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Diffstat (limited to 'compiler/GHC/Core/Opt/Arity.hs')
| -rw-r--r-- | compiler/GHC/Core/Opt/Arity.hs | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/GHC/Core/Opt/Arity.hs b/compiler/GHC/Core/Opt/Arity.hs index 832fba354c..5ed015281a 100644 --- a/compiler/GHC/Core/Opt/Arity.hs +++ b/compiler/GHC/Core/Opt/Arity.hs @@ -132,6 +132,9 @@ joinRhsArity :: CoreExpr -> JoinArity -- Join points are supposed to have manifestly-visible -- lambdas at the top: no ticks, no casts, nothing -- Moreover, type lambdas count in JoinArity +-- NB: For non-recursive bindings, the join arity of the binding may actually be +-- less that the number of manifestly-visible lambdas. +-- See Note [Join arity prediction based on joinRhsArity] in GHC.Core.Opt.OccurAnal joinRhsArity (Lam _ e) = 1 + joinRhsArity e joinRhsArity _ = 0 |