import PrimOp ( PrimOp(..) )
import CallConv ( cCallConv )
import Stix ( getNatLabelNCG, StixTree(..),
- StixReg(..), CodeSegment(..),
+ StixReg(..), CodeSegment(..), DestInfo,
pprStixTree, ppStixReg,
NatM, thenNat, returnNat, mapNat,
mapAndUnzipNat, mapAccumLNat,
StLabel lab -> returnNat (unitOL (LABEL lab))
- StJump arg -> genJump (derefDLL arg)
+ StJump dsts arg -> genJump dsts (derefDLL arg)
StCondJump lab arg -> genCondJump lab (derefDLL arg)
-- A call returning void, ie one done for its side-effects
]
where
shift DoubleRep = 3::Integer
- shift CharRep = 0::Integer
+ shift CharRep = 2::Integer
+ shift Int8Rep = 0::Integer
shift _ = IF_ARCH_alpha(3,2)
\end{code}
Int2DoubleOp -> coerceInt2FP DoubleRep x
other_op ->
- let
- fixed_x = if is_float_op -- promote to double
- then StPrim Float2DoubleOp [x]
- else x
- in
getRegister (StCall fn cCallConv DoubleRep [x])
where
(is_float_op, fn)
FloatNegOp -> trivialUFCode FloatRep (FNEG F) x
DoubleNegOp -> trivialUFCode DoubleRep (FNEG DF) x
+ DoubleNegOp -> trivialUFCode DoubleRep (FNEG DF) x
+
Double2FloatOp -> trivialUFCode FloatRep (FxTOy DF F) x
Float2DoubleOp -> trivialUFCode DoubleRep (FxTOy F DF) x
code1 = registerCode register1 tmp1
src1 = registerName register1 tmp1
- pk2 = registerRep register2
code2 = registerCode register2 tmp2
src2 = registerName register2 tmp2
register allocator.
\begin{code}
-genJump :: StixTree{-the branch target-} -> NatM InstrBlock
+genJump :: DestInfo -> StixTree{-the branch target-} -> NatM InstrBlock
#if alpha_TARGET_ARCH
target = ImmCLbl lbl
genJump tree
- = getRegister tree `thenNat` \ register ->
+ = getRegister tree `thenNat` \ register ->
getNewRegNCG PtrRep `thenNat` \ tmp ->
let
dst = registerName register pv
-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#if i386_TARGET_ARCH
-genJump (StInd pk mem)
+genJump dsts (StInd pk mem)
= getAmode mem `thenNat` \ amode ->
let
code = amodeCode amode
target = amodeAddr amode
in
- returnNat (code `snocOL` JMP (OpAddr target))
+ returnNat (code `snocOL` JMP dsts (OpAddr target))
-genJump tree
+genJump dsts tree
| maybeToBool imm
- = returnNat (unitOL (JMP (OpImm target)))
+ = returnNat (unitOL (JMP dsts (OpImm target)))
| otherwise
= getRegister tree `thenNat` \ register ->
code = registerCode register tmp
target = registerName register tmp
in
- returnNat (code `snocOL` JMP (OpReg target))
+ returnNat (code `snocOL` JMP dsts (OpReg target))
where
imm = maybeImm tree
target = case imm of Just x -> x
if (case sz of DF -> True; F -> True; _ -> False)
then returnNat (size,
code `appOL`
- toOL [SUB L (OpImm (ImmInt 8)) (OpReg esp),
+ toOL [SUB L (OpImm (ImmInt size)) (OpReg esp),
DELTA (delta-size),
GST sz reg (AddrBaseIndex (Just esp)
Nothing
#endif {- i386_TARGET_ARCH -}
-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#if sparc_TARGET_ARCH
-genCCall fn cconv kind args
- = mapAccumLNat get_arg (allArgRegs, eXTRA_STK_ARGS_HERE) args
- `thenNat` \ ((unused,_), argCode) ->
- let
+{-
+ The SPARC calling convention is an absolute
+ nightmare. The first 6x32 bits of arguments are mapped into
+ %o0 through %o5, and the remaining arguments are dumped to the
+ stack, beginning at [%sp+92]. (Note that %o6 == %sp.)
+
+ If we have to put args on the stack, move %o6==%sp down by
+ the number of words to go on the stack, to ensure there's enough space.
+
+ According to Fraser and Hanson's lcc book, page 478, fig 17.2,
+ 16 words above the stack pointer is a word for the address of
+ a structure return value. I use this as a temporary location
+ for moving values from float to int regs. Certainly it isn't
+ safe to put anything in the 16 words starting at %sp, since
+ this area can get trashed at any time due to window overflows
+ caused by signal handlers.
+
+ A final complication (if the above isn't enough) is that
+ we can't blithely calculate the arguments one by one into
+ %o0 .. %o5. Consider the following nested calls:
+
+ fff a (fff b c)
+
+ Naive code moves a into %o0, and (fff b c) into %o1. Unfortunately
+ the inner call will itself use %o0, which trashes the value put there
+ in preparation for the outer call. Upshot: we need to calculate the
+ args into temporary regs, and move those to arg regs or onto the
+ stack only immediately prior to the call proper. Sigh.
