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Optimize unpack, str.__add__ and fastlocals #7293

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Merged
youknowone merged 9 commits into from
Mar 2, 2026
Merged

Optimize unpack, str.__add__ and fastlocals #7293

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ef3c5ef
Remove intermediate Vec allocation in unpack_sequence fast path
youknowone Mar 1, 2026
b6760e1
Use read-only atomic load before swap in check_signals
youknowone Mar 1, 2026
98ea46e
Cache builtins downcast in ExecutingFrame for LOAD_GLOBAL
youknowone Mar 1, 2026
f3a8d8d
Add number Add slot to PyStr for direct str+str dispatch
youknowone Mar 1, 2026
67ed603
Guard FastLocals access in locals() with try_lock on state mutex
youknowone Mar 1, 2026
b1cf47c
Use exact type check for builtins_dict cache
youknowone Mar 1, 2026
0af466c
Consolidate with_recursion in _cmp to single guard
youknowone Mar 1, 2026
5b9e078
Add opcode-level fast paths for FOR_ITER, COMPARE_OP, BINARY_OP
youknowone Mar 1, 2026
4c24868
Also check globals is exact dict for LOAD_GLOBAL fast path
youknowone Mar 1, 2026
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Use read-only atomic load before swap in check_signals 
Add Relaxed load guard before the Acquire swap to avoid cache-line
invalidation on every instruction dispatch when no signal is pending.
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@youknowone
youknowone committed Mar 1, 2026
commit b6760e169a002f4d096d07c08f1c2219549e2b14
6 changes: 6 additions & 0 deletions crates/vm/src/signal.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,12 @@ pub fn check_signals(vm: &VirtualMachine) -> PyResult<()> {
return Ok(());
}

// Read-only check first: avoids cache-line invalidation on every
// instruction when no signal is pending (the common case).
if !ANY_TRIGGERED.load(Ordering::Relaxed) {
return Ok(());
}
// Atomic RMW only when a signal is actually pending.
if !ANY_TRIGGERED.swap(false, Ordering::Acquire) {
return Ok(());
}
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