut Function, sim: &mut StackSim, cmp: &Instruction<'_>) {
|
||||
let b = sim.pop();
|
||||
let a = sim.pop();
|
||||
let result = sim.alloc();
|
||||
f.instruction(&Instruction::LocalGet(a));
|
||||
f.instruction(&Instruction::LocalGet(b));
|
||||
f.instruction(cmp);
|
||||
// Convert WASM bool (0/1) to Forth flag (0/-1): 0 - wasm_bool
|
||||
f.instruction(&Instruction::LocalSet(result));
|
||||
f.instruction(&Instruction::I32Const(0));
|
||||
f.instruction(&Instruction::LocalGet(result));
|
||||
f.instruction(&Instruction::I32Sub);
|
||||
f.instruction(&Instruction::LocalSet(result));
|
||||
sim.push(result);
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Public API
|
||||
// ---------------------------------------------------------------------------
|
||||
@@ -923,15 +1456,35 @@ pub fn compile_word(
|
||||
module.section(&elements);
|
||||
|
||||
// -- Code section --
|
||||
// Total locals = 1 (cached DSP at index 0) + scratch locals (at SCRATCH_BASE..)
|
||||
let num_locals = 1 + count_scratch_locals(body);
|
||||
// Determine whether to use stack-to-local promotion
|
||||
let promoted = is_promotable(body);
|
||||
let scratch_count = count_scratch_locals(body);
|
||||
let num_locals = if promoted {
|
||||
let (preload, _) = compute_stack_needs(body);
|
||||
let promoted_count = count_promoted_locals(body, preload);
|
||||
// 1 (cached DSP) + promoted locals (scratch locals not needed in promoted path)
|
||||
1 + promoted_count
|
||||
} else {
|
||||
1 + scratch_count
|
||||
};
|
||||
let mut func = Function::new(vec![(num_locals, ValType::I32)]);
|
||||
|
||||
// Prologue: cache $dsp global into local 0
|
||||
func.instruction(&Instruction::GlobalGet(DSP))
|
||||
.instruction(&Instruction::LocalSet(CACHED_DSP_LOCAL));
|
||||
|
||||
emit_body(&mut func, body);
|
||||
if promoted {
|
||||
let (preload, _) = compute_stack_needs(body);
|
||||
let first_promoted = SCRATCH_BASE; // promoted locals start right after cached_dsp
|
||||
let mut sim = StackSim::new(first_promoted);
|
||||
emit_promoted_prologue(&mut func, preload, &mut sim);
|
||||
for op in body {
|
||||
emit_promoted_op(&mut func, op, &mut sim);
|
||||
}
|
||||
emit_promoted_epilogue(&mut func, &mut sim);
|
||||
} else {
|
||||
emit_body(&mut func, body);
|
||||
}
|
||||
|
||||
// Epilogue: write cached DSP back to the $dsp global
|
||||
func.instruction(&Instruction::LocalGet(CACHED_DSP_LOCAL))
|
||||
@@ -1989,4 +2542,214 @@ mod tests {
|
||||
];
|
||||
assert_eq!(run_word(&ops), vec![14]);
|
||||
}
|
||||
|
||||
// ===================================================================
|
||||
// Stack-to-local promotion tests
|
||||
// ===================================================================
|
||||
|
||||
#[test]
|
||||
fn promotable_pure_arithmetic() {
|
||||
assert!(is_promotable(&[IrOp::Dup, IrOp::Mul]));
|
||||
assert!(is_promotable(&[IrOp::PushI32(1), IrOp::Add]));
|
||||
assert!(is_promotable(&[IrOp::Swap, IrOp::Over, IrOp::Nip]));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn not_promotable_with_calls() {
|
||||
assert!(!is_promotable(&[IrOp::Call(WordId(5))]));
|
||||
assert!(!is_promotable(&[IrOp::Emit]));
|
||||
assert!(!is_promotable(&[IrOp::ToR]));
|
||||
assert!(!is_promotable(&[IrOp::If {
|
||||
then_body: vec![],
|
||||
else_body: None,
|
||||
}]));
|
||||
assert!(!is_promotable(&[]));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn compute_stack_needs_dup_mul() {
|
||||
// DUP * : reads 1 item from caller, net change = 0 (1 in, 1 out via dup*mul)
|
||||
let (preload, net) = compute_stack_needs(&[IrOp::Dup, IrOp::Mul]);
|
||||
assert_eq!(preload, 1);
|
||||
assert_eq!(net, 0);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn compute_stack_needs_push_add() {
|
||||