+-}
- nRegs = length allArgRegs - length unused
- call = unitOL (CALL fn__2 nRegs False)
- code = concatOL argCode
-
- -- 3 because in the worst case, %o0 .. %o5 will only use up 3 args
+genCCall fn cconv kind args
+ = mapNat arg_to_int_vregs args `thenNat` \ argcode_and_vregs ->
+ let (argcodes, vregss) = unzip argcode_and_vregs
+ argcode = concatOL argcodes
+ vregs = concat vregss
+ n_argRegs = length allArgRegs
+ n_argRegs_used = min (length vregs) n_argRegs
(move_sp_down, move_sp_up)
- = let nn = length args - 3
+ = let nn = length vregs - n_argRegs
+ + 1 -- (for the road)
in if nn <= 0
then (nilOL, nilOL)
- else (unitOL (moveSp (-(2*nn))), unitOL (moveSp (2*nn)))
- in
- returnNat (move_sp_down `appOL`
- code `appOL`
- call `appOL`
- unitOL NOP `appOL`
+ else (unitOL (moveSp (-1*nn)), unitOL (moveSp (1*nn)))
+ transfer_code
+ = toOL (move_final vregs allArgRegs eXTRA_STK_ARGS_HERE)
+ call
+ = unitOL (CALL fn__2 n_argRegs_used False)
+ in
+ returnNat (argcode `appOL`
+ move_sp_down `appOL`
+ transfer_code `appOL`
+ call `appOL`
+ unitOL NOP `appOL`
move_sp_up)
where
- -- function names that begin with '.' are assumed to be special
- -- internally generated names like '.mul,' which don't get an
- -- underscore prefix
- -- ToDo:needed (WDP 96/03) ???
- fn__2 = case (_HEAD_ fn) of
- '.' -> ImmLit (ptext fn)
- _ -> ImmLab False (ptext fn)
-
- ------------------------------------
- {- Try to get a value into a specific register (or registers) for
- a call. The SPARC calling convention is an absolute
- nightmare. The first 6x32 bits of arguments are mapped into
- %o0 through %o5, and the remaining arguments are dumped to the
- stack, beginning at [%sp+92]. (Note that %o6 == %sp.) Our
- first argument is a pair of the list of remaining argument
- registers to be assigned for this call and the next stack
- offset to use for overflowing arguments. This way,
- @get_arg@ can be applied to all of a call's arguments using
- @mapAccumL@.
-
- If we have to put args on the stack, move %o6==%sp down by
- 8 x the number of args, to ensure there's enough space.
- -}
- get_arg
- :: ([Reg],Int) -- Argument registers and stack offset (accumulator)
- -> StixTree -- Current argument
- -> NatM (([Reg],Int), InstrBlock) -- Updated accumulator and code
-
- -- We have to use up all of our argument registers first...
-
- get_arg (dst:dsts, offset) arg
- = getRegister arg `thenNat` \ register ->
- getNewRegNCG (registerRep register)
- `thenNat` \ tmp ->
- let
- reg = if isFloatingRep pk then tmp else dst
- code = registerCode register reg
- src = registerName register reg
- pk = registerRep register
- in
- returnNat (
- case pk of
- DoubleRep ->
- case dsts of
- [] -> ( ([], offset + 1),
- code `snocOL`
- -- put the second part in the right stack
- -- and load the first part into %o5
- FMOV DF src f0 `snocOL`
- ST F f0 (spRel offset) `snocOL`
- LD W (spRel offset) dst `snocOL`
- ST F (fPair f0) (spRel offset)
- )
- (dst__2:dsts__2)
- -> ( (dsts__2, offset),
- code `snocOL`
- FMOV DF src f0 `snocOL`
- ST F f0 (spRel 16) `snocOL`
- LD W (spRel 16) dst `snocOL`
- ST F (fPair f0) (spRel 16) `snocOL`
- LD W (spRel 16) dst__2
- )
- FloatRep
- -> ( (dsts, offset),
- code `snocOL`
- ST F src (spRel 16) `snocOL`
- LD W (spRel 16) dst
- )
- _ -> ( (dsts, offset),
- if isFixed register
- then code `snocOL` OR False g0 (RIReg src) dst
- else code
- )
- )
- -- Once we have run out of argument registers, we move to the
- -- stack...
-
- get_arg ([], offset) arg
- = getRegister arg `thenNat` \ register ->
- getNewRegNCG (registerRep register)
- `thenNat` \ tmp ->
- let
- code = registerCode register tmp
- src = registerName register tmp
- pk = registerRep register
- sz = primRepToSize pk
- words = if pk == DoubleRep then 2 else 1
- in
- returnNat ( ([], offset + words),
- code `snocOL` ST sz src (spRel offset) )
-
+ -- function names that begin with '.' are assumed to be special
+ -- internally generated names like '.mul,' which don't get an
+ -- underscore prefix
+ -- ToDo:needed (WDP 96/03) ???
