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* Exposes bSwap{,16,32,64}# primops
* Add a new machop: MO_BSwap
* Use a Stg implementation (hs_bswap{16,32,64}) for other implementation
in NCG.
* Generate bswap in X86 NCG for 32 and 64 bits, and for 16 bits, bswap+shr
instead of using xchg.
* Generate llvm.bswap intrinsics in llvm codegen.
Authored-by: Vincent Hanquez <tab@snarc.org>
Signed-off-by: Austin Seipp <aseipp@pobox.com>
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Clang doesn't like whitespace between macro and arguments.
Signed-off-by: Austin Seipp <aseipp@pobox.com>
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This reverts commit 1c5b0511a89488f5280523569d45ee61c0d09ffa.
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* Exposes bSwap{,16,32,64}# primops
* Add a new machops MO_BSwap
* Use a Stg implementation (hs_bswap{16,32,64}) for other implementation
in NCG.
* Generate bswap in X86 NCG for 32 and 64 bits, and for 16 bits, bswap+shr
instead of using xchg.
* Generate llvm.bswap intrinsics in llvm codegen.
Patch from Vincent Hanquez.
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It now has its own class, and the addImport function is defined in that
class, rather than needing to be passed as an argument.
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This patch is ported from #7510, which fixes the same bug in the x86 nativeGen.
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We have to reduce the maximum number of instructions to jump over depending on the number of info tables in a proc.
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Its implementation is totally specific to PPC.
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There were four bugs here. Clearly I didn't test this enough to
expose the bugs - it appeared to work on x86/Linux, but completely by
accident it seems.
1. the delta was wrong by a factor of the slot size (as noted on #7498)
2. we weren't correctly aligning the stack pointer (sp needs to be
16-byte aligned on x86/x86_64)
3. we were doing the adjustment multiple times in the case of a block
that was both a return point and a local branch target. To fix this I
had to add new shim blocks to adjust the stack pointer, and retarget
the original branches. See comment for details.
4. we were doing the adjustment for CALL instructions, which is
unnecessary and wrong; only JMPs should be preceded by a stack
adjustment.
(Someone with a PPC box will need to update the PPC version of
allocMoreStack to fix the above bugs, using the x86 version as a
guide.)
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Fixes #7498.
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This removes the OldCmm data type and the CmmCvt pass that converts
new Cmm to OldCmm. The backends (NCGs, LLVM and C) have all been
converted to consume new Cmm.
The main difference between the two data types is that conditional
branches in new Cmm have both true/false successors, whereas in OldCmm
the false case was a fallthrough. To generate slightly better code we
occasionally need to invert a conditional to ensure that the
branch-not-taken becomes a fallthrough; this was previously done in
CmmCvt, and it is now done in CmmContFlowOpt.
We could go further and use the Hoopl Block representation for native
code, which would mean that we could use Hoopl's postorderDfs and
analyses for native code, but for now I've left it as is, using the
old ListGraph representation for native code.
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All Cmm procedures now include the set of global registers that are live on
procedure entry, i.e., the global registers used to pass arguments to the
procedure. Only global registers that are use to pass arguments are included in
this list.
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Occurrences in terms are uses, in patterns they are not.
In this way we get unused-constructor warnings from modules like this
module M( f, g, T ) where
data T = T1 | T2 Bool
f x = T2 x
g T1 = True
g (T2 x) = x
Here a T1 value cannot be constructed, so we can warn. The use
in a pattern doesn't count. See Note [Patterns are not uses]
in RnPat.
Interestingly this change exposed three module in GHC itself
that had unused constructors, which I duly removed:
* ghc/Main.hs
* compiler/ghci/ByteCodeAsm
* compiler/nativeGen/PPC/RegInfo
Their changes are in this patch.
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Mostly d -> g (matching DynFlag -> GeneralFlag).
Also renamed if* to when*, matching the Haskell if/when names
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This squashes the "out of spill slots" panic that occasionally happens
on x86, by adding instructions to bump and retreat the C stack pointer
as necessary. The panic has become more common since the new codegen,
because we lump code into larger blocks, and the register allocator
isn't very good at reusing stack slots for spilling (see Note [extra
spill slots]).
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I've switched to passing DynFlags rather than Platform, as (a) it's
simpler to not have to extract targetPlatform in so many places, and
(b) it may be useful to have DynFlags around in future.
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HaskellMachRegs.h is no longer included in anything under compiler/
Also, includes/CodeGen.Platform.hs now includes "stg/MachRegs.h"
rather than <stg/MachRegs.h> which means that we always get the file
from the tree, rather than from the bootstrapping compiler.
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The CmmBlocks inside CmmExprs were not getting the PIC treatment
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No functional differences yet
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Proc-point splitting is only required by backends that do not support
having proc-points within a code block (that is, everything except the
native backend, i.e. LLVM and C).
Not doing proc-point splitting saves some compilation time, and might
produce slightly better code in some cases.
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Hopefully I've kept the logic the same, and we now generate warnings if
the user does -fno-PIC but we ignore them (e.g. because they're on OS X
amd64).
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Means we can stop passing platform around as much.
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We can now get the Platform from the DynFlags inside an SDoc, so we
no longer need to pass the Platform in.
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This avoid lots of converting back and forth between the two types.
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By using Haskell's debugIsOn rather than CPP's "#ifdef DEBUG", we
don't need to kludge things to keep the warning checker happy etc.
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It allows you to do
(high, low) `quotRem` d
provided high < d.
Currently only has an inefficient fallback implementation.
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Currently no NCGs support it
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