// PushI32(1) Add: needs 1 item from caller (Add consumes 2, push provides 1)
|
||||
let (preload, net) = compute_stack_needs(&[IrOp::PushI32(1), IrOp::Add]);
|
||||
assert_eq!(preload, 1); // Add reads depth-2 = -1 when depth=1 after push
|
||||
assert_eq!(net, 0);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn compute_stack_needs_swap() {
|
||||
// SWAP: reads 2 items, net = 0
|
||||
let (preload, net) = compute_stack_needs(&[IrOp::Swap]);
|
||||
assert_eq!(preload, 2);
|
||||
assert_eq!(net, 0);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_dup_mul_executes() {
|
||||
// SQUARE = DUP * (promotable: preload 1 item, no memory stack ops)
|
||||
let ops = vec![IrOp::PushI32(7), IrOp::Dup, IrOp::Mul];
|
||||
assert_eq!(run_word(&ops), vec![49]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_swap_executes() {
|
||||
// Swap two items using promoted path (zero WASM instructions for swap)
|
||||
let ops = vec![IrOp::PushI32(1), IrOp::PushI32(2), IrOp::Swap];
|
||||
assert_eq!(run_word(&ops), vec![1, 2]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_over_add_executes() {
|
||||
// OVER OVER + : promoted, reads 2 items, pushes 1 extra
|
||||
let ops = vec![
|
||||
IrOp::PushI32(3),
|
||||
IrOp::PushI32(4),
|
||||
IrOp::Over,
|
||||
IrOp::Over,
|
||||
IrOp::Add,
|
||||
];
|
||||
assert_eq!(run_word(&ops), vec![7, 4, 3]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_nip_executes() {
|
||||
let ops = vec![IrOp::PushI32(10), IrOp::PushI32(20), IrOp::Nip];
|
||||
assert_eq!(run_word(&ops), vec![20]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_rot_executes() {
|
||||
let ops = vec![
|
||||
IrOp::PushI32(1),
|
||||
IrOp::PushI32(2),
|
||||
IrOp::PushI32(3),
|
||||
IrOp::Rot,
|
||||
];
|
||||
assert_eq!(run_word(&ops), vec![1, 3, 2]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_comparison_executes() {
|
||||
let ops = vec![IrOp::PushI32(5), IrOp::PushI32(5), IrOp::Eq];
|
||||
assert_eq!(run_word(&ops), vec![-1]);
|
||||
let ops = vec![IrOp::PushI32(3), IrOp::PushI32(5), IrOp::Lt];
|
||||
assert_eq!(run_word(&ops), vec![-1]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_memory_fetch_store_executes() {
|
||||
let ops = vec![
|
||||
IrOp::PushI32(42),
|
||||
IrOp::PushI32(0x100),
|
||||
IrOp::Store,
|
||||
IrOp::PushI32(0x100),
|
||||
IrOp::Fetch,
|
||||
];
|
||||
assert_eq!(run_word(&ops), vec![42]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_divmod_executes() {
|
||||
// ( 10 3 -- rem quot ) => top-first: [3, 1]
|
||||
let ops = vec![IrOp::PushI32(10), IrOp::PushI32(3), IrOp::DivMod];
|
||||
assert_eq!(run_word(&ops), vec![3, 1]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_tuck_executes() {
|
||||
// ( 1 2 -- 2 1 2 )
|
||||
let ops = vec![IrOp::PushI32(1), IrOp::PushI32(2), IrOp::Tuck];
|
||||
assert_eq!(run_word(&ops), vec![2, 1, 2]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_two_dup_executes() {
|
||||
let ops = vec![IrOp::PushI32(3), IrOp::PushI32(4), IrOp::TwoDup];
|
||||
assert_eq!(run_word(&ops), vec![4, 3, 4, 3]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_two_drop_executes() {
|
||||
let ops = vec![
|
||||
IrOp::PushI32(1),
|
||||
IrOp::PushI32(2),
|
||||
IrOp::PushI32(3),
|
||||
IrOp::TwoDrop,
|
||||
];
|
||||
assert_eq!(run_word(&ops), vec![1]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_negate_abs_invert_executes() {
|
||||
assert_eq!(run_word(&[IrOp::PushI32(5), IrOp::Negate]), vec![-5]);
|
||||
assert_eq!(run_word(&[IrOp::PushI32(-42), IrOp::Abs]), vec![42]);
|
||||
assert_eq!(run_word(&[IrOp::PushI32(0), IrOp::Invert]), vec![-1]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_zero_eq_zero_lt_executes() {
|
||||
assert_eq!(run_word(&[IrOp::PushI32(0), IrOp::ZeroEq]), vec![-1]);
|
||||
assert_eq!(run_word(&[IrOp::PushI32(5), IrOp::ZeroEq]), vec![0]);