+ fn__2 = case (_HEAD_ fn) of
+ '.' -> ImmLit (ptext fn)
+ _ -> ImmLab False (ptext fn)
+
+ -- move args from the integer vregs into which they have been
+ -- marshalled, into %o0 .. %o5, and the rest onto the stack.
+ move_final :: [Reg] -> [Reg] -> Int -> [Instr]
+
+ move_final [] _ offset -- all args done
+ = []
+
+ move_final (v:vs) [] offset -- out of aregs; move to stack
+ = ST W v (spRel offset)
+ : move_final vs [] (offset+1)
+
+ move_final (v:vs) (a:az) offset -- move into an arg (%o[0..5]) reg
+ = OR False g0 (RIReg v) a
+ : move_final vs az offset
+
+ -- generate code to calculate an argument, and move it into one
+ -- or two integer vregs.
+ arg_to_int_vregs :: StixTree -> NatM (OrdList Instr, [Reg])
+ arg_to_int_vregs arg
+ = getRegister arg `thenNat` \ register ->
+ getNewRegNCG (registerRep register) `thenNat` \ tmp ->
+ let code = registerCode register tmp
+ src = registerName register tmp
+ pk = registerRep register
+ in
+ -- the value is in src. Get it into 1 or 2 int vregs.
+ case pk of
+ DoubleRep ->
+ getNewRegNCG WordRep `thenNat` \ v1 ->
+ getNewRegNCG WordRep `thenNat` \ v2 ->
+ returnNat (
+ code `snocOL`
+ FMOV DF src f0 `snocOL`
+ ST F f0 (spRel 16) `snocOL`
+ LD W (spRel 16) v1 `snocOL`
+ ST F (fPair f0) (spRel 16) `snocOL`
+ LD W (spRel 16) v2
+ ,
+ [v1,v2]
+ )
+ FloatRep ->
+ getNewRegNCG WordRep `thenNat` \ v1 ->
+ returnNat (
+ code `snocOL`
+ ST F src (spRel 16) `snocOL`
+ LD W (spRel 16) v1
+ ,
+ [v1]
+ )
+ other ->
+ getNewRegNCG WordRep `thenNat` \ v1 ->
+ returnNat (
+ code `snocOL` OR False g0 (RIReg src) v1
+ ,
+ [v1]
+ )
#endif {- sparc_TARGET_ARCH -}
\end{code}
%* *
%************************************************************************
-Integer to character conversion. Where applicable, we try to do this
-in one step if the original object is in memory.
+Integer to character conversion.
\begin{code}
chrCode :: StixTree -> NatM Register
#if alpha_TARGET_ARCH
+-- TODO: This is probably wrong, but I don't know Alpha assembler.
+-- It should coerce a 64-bit value to a 32-bit value.
+
chrCode x
= getRegister x `thenNat` \ register ->
getNewRegNCG IntRep `thenNat` \ reg ->
chrCode x
= getRegister x `thenNat` \ register ->
- let
- code__2 dst = let
- code = registerCode register dst
- src = registerName register dst
- in code `appOL`
- if isFixed register && src /= dst
- then toOL [MOV L (OpReg src) (OpReg dst),
- AND L (OpImm (ImmInt 255)) (OpReg dst)]
- else unitOL (AND L (OpImm (ImmInt 255)) (OpReg src))
- in
- returnNat (Any IntRep code__2)
+ returnNat (
+ case register of
+ Fixed _ reg code -> Fixed IntRep reg code
+ Any _ code -> Any IntRep code
+ )
#endif {- i386_TARGET_ARCH -}
-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#if sparc_TARGET_ARCH
-chrCode (StInd pk mem)
- = getAmode mem `thenNat` \ amode ->
- let
- code = amodeCode amode
- src = amodeAddr amode
- src_off = addrOffset src 3
- src__2 = case src_off of Just x -> x
- code__2 dst = if maybeToBool src_off then
- code `snocOL` LD BU src__2 dst
- else
- code `snocOL`
- LD (primRepToSize pk) src dst `snocOL`
- AND False dst (RIImm (ImmInt 255)) dst
- in
- returnNat (Any pk code__2)
-
chrCode x
= getRegister x `thenNat` \ register ->
- getNewRegNCG IntRep `thenNat` \ reg ->
- let
- code = registerCode register reg
- src = registerName register reg
- code__2 dst = code `snocOL` AND False src (RIImm (ImmInt 255)) dst
- in
- returnNat (Any IntRep code__2)
+ returnNat (
+ case register of
+ Fixed _ reg code -> Fixed IntRep reg code
+ Any _ code -> Any IntRep code
+ )
#endif {- sparc_TARGET_ARCH -}
\end{code}
projects / ghc-hetmet.git / blobdiff