mirror of https://github.com/m-labs/artiq.git
compiler: Emit all-kernel_invariant objects as LLVM constants
This enables constant propagation optimisations, as verified by the included test case. This is only a first stop-gap measure, though; we should support optimisation based on kernel invariants on a more fine-grained level.
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@ -1384,6 +1384,7 @@ class LLVMIRGenerator:
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def _quote_attributes():
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llglobal = None
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llfields = []
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emit_as_constant = True
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for attr in typ.attributes:
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if attr == "__objectid__":
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objectid = self.embedding_map.store_object(value)
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@ -1404,6 +1405,8 @@ class LLVMIRGenerator:
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not types.is_c_function(typ.attributes[attr]))
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if is_class_function:
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attrvalue = self.embedding_map.specialize_function(typ.instance, attrvalue)
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if not (types.is_instance(typ) and attr in typ.constant_attributes):
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emit_as_constant = False
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llattrvalue = self._quote(attrvalue, typ.attributes[attr],
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lambda: path() + [attr])
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llfields.append(llattrvalue)
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@ -1411,6 +1414,7 @@ class LLVMIRGenerator:
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llclosureptr = self.get_global_closure_ptr(typ, attr)
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llclosureptr.initializer = llattrvalue
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llglobal.global_constant = emit_as_constant
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llglobal.initializer = ll.Constant(llty.pointee, llfields)
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llglobal.linkage = "private"
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return llglobal
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@ -0,0 +1,26 @@
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# RUN: env ARTIQ_DUMP_LLVM=%t %python -m artiq.compiler.testbench.embedding +compile %s
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# RUN: OutputCheck %s --file-to-check=%t.ll
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from artiq.language.core import *
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from artiq.language.types import *
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class Class:
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kernel_invariants = {"foo"}
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def __init__(self):
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self.foo = True
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@kernel
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def run(self):
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if self.foo:
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print("bar")
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else:
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# Make sure all the code for this branch will be completely elided:
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# CHECK-NOT: baz
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print("baz")
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obj = Class()
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@kernel
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def entrypoint():
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obj.run()
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