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trying a little bit of preemptive optimization

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This commit is contained in:
Devyn Cairns 2024-06-12 02:47:01 -07:00
parent 1c7a6fc43c
commit 352095a3b8
1 changed files with 9 additions and 8 deletions
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15
crates/nu-engine/src/eval_ir.rs
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@ -23,17 +23,18 @@ pub fn eval_ir_block<D: DebugContext>(
// //
// Keep in mind that there is some code generated for each variant; at least at the moment // Keep in mind that there is some code generated for each variant; at least at the moment
// it doesn't seem like LLVM is able to optimize this away // it doesn't seem like LLVM is able to optimize this away
let result = match ir_block.register_count { //
0..=4 => { // This is organized like a tree to try to make sure we do the fewest number of branches
let result = if ir_block.register_count <= 8 {
if ir_block.register_count <= 4 {
eval_ir_block_static::<D, 4>(engine_state, stack, &block_span, ir_block, input) eval_ir_block_static::<D, 4>(engine_state, stack, &block_span, ir_block, input)
} } else {
5..=8 => {
eval_ir_block_static::<D, 8>(engine_state, stack, &block_span, ir_block, input) eval_ir_block_static::<D, 8>(engine_state, stack, &block_span, ir_block, input)
} }
9..=16 => { } else if ir_block.register_count <= 16 {
eval_ir_block_static::<D, 16>(engine_state, stack, &block_span, ir_block, input) eval_ir_block_static::<D, 16>(engine_state, stack, &block_span, ir_block, input)
} } else {
_ => eval_ir_block_dynamic::<D>(engine_state, stack, &block_span, ir_block, input), eval_ir_block_dynamic::<D>(engine_state, stack, &block_span, ir_block, input)
}; };
D::leave_block(engine_state, block); D::leave_block(engine_state, block);