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|
{-# OPTIONS -w #-}
-- The above warning supression flag is a temporary kludge.
-- While working on this module you are encouraged to remove it and fix
-- any warnings in the module. See
-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
-- for details
-----------------------------------------------------------------------------
--
-- Machine-specific parts of the register allocator
--
-- (c) The University of Glasgow 1996-2004
--
-----------------------------------------------------------------------------
module RegAllocInfo (
-- shared code
shortcutStatic,
-- machine specific
RegUsage(..),
noUsage,
regUsage,
patchRegs,
jumpDests,
isJumpish,
patchJump,
isRegRegMove,
JumpDest,
canShortcut,
shortcutJump,
mkSpillInstr,
mkLoadInstr,
mkRegRegMoveInstr,
mkBranchInstr,
maxSpillSlots,
spillSlotToOffset
) where
#include "nativeGen/NCG.h"
#include "HsVersions.h"
import BlockId
import Cmm
import CLabel
import Instrs
import Regs
import Outputable
import Constants ( rESERVED_C_STACK_BYTES )
import FastBool
#if alpha_TARGET_ARCH
import Alpha.RegInfo
#elif i386_TARGET_ARCH || x86_64_TARGET_ARCH
import X86.RegInfo
#elif powerpc_TARGET_ARCH
import PPC.RegInfo
#elif sparc_TARGET_ARCH
import SPARC.RegInfo
#endif
-- Here because it knows about JumpDest
shortcutStatic :: (BlockId -> Maybe JumpDest) -> CmmStatic -> CmmStatic
shortcutStatic fn (CmmStaticLit (CmmLabel lab))
| Just uq <- maybeAsmTemp lab
= CmmStaticLit (CmmLabel (shortBlockId fn (BlockId uq)))
shortcutStatic fn (CmmStaticLit (CmmLabelDiffOff lbl1 lbl2 off))
| Just uq <- maybeAsmTemp lbl1
= CmmStaticLit (CmmLabelDiffOff (shortBlockId fn (BlockId uq)) lbl2 off)
-- slightly dodgy, we're ignoring the second label, but this
-- works with the way we use CmmLabelDiffOff for jump tables now.
shortcutStatic fn other_static
= other_static
shortBlockId fn blockid@(BlockId uq) =
case fn blockid of
Nothing -> mkAsmTempLabel uq
Just (DestBlockId blockid') -> shortBlockId fn blockid'
Just (DestImm (ImmCLbl lbl)) -> lbl
_other -> panic "shortBlockId"
|
