1 -- -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow 1994-2004
5 -- -----------------------------------------------------------------------------
38 sp, r3, r4, r27, r28, f1, f20, f21,
43 get_GlobalReg_reg_or_addr,
50 #include "nativeGen/NCG.h"
51 #include "HsVersions.h"
52 #include "../includes/stg/MachRegs.h"
58 import CgUtils ( get_GlobalReg_addr )
61 import CLabel ( CLabel )
65 import Outputable ( panic, SDoc )
66 import qualified Outputable
71 import Data.Word ( Word8, Word16, Word32 )
72 import Data.Int ( Int8, Int16, Int32 )
75 -- squeese functions for the graph allocator -----------------------------------
77 -- | regSqueeze_class reg
78 -- Calculuate the maximum number of register colors that could be
79 -- denied to a node of this class due to having this reg
82 {-# INLINE virtualRegSqueeze #-}
83 virtualRegSqueeze :: RegClass -> VirtualReg -> FastInt
84 virtualRegSqueeze cls vr
88 VirtualRegI{} -> _ILIT(1)
89 VirtualRegHi{} -> _ILIT(1)
94 VirtualRegD{} -> _ILIT(1)
95 VirtualRegF{} -> _ILIT(0)
100 {-# INLINE realRegSqueeze #-}
101 realRegSqueeze :: RegClass -> RealReg -> FastInt
102 realRegSqueeze cls rr
107 | regNo < 32 -> _ILIT(1) -- first fp reg is 32
108 | otherwise -> _ILIT(0)
110 RealRegPair{} -> _ILIT(0)
115 | regNo < 32 -> _ILIT(0)
116 | otherwise -> _ILIT(1)
118 RealRegPair{} -> _ILIT(0)
122 mkVirtualReg :: Unique -> Size -> VirtualReg
124 | not (isFloatSize size) = VirtualRegI u
127 FF32 -> VirtualRegD u
128 FF64 -> VirtualRegD u
129 _ -> panic "mkVirtualReg"
131 regDotColor :: RealReg -> SDoc
133 = case classOfRealReg reg of
134 RcInteger -> Outputable.text "blue"
135 RcFloat -> Outputable.text "red"
136 RcDouble -> Outputable.text "green"
137 RcDoubleSSE -> Outputable.text "yellow"
140 -- immediates ------------------------------------------------------------------
143 | ImmInteger Integer -- Sigh.
144 | ImmCLbl CLabel -- AbstractC Label (with baggage)
145 | ImmLit Doc -- Simple string
146 | ImmIndex CLabel Int
149 | ImmConstantSum Imm Imm
150 | ImmConstantDiff Imm Imm
153 | HA Imm {- high halfword adjusted -}
156 strImmLit :: String -> Imm
157 strImmLit s = ImmLit (text s)
160 litToImm :: CmmLit -> Imm
161 litToImm (CmmInt i w) = ImmInteger (narrowS w i)
162 -- narrow to the width: a CmmInt might be out of
163 -- range, but we assume that ImmInteger only contains
164 -- in-range values. A signed value should be fine here.
165 litToImm (CmmFloat f W32) = ImmFloat f
166 litToImm (CmmFloat f W64) = ImmDouble f
167 litToImm (CmmLabel l) = ImmCLbl l
168 litToImm (CmmLabelOff l off) = ImmIndex l off
169 litToImm (CmmLabelDiffOff l1 l2 off)
171 (ImmConstantDiff (ImmCLbl l1) (ImmCLbl l2))
173 litToImm (CmmBlock id) = ImmCLbl (infoTblLbl id)
174 litToImm _ = panic "PPC.Regs.litToImm: no match"
177 -- addressing modes ------------------------------------------------------------
184 addrOffset :: AddrMode -> Int -> Maybe AddrMode
187 AddrRegImm r (ImmInt n)
188 | fits16Bits n2 -> Just (AddrRegImm r (ImmInt n2))
189 | otherwise -> Nothing
192 AddrRegImm r (ImmInteger n)
193 | fits16Bits n2 -> Just (AddrRegImm r (ImmInt (fromInteger n2)))
194 | otherwise -> Nothing
195 where n2 = n + toInteger off
200 -- registers -------------------------------------------------------------------
201 -- @spRel@ gives us a stack relative addressing mode for volatile
202 -- temporaries and for excess call arguments. @fpRel@, where
203 -- applicable, is the same but for the frame pointer.
205 spRel :: Int -- desired stack offset in words, positive or negative
208 spRel n = AddrRegImm sp (ImmInt (n * wORD_SIZE))
211 -- argRegs is the set of regs which are read for an n-argument call to C.
