diff options
Diffstat (limited to 'compiler/GHC/Cmm/Expr.hs')
| -rw-r--r-- | compiler/GHC/Cmm/Expr.hs | 286 |
1 files changed, 20 insertions, 266 deletions
diff --git a/compiler/GHC/Cmm/Expr.hs b/compiler/GHC/Cmm/Expr.hs index 86b06271d1..7f94f3f3dd 100644 --- a/compiler/GHC/Cmm/Expr.hs +++ b/compiler/GHC/Cmm/Expr.hs @@ -9,22 +9,16 @@ module GHC.Cmm.Expr ( CmmExpr(..), cmmExprType, cmmExprWidth, cmmExprAlignment, maybeInvertCmmExpr , CmmReg(..), cmmRegType, cmmRegWidth , CmmLit(..), cmmLitType - , LocalReg(..), localRegType - , GlobalReg(..), isArgReg, globalRegType + , LocalReg(..), LocalRegSet, localRegType + , globalRegType , spReg, hpReg, spLimReg, hpLimReg, nodeReg , currentTSOReg, currentNurseryReg, hpAllocReg, cccsReg - , node, baseReg - , VGcPtr(..) + , baseReg , DefinerOfRegs, UserOfRegs , foldRegsDefd, foldRegsUsed , foldLocalRegsDefd, foldLocalRegsUsed - , RegSet, LocalRegSet, GlobalRegSet - , emptyRegSet, elemRegSet, extendRegSet, deleteFromRegSet, mkRegSet - , plusRegSet, minusRegSet, timesRegSet, sizeRegSet, nullRegSet - , regSetToList - , Area(..) , module GHC.Cmm.MachOp , module GHC.Cmm.Type @@ -34,6 +28,8 @@ where import GHC.Prelude import GHC.Platform +import GHC.Cmm.Reg.Global +import GHC.Cmm.Reg.Set import GHC.Cmm.BlockId import GHC.Cmm.CLabel import GHC.Cmm.MachOp @@ -42,9 +38,6 @@ import GHC.Utils.Panic (panic) import GHC.Utils.Outputable import GHC.Types.Unique -import Data.Set (Set) -import qualified Data.Set as Set - import GHC.Types.Basic (Alignment, mkAlignment, alignmentOf) ----------------------------------------------------------------------------- @@ -280,6 +273,8 @@ data LocalReg -- 1. Identifier -- 2. Type +type LocalRegSet = RegSet LocalReg + instance Eq LocalReg where (LocalReg u1 _) == (LocalReg u2 _) = u1 == u2 @@ -306,40 +301,6 @@ localRegType (LocalReg _ rep) = rep -- Register-use information for expressions and other types ----------------------------------------------------------------------------- --- | Sets of registers - --- These are used for dataflow facts, and a common operation is taking --- the union of two RegSets and then asking whether the union is the --- same as one of the inputs. UniqSet isn't good here, because --- sizeUniqSet is O(n) whereas Set.size is O(1), so we use ordinary --- Sets. - -type RegSet r = Set r -type LocalRegSet = RegSet LocalReg -type GlobalRegSet = RegSet GlobalReg - -emptyRegSet :: RegSet r -nullRegSet :: RegSet r -> Bool -elemRegSet :: Ord r => r -> RegSet r -> Bool -extendRegSet :: Ord r => RegSet r -> r -> RegSet r -deleteFromRegSet :: Ord r => RegSet r -> r -> RegSet r -mkRegSet :: Ord r => [r] -> RegSet r -minusRegSet, plusRegSet, timesRegSet :: Ord r => RegSet r -> RegSet r -> RegSet r -sizeRegSet :: RegSet r -> Int -regSetToList :: RegSet r -> [r] - -emptyRegSet = Set.empty -nullRegSet = Set.null -elemRegSet = Set.member -extendRegSet = flip Set.insert -deleteFromRegSet = flip Set.delete -mkRegSet = Set.fromList -minusRegSet = Set.difference -plusRegSet = Set.union -timesRegSet = Set.intersection -sizeRegSet = Set.size -regSetToList = Set.toList - class Ord r => UserOfRegs r a where foldRegsUsed :: Platform -> (b -> r -> b) -> b -> a -> b @@ -397,217 +358,6 @@ instance DefinerOfRegs r a => DefinerOfRegs r [a] where foldRegsDefd platform f set as = foldl' (foldRegsDefd platform f) set as {-# INLINABLE foldRegsDefd #-} ------------------------------------------------------------------------------ --- Global STG registers ------------------------------------------------------------------------------ - -data VGcPtr = VGcPtr | VNonGcPtr deriving( Eq, Show ) - ------------------------------------------------------------------------------ --- Global STG registers ------------------------------------------------------------------------------ -{- -Note [Overlapping global registers] - -The backend