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Unfortunately this will require more work; register allocation is
quite broken.
This reverts commit acd795583625401c5554f8e04ec7efca18814011.
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This adds support for constructing vector types from Float#, Double# etc
and performing arithmetic operations on them
Cleaned-Up-By: Ben Gamari <ben@well-typed.com>
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* simplifies registers to have GPR, Float and Double, by removing the SSE2 and X87 Constructors
* makes -msse2 assumed/default for x86 platforms, fixing a long standing nondeterminism in rounding
behavior in 32bit haskell code
* removes the 80bit floating point representation from the supported float sizes
* theres still 1 tiny bit of x87 support needed,
for handling float and double return values in FFI calls wrt the C ABI on x86_32,
but this one piece does not leak into the rest of NCG.
* Lots of code thats not been touched in a long time got deleted as a
consequence of all of this
all in all, this change paves the way towards a lot of future further
improvements in how GHC handles floating point computations, along with
making the native code gen more accessible to a larger pool of contributors.
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This switches the compiler/ component to get compiled with
-XNoImplicitPrelude and a `import GhcPrelude` is inserted in all
modules.
This is motivated by the upcoming "Prelude" re-export of
`Semigroup((<>))` which would cause lots of name clashes in every
modulewhich imports also `Outputable`
Reviewers: austin, goldfire, bgamari, alanz, simonmar
Reviewed By: bgamari
Subscribers: goldfire, rwbarton, thomie, mpickering, bgamari
Differential Revision: https://phabricator.haskell.org/D3989
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I found that tests
parser/should_compile/DumpRenamedAst
and friends were printing uniques, which makes the test fragile.
But -dsuppress-uniques made no difference! It turned out that
pprName wasn't properly consulting Opt_SuppressUniques.
This patch fixes the problem, and updates those three tests to
use -dsuppress-uniques
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Ord Unique can be a source of invisible, accidental
nondeterminism as explained in Note [No Ord for Unique].
This removes it, leaving a note with rationale.
It's unfortunate that I had to write Ord instances for
codegen data structures by hand, but I believe that it's a
right trade-off here.
Test Plan: ./validate
Reviewers: simonmar, austin, bgamari
Reviewed By: simonmar
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D2370
GHC Trac Issues: #4012
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After the changes, the three functions used to print type families
were identical, so they are refactored into one.
Original RHSs of data instance declarations are recreated and
printed in user error messages.
RHSs containing representation TyCons are printed in the
Coercion Axioms section in a typechecker dump.
Add vbar to the list of SDocs exported by Outputable.
Replace all text "|" docs with it.
Fixes #10839
Reviewers: goldfire, jstolarek, austin, bgamari
Reviewed By: jstolarek
Subscribers: jstolarek, thomie
Differential Revision: https://phabricator.haskell.org/D1441
GHC Trac Issues: #10839
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Signed-off-by: Austin Seipp <austin@well-typed.com>
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In some cases, the layout of the LANGUAGE/OPTIONS_GHC lines has been
reorganized, while following the convention, to
- place `{-# LANGUAGE #-}` pragmas at the top of the source file, before
any `{-# OPTIONS_GHC #-}`-lines.
- Moreover, if the list of language extensions fit into a single
`{-# LANGUAGE ... -#}`-line (shorter than 80 characters), keep it on one
line. Otherwise split into `{-# LANGUAGE ... -#}`-lines for each
individual language extension. In both cases, try to keep the
enumeration alphabetically ordered.
(The latter layout is preferable as it's more diff-friendly)
While at it, this also replaces obsolete `{-# OPTIONS ... #-}` pragma
occurences by `{-# OPTIONS_GHC ... #-}` pragmas.
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We only use it for "compiler" sources, i.e. not for libraries.
Many modules have a -fno-warn-tabs kludge for now.
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The new flag -msse2 enables code generation for SSE2 on x86. It
results in substantially faster floating-point performance; the main
reason for doing this was that our x87 code generation is appallingly
bad, and since we plan to drop -fvia-C soon, we need a way to generate
half-decent floating-point code.
The catch is that SSE2 is only available on CPUs that support it (P4+,
AMD K8+). We'll have to think hard about whether we should enable it
by default for the libraries we ship. In the meantime, at least
-msse2 should be an acceptable replacement for "-fvia-C
-optc-ffast-math -fexcess-precision".
SSE2 also has the advantage of performing all operations at the
correct precision, so floating-point results are consistent with other
platforms.
I also tweaked the x87 code generation a bit while I was here, now
it's slighlty less bad than before.
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variables
DO NOT MERGE TO GHC 6.12 branch
(Reason: interface file format change.)
The typechecker needs to instantiate otherwise-unconstraint type variables to
an appropriately-kinded constant type, but we didn't have a supply of
arbitrarily-kinded tycons for this purpose. Now we do.
The details are described in Note [Any types] in TysPrim. The
fundamental change is that there is a new sort of TyCon, namely
AnyTyCon, defined in TyCon.
Ter's a small change to interface-file binary format, because the new
AnyTyCons have to be serialised.
I tided up the handling of uniques a bit too, so that mkUnique is not
exported, so that we can see all the different name spaces in one module.
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* The old Reg type is now split into VirtualReg and RealReg.
* For the graph coloring allocator, the type of the register graph
is now (Graph VirtualReg RegClass RealReg), which shows that it colors
in nodes representing virtual regs with colors representing real regs.
(as was intended)
* RealReg contains two contructors, RealRegSingle and RealRegPair,
where RealRegPair is used to represent a SPARC double reg
constructed from two single precision FP regs.
* On SPARC we can now allocate double regs into an arbitrary register
pair, instead of reserving some reg ranges to only hold float/double values.
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- nativeGen/Instruction defines a type class for a generic
instruction set. Each of the instruction sets we have,
X86, PPC and SPARC are instances of it.
- The register alloctors use this type class when they need
info about a certain register or instruction, such as
regUsage, mkSpillInstr, mkJumpInstr, patchRegs..
- nativeGen/Platform defines some data types enumerating
the architectures and operating systems supported by the
native code generator.
- DynFlags now keeps track of the current build platform, and
the PositionIndependentCode module uses this to decide what
to do instead of relying of #ifdefs.
- It's not totally retargetable yet. Some info info about the
build target is still hardwired, but I've tried to contain
most of it to a single module, TargetRegs.
- Moved the SPILL and RELOAD instructions into LiveInstr.
- Reg and RegClass now have their own modules, and are shared
across all architectures.
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