212 -- For archs which pass all args on the stack (x86), is empty.
213 -- Sparc passes up to the first 6 args in regs.
214 -- Dunno about Alpha.
215 argRegs :: RegNo -> [Reg]
217 argRegs 1 = map regSingle [3]
218 argRegs 2 = map regSingle [3,4]
219 argRegs 3 = map regSingle [3..5]
220 argRegs 4 = map regSingle [3..6]
221 argRegs 5 = map regSingle [3..7]
222 argRegs 6 = map regSingle [3..8]
223 argRegs 7 = map regSingle [3..9]
224 argRegs 8 = map regSingle [3..10]
225 argRegs _ = panic "MachRegs.argRegs(powerpc): don't know about >8 arguments!"
229 allArgRegs = map regSingle [3..10]
232 -- these are the regs which we cannot assume stay alive over a C call.
233 callClobberedRegs :: [Reg]
234 #if defined(darwin_TARGET_OS)
236 = map regSingle (0:[2..12] ++ map fReg [0..13])
238 #elif defined(linux_TARGET_OS)
240 = map regSingle (0:[2..13] ++ map fReg [0..13])
244 = panic "PPC.Regs.callClobberedRegs: not defined for this architecture"
248 allMachRegNos :: [RegNo]
249 allMachRegNos = [0..63]
252 {-# INLINE classOfRealReg #-}
253 classOfRealReg :: RealReg -> RegClass
254 classOfRealReg (RealRegSingle i)
256 | otherwise = RcDouble
258 classOfRealReg (RealRegPair{})
259 = panic "regClass(ppr): no reg pairs on this architecture"
261 showReg :: RegNo -> String
263 | n >= 0 && n <= 31 = "%r" ++ show n
264 | n >= 32 && n <= 63 = "%f" ++ show (n - 32)
265 | otherwise = "%unknown_powerpc_real_reg_" ++ show n
269 -- machine specific ------------------------------------------------------------
271 allFPArgRegs :: [Reg]
272 #if defined(darwin_TARGET_OS)
273 allFPArgRegs = map (regSingle . fReg) [1..13]
275 #elif defined(linux_TARGET_OS)
276 allFPArgRegs = map (regSingle . fReg) [1..8]
279 allFPArgRegs = panic "PPC.Regs.allFPArgRegs: not defined for this architecture"
283 fits16Bits :: Integral a => a -> Bool
284 fits16Bits x = x >= -32768 && x < 32768
286 makeImmediate :: Integral a => Width -> Bool -> a -> Maybe Imm
287 makeImmediate rep signed x = fmap ImmInt (toI16 rep signed)
289 narrow W32 False = fromIntegral (fromIntegral x :: Word32)
290 narrow W16 False = fromIntegral (fromIntegral x :: Word16)
291 narrow W8 False = fromIntegral (fromIntegral x :: Word8)
292 narrow W32 True = fromIntegral (fromIntegral x :: Int32)
293 narrow W16 True = fromIntegral (fromIntegral x :: Int16)
294 narrow W8 True = fromIntegral (fromIntegral x :: Int8)
295 narrow _ _ = panic "PPC.Regs.narrow: no match"
297 narrowed = narrow rep signed
300 | narrowed >= -32768 && narrowed < 32768 = Just narrowed
301 | otherwise = Nothing
303 | narrowed >= 0 && narrowed < 65536 = Just narrowed
304 | otherwise = Nothing
305 toI16 _ _ = Just narrowed
309 The PowerPC has 64 registers of interest; 32 integer registers and 32 floating
316 sp, r3, r4, r27, r28, f1, f20, f21 :: Reg
322 f1 = regSingle $ fReg 1
323 f20 = regSingle $ fReg 20
324 f21 = regSingle $ fReg 21
328 -- horror show -----------------------------------------------------------------
329 freeReg :: RegNo -> FastBool
330 globalRegMaybe :: GlobalReg -> Maybe Reg
333 #if powerpc_TARGET_ARCH
367 #ifdef darwin_TARGET_OS
437 freeReg 0 = fastBool False -- Hack: r0 can't be used in all insns, but it's actually free
438 freeReg 1 = fastBool False -- The Stack Pointer
439 #if !darwin_TARGET_OS
440 -- most non-darwin powerpc OSes use r2 as a TOC pointer or something like that
441 freeReg 2 = fastBool False
445 freeReg REG_Base = fastBool False
448 freeReg REG_R1 = fastBool False
451 freeReg REG_R2 = fastBool False
454 freeReg REG_R3 = fastBool False
457 freeReg REG_R4 = fastBool False
460 freeReg REG_R5 = fastBool False
463 freeReg REG_R6 = fastBool False
466 freeReg REG_R7 = fastBool False
469 freeReg REG_R8 = fastBool False
472 freeReg REG_F1 = fastBool False
475 freeReg REG_F2 = fastBool False
478 freeReg REG_F3 = fastBool False
481 freeReg REG_F4 = fastBool False
484 freeReg REG_D1 = fastBool False
487 freeReg REG_D2 = fastBool False
490 freeReg REG_Sp = fastBool False
493 freeReg REG_Su = fastBool False
496 freeReg REG_SpLim = fastBool False
499 freeReg REG_Hp = fastBool False
502 freeReg REG_HpLim = fastBool False
504 freeReg _ = fastBool True
507 -- | Returns 'Nothing' if this global register is not stored
508 -- in a real machine register, otherwise returns @'Just' reg@, where
509 -- reg is the machine register it is stored in.
