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Diffstat (limited to 'compiler/GHC/Driver/Config/StgToCmm.hs')
| -rw-r--r-- | compiler/GHC/Driver/Config/StgToCmm.hs | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/compiler/GHC/Driver/Config/StgToCmm.hs b/compiler/GHC/Driver/Config/StgToCmm.hs index 1ac590cef0..d82187e036 100644 --- a/compiler/GHC/Driver/Config/StgToCmm.hs +++ b/compiler/GHC/Driver/Config/StgToCmm.hs @@ -1,10 +1,11 @@ module GHC.Driver.Config.StgToCmm ( initStgToCmmConfig + , PrimitiveImplementation(..) ) where import GHC.StgToCmm.Config -import GHC.Driver.Backend +import GHC.Driver.Backend.Types import GHC.Driver.Session import GHC.Platform import GHC.Platform.Profile @@ -80,3 +81,24 @@ initStgToCmmConfig dflags mod = StgToCmmConfig binBlobThreshold dflags else 0 -- suppress them entirely + + + +-- | This enumeration type specifies how the back end wishes GHC's +-- primitives to be implemented. (Module "GHC.StgToCmm.Prim" provides +-- a generic implementation of every primitive, but some primitives, +-- like `IntQuotRemOp`, can be implemented more efficiently by +-- certain back ends on certain platforms. For example, by using a +-- machine instruction that simultaneously computes quotient and remainder.) +-- +-- For the meaning of each alternative, consult +-- "GHC.Driver.Config.StgToCmm". (In a perfect world, type +-- `PrimitiveImplementation` would be defined there, in the module +-- that determines its meaning. But I could not figure out how to do +-- it without mutual recursion across module boundaries.) + +data PrimitiveImplementation + = LlvmPrimitives + | NcgPrimitives + | GenericPrimitives + deriving Show |