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| author | Richard Eisenberg <rae@richarde.dev> | 2020-09-15 15:20:43 -0400 |
|---|---|---|
| committer | Richard Eisenberg <rae@richarde.dev> | 2020-09-15 18:05:50 -0400 |
| commit | 9cc826502c0fb811006185d92db7671d0d2c8a12 (patch) | |
| tree | 3f1a66520f4da7d1d0a3340b8ba6737b2753bf57 | |
| parent | 07762eb5cfe735e131a7f017939a6b0ccfb28389 (diff) | |
| download | haskell-wip/doc-iface-tuple-ty.tar.gz | |
Document IfaceTupleTywip/doc-iface-tuple-ty
| -rw-r--r-- | compiler/GHC/Iface/Type.hs | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/compiler/GHC/Iface/Type.hs b/compiler/GHC/Iface/Type.hs index 57c31920b4..73ce53e34d 100644 --- a/compiler/GHC/Iface/Type.hs +++ b/compiler/GHC/Iface/Type.hs @@ -176,6 +176,11 @@ data IfaceType PromotionFlag -- A bit like IfaceTyCon IfaceAppArgs -- arity = length args -- For promoted data cons, the kind args are omitted + -- Why have this? Only for efficiency: IfaceTupleTy can omit the + -- type arguments, as they can be recreated when deserializing. + -- In an experiment, removing IfaceTupleTy resulted in a 0.75% regression + -- in interface file size (in GHC's boot libraries). + -- See !3987. type IfaceMult = IfaceType |