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Patch from Preston Briggs <preston.briggs@gmail.com>.
This is an updated version of the dependence-analysis patch, including an MIV
test based on Banerjee's inequalities.
It's a fairly complete implementation of the paper
Practical Dependence Testing
Gina Goff, Ken Kennedy, and Chau-Wen Tseng
PLDI 1991
It cannot yet propagate constraints between coupled RDIV subscripts (discussed
in Section 5.3.2 of the paper).
It's organized as a FunctionPass with a single entry point that supports testing
for dependence between two instructions in a function. If there's no dependence,
it returns null. If there's a dependence, it returns a pointer to a Dependence
which can be queried about details (what kind of dependence, is it loop
independent, direction and distance vector entries, etc). I haven't included
every imaginable feature, but there's a good selection that should be adequate
for supporting many loop transformations. Of course, it can be extended as
necessary.
Included in the patch file are many test cases, commented with C code showing
the loops and array references.
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attribute.
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This pass converts LLVM's special symbols llvm.global_ctors and
llvm.global_dtors to concrete arrays, __init_array_start/end and
__fini_array_start/end, that are usable by a C library.
The pass sorts the contents of global_ctors/dtors according to the
priority values they contain and removes the priority values.
This pass will allow us to simplify the PNaCl ABI so that less is done
at translation time.
BUG= http://code.google.com/p/nativeclient/issues/detail?id=3018
TEST=test/Transforms/NaCl/expand-ctors*.ll
Review URL: https://codereview.chromium.org/10977030
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information.
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SchedulerDAGInstrs::buildSchedGraph ignores dependencies between FixedStack
objects and byval parameters. So loading byval parameters from stack may be
inserted *before* it will be stored, since these operations are treated as
independent.
Fix:
Currently ARMTargetLowering::LowerFormalArguments saves byval registers with
FixedStack MachinePointerInfo. To fix the problem we need to store byval
registers with MachinePointerInfo referenced to first the "byval" parameter.
Also commit adds two new fields to the InputArg structure: Function's argument
index and InputArg's part offset in bytes relative to the start position of
Function's argument. E.g.: If function's argument is 128 bit width and it was
splitted onto 32 bit regs, then we got 4 InputArg structs with same arg index,
but different offset values.
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namespace. Use the attribute's enum value instead. No functionality change
intended.
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enums. These are then created via the correct Attributes creation method.
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Allows the new machine model to be used for NumMicroOps and OutputLatency.
Allows the HazardRecognizer to be disabled along with itineraries.
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attribute object and add it appropriately. No functionality change.
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determine whether or not a section is meant to be read-only. These functions will be used by the MCJIT RuntimeDyld to give hints to the memory manager during the object loading process in a future patch.
Patch by Ashok Thirumurthi.
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external users of TargetSchedule.
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This wasn't contributing anything significant to postRA heuristics except compile time (by my measurements) and will be replaced by a more general heuristic for cross-region dependencies within the scheduler itself.
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functionality change intended.
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space.
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only one module.
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the test.
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clear() method.
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User's operands directly as values, which can be convenient.
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to the data layout for specifying a per address space pointer size.
The next step is to update the optimizers to allow them to optimize the different address spaces with this information.
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a method.
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builder.
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DeadArgumentElimination pass can replace one LLVM function with another,
invalidating a pointer stored in debug info metadata entry for this function.
To fix this, we collect debug info descriptors for functions before
running a DeadArgumentElimination pass and "patch" pointers in metadata nodes
if we replace a function.
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We use the enums to query whether an Attributes object has that attribute. The
opaque layer is responsible for knowing where that specific attribute is stored.
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methods for them.
No functionality change intended.
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