|
||||
assert_eq!(run_word(&[IrOp::PushI32(-1), IrOp::ZeroLt]), vec![-1]);
|
||||
assert_eq!(run_word(&[IrOp::PushI32(0), IrOp::ZeroLt]), vec![0]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_shift_executes() {
|
||||
assert_eq!(
|
||||
run_word(&[IrOp::PushI32(1), IrOp::PushI32(4), IrOp::Lshift]),
|
||||
vec![16]
|
||||
);
|
||||
assert_eq!(
|
||||
run_word(&[IrOp::PushI32(16), IrOp::PushI32(2), IrOp::Rshift]),
|
||||
vec![4]
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_plus_store_executes() {
|
||||
let ops = vec![
|
||||
IrOp::PushI32(10),
|
||||
IrOp::PushI32(0x100),
|
||||
IrOp::Store,
|
||||
IrOp::PushI32(5),
|
||||
IrOp::PushI32(0x100),
|
||||
IrOp::PlusStore,
|
||||
IrOp::PushI32(0x100),
|
||||
IrOp::Fetch,
|
||||
];
|
||||
assert_eq!(run_word(&ops), vec![15]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn promoted_cfetch_cstore_executes() {
|
||||
let ops = vec![
|
||||
IrOp::PushI32(65),
|
||||
IrOp::PushI32(0x200),
|
||||
IrOp::CStore,
|
||||
IrOp::PushI32(0x200),
|
||||
IrOp::CFetch,
|
||||
];
|
||||
assert_eq!(run_word(&ops), vec![65]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn non_promotable_still_works() {
|
||||
// Words with control flow should NOT be promoted, but should still work
|
||||
let ops = vec![
|
||||
IrOp::PushI32(-1),
|
||||
IrOp::If {
|
||||
then_body: vec![IrOp::PushI32(42)],
|
||||
else_body: Some(vec![IrOp::PushI32(0)]),
|
||||
},
|
||||
];
|
||||
assert!(!is_promotable(&ops));
|
||||
assert_eq!(run_word(&ops), vec![42]);
|
||||
}
|
||||
}
|
||||
|
||||
@@ -415,17 +415,19 @@ fn inline(ops: Vec<IrOp>, bodies: &HashMap<WordId, Vec<IrOp>>, max_size: usize)
|
||||
match &op {
|
||||
IrOp::Call(id) => {
|
||||
if let Some(body) = bodies.get(id)
|
||||
&& body.len() <= max_size && !contains_call_to(body, *id) {
|
||||
// Inline the body, converting TailCall back to Call
|
||||
// (tail position in the callee is not tail position in the caller)
|
||||
for inlined_op in body {
|
||||
match inlined_op {
|
||||
IrOp::TailCall(tid) => out.push(IrOp::Call(*tid)),
|
||||
other => out.push(other.clone()),
|
||||
}
|
||||
&& body.len() <= max_size
|
||||
&& !contains_call_to(body, *id)
|
||||
{
|
||||
// Inline the body, converting TailCall back to Call
|
||||
// (tail position in the callee is not tail position in the caller)
|
||||
for inlined_op in body {
|
||||
match inlined_op {
|
||||
IrOp::TailCall(tid) => out.push(IrOp::Call(*tid)),
|
||||
other => out.push(other.clone()),
|
||||
}
|
||||
continue;
|
||||
}
|
||||
continue;
|
||||
}
|
||||
out.push(op);
|
||||
}
|
||||
_ => {
|
||||
@@ -451,9 +453,10 @@ fn contains_call_to(ops: &[IrOp], target: WordId) -> bool {
|
||||
return true;
|
||||
}
|
||||
if let Some(eb) = else_body
|
||||
&& contains_call_to(eb, target) {
|
||||
return true;
|
||||
}
|
||||
&& contains_call_to(eb, target)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
}
|
||||
IrOp::DoLoop { body, .. } | IrOp::BeginUntil { body } | IrOp::BeginAgain { body } => {
|
||||
if contains_call_to(body, target) {
|
||||
@@ -480,9 +483,10 @@ fn contains_call_to(ops: &[IrOp], target: WordId) -> bool {
|
||||
return true;
|
||||
}
|
||||
if let Some(eb) = else_body
|
||||
&& contains_call_to(eb, target) {
|
||||
return true;
|
||||
}
|
||||
&& contains_call_to(eb, target)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
}
|
||||
_ => {}
|
||||
}
|
||||
|
||||
+110
-1
@@ -7393,7 +7393,8 @@ impl ForthVM {
|
||||
|
||||
let flag: i32 = if result { -1 } else { 0 };
|
||||
let dsp_val = dsp.get(&mut caller).unwrap_i32() as u32;
|
||||
let new_dsp = dsp_val - CELL_SIZE;
|
||||
let new_dsp = dsp_val.checked_sub(CELL_SIZE)
|
||||
.ok_or_else(|| wasmtime::Error::msg("data stack overflow in F~"))?;
|
||||
