diff options
| -rw-r--r-- | compiler/coreSyn/CoreSubst.lhs | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/compiler/coreSyn/CoreSubst.lhs b/compiler/coreSyn/CoreSubst.lhs index 3fe48009a8..3224cc2763 100644 --- a/compiler/coreSyn/CoreSubst.lhs +++ b/compiler/coreSyn/CoreSubst.lhs @@ -48,6 +48,7 @@ import IdInfo import Unique import UniqSupply import Maybes +import BasicTypes ( isAlwaysActive ) import Outputable import PprCore () -- Instances import FastString @@ -667,6 +668,7 @@ simpleOptExpr expr | isId b -- let x = e in <body> , safe_to_inline (idOccInfo b) || exprIsTrivial r' + , isAlwaysActive (idInlineActivation b) -- Note [Inline prag in simplOpt] = Left (extendIdSubst subst b r') | otherwise @@ -682,3 +684,22 @@ simpleOptExpr expr safe_to_inline (IAmALoopBreaker {}) = False safe_to_inline NoOccInfo = False \end{code} + +Note [Inline prag in simplOpt] +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +If there's an INLINE/NOINLINE pragma that restricts the phase in +which the binder can be inlined, we don't inline here; after all, +we don't know what phase we're in. Here's an example + + foo :: Int -> Int -> Int + {-# INLINE foo #-} + foo m n = inner m + where + {-# INLINE [1] inner #-} + inner m = m+n + + bar :: Int -> Int + bar n = foo n 1 + +When inlining 'foo' in 'bar' we want the let-binding for 'inner' +to remain visible until Phase 1
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