ghc-8.2.1: The GHC API

CmmUtils

Synopsis

# Documentation

Useful for creating an index into an array, with a statically known offset. The type is the element type; used for making the multiplier

Useful for creating an index into an array, with an unknown offset.

Returns True if the two STG registers overlap on the specified platform, in the sense that writing to one will clobber the other. This includes the case that the two registers are the same STG register. See Note [Overlapping global registers] for details.

Returns True if the STG register is used by the expression, in the sense that a store to the register might affect the value of the expression.

We must check for overlapping registers and not just equal registers here, otherwise CmmSink may incorrectly reorder assignments that conflict due to overlap. See Trac #10521 and Note [Overlapping global registers].

# Operations that probably don't belong here

like toBlockList, but the entry block always comes first

Like toBlockListEntryFirst, but we strive to ensure that we order blocks so that the false case of a conditional jumps to the next block in the output list of blocks. This matches the way OldCmm blocks were output since in OldCmm the false case was a fallthrough, whereas in Cmm conditional branches have both true and false successors. Block ordering can make a big difference in performance in the LLVM backend. Note that we rely crucially on the order of successors returned for CmmCondBranch by the NonLocal instance for CmmNode defind in cmm/CmmNode.hs. -GBM

foldGraphBlocks :: (CmmBlock -> a -> a) -> a -> CmmGraph -> a Source #

mapGraphNodes1 :: (forall e x. CmmNode e x -> CmmNode e x) -> CmmGraph -> CmmGraph Source #

# Ticks

Extract all tick annotations from the given block