513 globalRegMaybe BaseReg = Just (regSingle REG_Base)
516 globalRegMaybe (VanillaReg 1 _) = Just (regSingle REG_R1)
519 globalRegMaybe (VanillaReg 2 _) = Just (regSingle REG_R2)
522 globalRegMaybe (VanillaReg 3 _) = Just (regSingle REG_R3)
525 globalRegMaybe (VanillaReg 4 _) = Just (regSingle REG_R4)
528 globalRegMaybe (VanillaReg 5 _) = Just (regSingle REG_R5)
531 globalRegMaybe (VanillaReg 6 _) = Just (regSingle REG_R6)
534 globalRegMaybe (VanillaReg 7 _) = Just (regSingle REG_R7)
537 globalRegMaybe (VanillaReg 8 _) = Just (regSingle REG_R8)
540 globalRegMaybe (VanillaReg 9 _) = Just (regSingle REG_R9)
543 globalRegMaybe (VanillaReg 10 _) = Just (regSingle REG_R10)
546 globalRegMaybe (FloatReg 1) = Just (regSingle REG_F1)
549 globalRegMaybe (FloatReg 2) = Just (regSingle REG_F2)
552 globalRegMaybe (FloatReg 3) = Just (regSingle REG_F3)
555 globalRegMaybe (FloatReg 4) = Just (regSingle REG_F4)
558 globalRegMaybe (DoubleReg 1) = Just (regSingle REG_D1)
561 globalRegMaybe (DoubleReg 2) = Just (regSingle REG_D2)
564 globalRegMaybe Sp = Just (regSingle REG_Sp)
567 globalRegMaybe (LongReg 1) = Just (regSingle REG_Lng1)
570 globalRegMaybe (LongReg 2) = Just (regSingle REG_Lng2)
573 globalRegMaybe SpLim = Just (regSingle REG_SpLim)
576 globalRegMaybe Hp = Just (regSingle REG_Hp)
579 globalRegMaybe HpLim = Just (regSingle REG_HpLim)
581 #ifdef REG_CurrentTSO
582 globalRegMaybe CurrentTSO = Just (regSingle REG_CurrentTSO)
584 #ifdef REG_CurrentNursery
585 globalRegMaybe CurrentNursery = Just (regSingle REG_CurrentNursery)
587 globalRegMaybe _ = Nothing
590 #else /* powerpc_TARGET_ARCH */
593 globalRegMaybe _ = panic "PPC.Regs.globalRegMaybe: not defined"
595 #endif /* powerpc_TARGET_ARCH */
598 -- We map STG registers onto appropriate CmmExprs. Either they map
599 -- to real machine registers or stored as offsets from BaseReg. Given
600 -- a GlobalReg, get_GlobalReg_reg_or_addr produces either the real
601 -- register it is in, on this platform, or a CmmExpr denoting the
602 -- address in the register table holding it.
603 -- (See also get_GlobalReg_addr in CgUtils.)
605 get_GlobalReg_reg_or_addr :: GlobalReg -> Either Reg CmmExpr
606 get_GlobalReg_reg_or_addr mid
607 = case globalRegMaybe mid of
609 Nothing -> Right (get_GlobalReg_addr mid)
612 -- allocatableRegs is allMachRegNos with the fixed-use regs removed.
613 -- i.e., these are the regs for which we are prepared to allow the
614 -- register allocator to attempt to map VRegs to.
615 allocatableRegs :: [RealReg]
617 = let isFree i = isFastTrue (freeReg i)
618 in map RealRegSingle $ filter isFree allMachRegNos