might not faithfully implement the abstraction of the STG -machine with independent registers for different values of type -GlobalReg. Specifically, certain pairs of registers (r1, r2) may -overlap in the sense that a store to r1 invalidates the value in r2, -and vice versa. - -Currently this occurs only on the x86_64 architecture where FloatReg n -and DoubleReg n are assigned the same microarchitectural register, in -order to allow functions to receive more Float# or Double# arguments -in registers (as opposed to on the stack). - -There are no specific rules about which registers might overlap with -which other registers, but presumably it's safe to assume that nothing -will overlap with special registers like Sp or BaseReg. - -Use GHC.Cmm.Utils.regsOverlap to determine whether two GlobalRegs overlap -on a particular platform. The instance Eq GlobalReg is syntactic -equality of STG registers and does not take overlap into -account. However it is still used in UserOfRegs/DefinerOfRegs and -there are likely still bugs there, beware! --} - -data GlobalReg - -- Argument and return registers - = VanillaReg -- pointers, unboxed ints and chars - {-# UNPACK #-} !Int -- its number - VGcPtr - - | FloatReg -- single-precision floating-point registers - {-# UNPACK #-} !Int -- its number - - | DoubleReg -- double-precision floating-point registers - {-# UNPACK #-} !Int -- its number - - | LongReg -- long int registers (64-bit, really) - {-# UNPACK #-} !Int -- its number - - | XmmReg -- 128-bit SIMD vector register - {-# UNPACK #-} !Int -- its number - - | YmmReg -- 256-bit SIMD vector register - {-# UNPACK #-} !Int -- its number - - | ZmmReg -- 512-bit SIMD vector register - {-# UNPACK #-} !Int -- its number - - -- STG registers - | Sp -- Stack ptr; points to last occupied stack location. - | SpLim -- Stack limit - | Hp -- Heap ptr; points to last occupied heap location. - | HpLim -- Heap limit register - | CCCS -- Current cost-centre stack - | CurrentTSO -- pointer to current thread's TSO - | CurrentNursery -- pointer to allocation area - | HpAlloc -- allocation count for heap check failure - - -- We keep the address of some commonly-called - -- functions in the register table, to keep code - -- size down: - | EagerBlackholeInfo -- stg_EAGER_BLACKHOLE_info - | GCEnter1 -- stg_gc_enter_1 - | GCFun -- stg_gc_fun - - -- Base offset for the register table, used for accessing registers - -- which do not have real registers assigned to them. This register - -- will only appear after we have expanded GlobalReg into memory accesses - -- (where necessary) in the native code generator. - | BaseReg - - -- The register used by the platform for the C stack pointer. This is - -- a break in the STG abstraction used exclusively to setup stack unwinding - -- information. - | MachSp - - -- The is a dummy register used to indicate to the stack unwinder where - -- a routine would return to. - | UnwindReturnReg - - -- Base Register for PIC (position-independent code) calculations - -- Only used inside the native code generator. It's exact meaning differs - -- from platform to platform (see module PositionIndependentCode). - | PicBaseReg - - deriving( Show ) - -instance Eq GlobalReg where - VanillaReg i _ == VanillaReg j _ = i==j -- Ignore type when seeking clashes - FloatReg i == FloatReg j = i==j - DoubleReg i == DoubleReg j = i==j - LongReg i == LongReg j = i==j - -- NOTE: XMM, YMM, ZMM registers actually are the same registers - -- at least with respect to store at YMM i and then read from XMM i - -- and similarly for ZMM etc. - XmmReg i == XmmReg j = i==j - YmmReg i == YmmReg j = i==j - ZmmReg i == ZmmReg j = i==j - Sp == Sp = True - SpLim == SpLim = True - Hp == Hp = True - HpLim == HpLim = True - CCCS == CCCS = True - CurrentTSO == CurrentTSO = True - CurrentNursery == CurrentNursery = True - HpAlloc == HpAlloc = True - EagerBlackholeInfo == EagerBlackholeInfo = True - GCEnter1 == GCEnter1 = True - GCFun == GCFun = True - BaseReg == BaseReg = True - MachSp == MachSp = True - UnwindReturnReg == UnwindReturnReg = True - PicBaseReg == PicBaseReg = True - _r1 == _r2 = False - --- NOTE: this Ord instance affects the tuple layout in GHCi, see --- Note [GHCi tuple layout] -instance Ord GlobalReg where - compare (VanillaReg i _) (VanillaReg j _) = compare i j - -- Ignore type when seeking clashes - compare (FloatReg i) (FloatReg j) = compare i j - compare (DoubleReg i) (DoubleReg j) = compare i j - compare (LongReg i) (LongReg j) = compare i j - compare (XmmReg i) (XmmReg j) = compare i j - compare (YmmReg i) (YmmReg j) = compare i j - compare (ZmmReg i) (ZmmReg j) = compare i j - compare Sp Sp = EQ - compare SpLim SpLim = EQ - compare Hp Hp = EQ - compare HpLim HpLim = EQ - compare CCCS CCCS = EQ - compare CurrentTSO CurrentTSO = EQ - compare CurrentNursery CurrentNursery = EQ - compare HpAlloc HpAlloc = EQ - compare EagerBlackholeInfo EagerBlackholeInfo = EQ - compare GCEnter1 GCEnter1 = EQ - compare GCFun GCFun = EQ - compare BaseReg BaseReg = EQ - compare MachSp MachSp = EQ - compare UnwindReturnReg UnwindReturnReg = EQ - compare PicBaseReg PicBaseReg = EQ - compare (VanillaReg _ _) _ = LT - compare _ (VanillaReg _ _) = GT - compare (FloatReg _) _ = LT - compare _ (FloatReg _) = GT - compare (DoubleReg _) _ = LT - compare _ (DoubleReg _) = GT - compare (LongReg _) _ = LT - compare _ (LongReg _) = GT - compare (XmmReg _) _ = LT - compare _ (XmmReg _) = GT - compare (YmmReg _) _ = LT - compare _ (YmmReg _) = GT - compare (ZmmReg _) _ = LT - compare _ (ZmmReg _) = GT - compare Sp _ = LT - compare _ Sp = GT - compare SpLim _ = LT - compare _ SpLim = GT - compare Hp _ = LT - compare _ Hp = GT - compare HpLim _ = LT - compare _ HpLim = GT - compare CCCS _ = LT - compare _ CCCS = GT - compare CurrentTSO _ = LT - compare _ CurrentTSO = GT - compare CurrentNursery _ = LT - compare _ CurrentNursery = GT - compare HpAlloc _ = LT - compare _ HpAlloc = GT - compare GCEnter1 _ = LT - compare _ GCEnter1 = GT - compare GCFun _ = LT - compare _ GCFun = GT - compare BaseReg _ = LT - compare _ BaseReg = GT - compare MachSp _ = LT - compare _ MachSp = GT - compare UnwindReturnReg _ = LT - compare _ UnwindReturnReg = GT - compare EagerBlackholeInfo _ = LT - compare _ EagerBlackholeInfo = GT - --- convenient aliases -baseReg, spReg, hpReg, spLimReg, hpLimReg, nodeReg, - currentTSOReg, currentNurseryReg, hpAllocReg, cccsReg :: CmmReg -baseReg = CmmGlobal BaseReg -spReg = CmmGlobal Sp -hpReg = CmmGlobal Hp -hpLimReg = CmmGlobal HpLim -spLimReg = CmmGlobal SpLim -nodeReg = CmmGlobal node -currentTSOReg = CmmGlobal CurrentTSO -currentNurseryReg = CmmGlobal CurrentNursery -hpAllocReg = CmmGlobal HpAlloc -cccsReg = CmmGlobal CCCS - -node :: GlobalReg -node = VanillaReg 1 VGcPtr - globalRegType :: Platform -> GlobalReg -> CmmType globalRegType platform = \case (VanillaReg _ VGcPtr) -> gcWord platform @@ -626,12 +376,16 @@ globalRegType platform = \case -- dynamically allocated closures _ -> bWord platform -isArgReg :: GlobalReg -> Bool -isArgReg (VanillaReg {}) = True -isArgReg (FloatReg {}) = True -isArgReg (DoubleReg {}) = True -isArgReg (LongReg {}) = True -isArgReg (XmmReg {}) = True -isArgReg (YmmReg {}) = True -isArgReg (ZmmReg {}) = True -isArgReg _ = False +-- convenient aliases +baseReg, spReg, hpReg, spLimReg, hpLimReg, nodeReg, + currentTSOReg, currentNurseryReg, hpAllocReg, cccsReg :: CmmReg +baseReg = CmmGlobal BaseReg +spReg = CmmGlobal Sp +hpReg = CmmGlobal Hp +hpLimReg = CmmGlobal HpLim +spLimReg = CmmGlobal SpLim +nodeReg = CmmGlobal node +currentTSOReg = CmmGlobal CurrentTSO +currentNurseryReg = CmmGlobal CurrentNursery +hpAllocReg = CmmGlobal HpAlloc +cccsReg = CmmGlobal CCCS |