ghc-7.6.1.20121122: The GHC API

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CmmMachOp

Synopsis

Documentation

data MachOp Source

Machine-level primops; ones which we can reasonably delegate to the native code generators to handle.

Most operations are parameterised by the Width that they operate on. Some operations have separate signed and unsigned versions, and float and integer versions.

Instances

isCommutableMachOp :: MachOp -> BoolSource

Returns True if the MachOp has commutable arguments. This is used in the platform-independent Cmm optimisations.

If in doubt, return False. This generates worse code on the native routes, but is otherwise harmless.

isAssociativeMachOp :: MachOp -> BoolSource

Returns True if the MachOp is associative (i.e. (x+y)+z == x+(y+z)) This is used in the platform-independent Cmm optimisations.

If in doubt, return False. This generates worse code on the native routes, but is otherwise harmless.

isComparisonMachOp :: MachOp -> BoolSource

Returns True if the MachOp is a comparison.

If in doubt, return False. This generates worse code on the native routes, but is otherwise harmless.

machOpResultType :: MachOp -> [CmmType] -> CmmTypeSource

Returns the MachRep of the result of a MachOp.

machOpArgReps :: MachOp -> [Width]Source

This function is used for debugging only: we can check whether an application of a MachOp is type-correct by checking that the MachReps of its arguments are the same as the MachOp expects. This is used when linting a CmmExpr.