dsp.set(&mut caller, Val::I32(new_dsp as i32)).unwrap();
|
||||
let mem = memory.data_mut(&mut caller);
|
||||
mem[new_dsp as usize..new_dsp as usize + 4]
|
||||
@@ -10261,4 +10262,112 @@ mod tests {
|
||||
vec![0]
|
||||
);
|
||||
}
|
||||
|
||||
// ===================================================================
|
||||
// End-to-end optimization verification tests
|
||||
// ===================================================================
|
||||
|
||||
#[test]
|
||||
fn verify_peephole_active() {
|
||||
// PushI32(0) + Add should be removed by peephole
|
||||
assert_eq!(eval_stack(": T 0 + ; 5 T"), vec![5]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_constant_folding_active() {
|
||||
// 3 4 + should fold to 7 at compile time
|
||||
assert_eq!(eval_stack(": T 3 4 + ; T"), vec![7]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_strength_reduction_active() {
|
||||
// 4 * should become 2 LSHIFT
|
||||
assert_eq!(eval_stack(": T 4 * ; 3 T"), vec![12]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_dce_active() {
|
||||
// Code after EXIT should be eliminated
|
||||
assert_eq!(eval_stack(": T 42 EXIT 99 ; T"), vec![42]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_tail_call_active() {
|
||||
// Recursive word in tail position should work (tail call prevents stack overflow)
|
||||
assert_eq!(
|
||||
eval_stack(": DEC1 DUP 0= IF EXIT THEN 1- RECURSE ; 1000 DEC1"),
|
||||
vec![0],
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_inlining_active() {
|
||||
// Small word should be inlined: 5 + 3 should fold to 8 after inline + fold
|
||||
assert_eq!(eval_stack(": ADD3 3 + ; : T ADD3 ; 5 T"), vec![8]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_compound_ops_active() {
|
||||
// 2DUP (Over Over -> TwoDup) should work
|
||||
assert_eq!(eval_stack(": T 2DUP + ; 3 4 T"), vec![7, 4, 3]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_dsp_caching_active() {
|
||||
// Complex word should work with DSP caching
|
||||
assert_eq!(
|
||||
eval_stack(": FACT DUP 1 > IF DUP 1- RECURSE * ELSE DROP 1 THEN ; 5 FACT"),
|
||||
vec![120],
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_consolidation_active() {
|
||||
assert_eq!(
|
||||
eval_stack(": A 10 ; : B 20 ; : C A B + ; CONSOLIDATE C"),
|
||||
vec![30],
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_stack_promotion_square() {
|
||||
// DUP * is promotable (no control flow, no calls) -- should use locals
|
||||
assert_eq!(eval_stack(": SQUARE DUP * ; 7 SQUARE"), vec![49]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_stack_promotion_arithmetic() {
|
||||
// Pure arithmetic promotion
|
||||
assert_eq!(eval_stack(": T OVER OVER + ; 3 4 T"), vec![7, 4, 3]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_stack_promotion_swap() {
|
||||
// SWAP is a zero-instruction op in promoted path
|
||||
assert_eq!(eval_stack(": T SWAP ; 1 2 T"), vec![1, 2]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_stack_promotion_rot() {
|
||||
// ROT is a zero-instruction op in promoted path
|
||||
assert_eq!(eval_stack(": T ROT ; 1 2 3 T"), vec![1, 3, 2]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_stack_promotion_nip_tuck() {
|
||||
assert_eq!(eval_stack(": T NIP ; 1 2 T"), vec![2]);
|
||||
assert_eq!(eval_stack(": T TUCK ; 1 2 T"), vec![2, 1, 2]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_stack_promotion_memory_ops() {
|
||||
// Memory fetch/store should work in promoted path
|
||||
assert_eq!(eval_stack("VARIABLE X 42 X ! : T X @ 10 + ; T"), vec![52],);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn verify_stack_promotion_comparison() {
|
||||
assert_eq!(eval_stack(": T = ; 5 5 T"), vec![-1]);
|
||||
assert_eq!(eval_stack(": T < ; 3 5 T"), vec![-1]);
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user