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* Use BlockIds in branch instructions instead of Imms.
* Assign FP values returned from C calls to the right regs
* Fix loading of F32s
* Add a SPARC version of the FreeRegs map to the linear allcator.
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This merge does not turn on the new codegen (which only compiles
a select few programs at this point),
but it does introduce some changes to the old code generator.
The high bits:
1. The Rep Swamp patch is finally here.
The highlight is that the representation of types at the
machine level has changed.
Consequently, this patch contains updates across several back ends.
2. The new Stg -> Cmm path is here, although it appears to have a
fair number of bugs lurking.
3. Many improvements along the CmmCPSZ path, including:
o stack layout
o some code for infotables, half of which is right and half wrong
o proc-point splitting
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The i386 native code generator has to arrange that the FPU stack is
clear on exit from any function that uses the FPU. Unfortunately it
was getting this wrong (and has been ever since this code was written,
I think): it was looking for basic blocks that used the FPU and adding
the code to clear the FPU stack on any non-local exit from the block.
In fact it should be doing this on a whole-function basis, rather than
individual basic blocks.
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o Moved BlockId stuff to a new file to avoid module recursion
o Defined stack areas for parameter-passing locations and spill slots
o Part way through replacing copy in and copy out nodes
- added movement instructions for stack pointer
- added movement instructions for call and return parameters
(but not with the proper calling conventions)
o Inserting spills and reloads for proc points is now procpoint-aware
(it was relying on the presence of a CopyIn node as a proxy for
procpoint knowledge)
o Changed ZipDataflow to expect AGraphs (instead of being polymorphic in
the type of graph)
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If the value is > 2^63 then we need to work out its value mod 2pi,
and apply the operation to that instead.
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Fixes building with -Werror (i.e. validate) and GHC < 6.6
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The type parameter to a C-- procedure now represents a control-flow
graph, not a single instruction. The newtype ListGraph preserves the
current representation while enabling other representations and a
sensible way of prettyprinting. Except for a few changes in the
prettyprinter the new compiler binary should be bit-for-bit identical
to the old.
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Older GHCs can't parse OPTIONS_GHC.
This also changes the URL referenced for the -w options from
WorkingConventions#Warnings to CodingStyle#Warnings for the compiler
modules.
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Spiller can now insert spill/reload instrs without having to
worry about the current stack delta. Generation of actual machine
instructions for spills/reloads is deferred until after register
allocation proper.
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This is a fairly complete implementation, however
two 'panic's have been placed in the critical path
where the implementation is still a bit lacking so
do not expect it to run quite yet.
One call to panic is because we still need to create
a GC block for procedures that don't have them yet.
(cmm/CmmCPS.hs:continuationToProc)
The other is due to the need to convert from a
ContinuationInfo to a CmmInfo.
(codeGen/CgInfoTbls.hs:emitClosureCodeAndInfoTable)
(codeGen/CgInfoTbls.hs:emitReturnTarget)
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cvts[sd]2siq? ->
cvtts[sd]2siq?
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This is only turned on with -O, and probably won't make much
difference at the moment, but it will be important for semi-tagging.
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Work around the PowerPC architecture's +-32KB limitation for conditional
branches by conditionally skipping an unconditional branch instead
(unconditional branches have a +-32MB range).
This requires an extra pass over the basic blocks for each CmmTop after
block sequencing, to determine which branches are "far".
Fixes ticket #709, "Fixup too large" error with -fasm on PowerPC
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Push this further along, and fix build problems in the first patch.
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Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.
The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level. The build system now makes no
pretense at being multi-project, it is just the GHC build system.
No doubt this will break many things, and there will be a period of
instability while we fix the dependencies. A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.
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