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EbbHeaderBlockData::predecessors: use SmallVec instead of Vec

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Allocations associated with pushes to EbbHeaderBlockData::predecessors account
for 4.9% of all heap allocation (calls) in CL.  This change avoids almost all
of them by changing it to be a SmallVec<[PredBlock; 4]>.  Dynamic instruction
count falls by 0.15%.
This commit is contained in:
Julian Seward
2019-09-07 19:12:42 +02:00
committed by Benjamin Bouvier
parent 955cdd5f83
commit c6a4c60a0f
2 changed files with 9 additions and 4 deletions
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cranelift/frontend/Cargo.toml
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@@ -15,6 +15,7 @@ cranelift-codegen = { path = "../cranelift-codegen", version = "0.42.0", default
target-lexicon = "0.8.1"
log = { version = "0.4.6", default-features = false }
hashmap_core = { version = "0.1.9", optional = true }
smallvec = { version = "0.6.10" }
[features]
default = ["std"]