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Fix #335: Introduce variable size recipes and remove GPR_SAFE reg classes (#552)

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* Rename size to base_size and introduce a compute_size function;

* Add infra to inspect in/outs registers when computing the size of an instruction;

* Remove the GPR_SAFE_DEREF and GPR_ZERO_DEREF_SAFE register classes on x86 (fixes #335);
This commit is contained in:
Benjamin Bouvier
2018-10-16 00:43:38 +02:00
committed by Dan Gohman
parent c2069762ef
commit 9d6821d6d9
17 changed files with 498 additions and 240 deletions
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30
lib/codegen/meta-python/cdsl/isa.py
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@@ -316,7 +316,8 @@ class EncRecipe(object):
:param name: Short mnemonic name for this recipe.
:param format: All encoded instructions must have this
:py:class:`InstructionFormat`.
:param size: Number of bytes in the binary encoded instruction.
:param base_size: Base number of bytes in the binary encoded instruction.
:param compute_size: Function name to use when computing actual size.
:param ins: Tuple of register constraints for value operands.
:param outs: Tuple of register constraints for results.
:param branch_range: `(origin, bits)` range for branches.
@@ -328,22 +329,25 @@ class EncRecipe(object):
def __init__(
self,
name, # type: str
format, # type: InstructionFormat
size, # type: int
ins, # type: ConstraintSeq
outs, # type: ConstraintSeq
branch_range=None, # type: BranchRange
clobbers_flags=True, # type: bool
instp=None, # type: PredNode
isap=None, # type: PredNode
emit=None # type: str
name, # type: str
format, # type: InstructionFormat
base_size, # type: int
ins, # type: ConstraintSeq
outs, # type: ConstraintSeq
compute_size=None, # type: str
branch_range=None, # type: BranchRange
clobbers_flags=True, # type: bool
instp=None, # type: PredNode
isap=None, # type: PredNode
emit=None # type: str
):
# type: (...) -> None
self.name = name
self.format = format
assert size >= 0
self.size = size
assert base_size >= 0
self.base_size = base_size
self.compute_size = compute_size if compute_size is not None \
else 'base_size'
self.branch_range = branch_range
self.clobbers_flags = clobbers_flags
self.instp = instp