mirror of https://github.com/m-labs/artiq.git
compiler: tune the LLVM optimizer pipeline (fixes #315).
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3ee9834197
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@ -79,6 +79,23 @@ class Target:
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def __init__(self):
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self.llcontext = ll.Context()
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def target_machine(self):
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lltarget = llvm.Target.from_triple(self.triple)
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return lltarget.create_target_machine(
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features=",".join(["+{}".format(f) for f in self.features]),
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reloc="pic", codemodel="default")
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def optimize(self, llmodule):
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llpassmgr = llvm.create_module_pass_manager()
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self.target_machine().target_data.add_pass(llpassmgr)
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llpassmgr.add_constant_merge_pass()
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llpassmgr.add_cfg_simplification_pass()
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llpassmgr.add_instruction_combining_pass()
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llpassmgr.add_sroa_pass()
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llpassmgr.add_dead_code_elimination_pass()
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llpassmgr.add_gvn_pass()
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llpassmgr.run(llmodule)
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def compile(self, module):
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"""Compile the module to a relocatable object for this target."""
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@ -102,14 +119,7 @@ class Target:
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_dump(os.getenv("ARTIQ_DUMP_UNOPT_LLVM"), "LLVM IR (generated)", "_unopt.ll",
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lambda: str(llparsedmod))
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llpassmgrbuilder = llvm.create_pass_manager_builder()
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llpassmgrbuilder.opt_level = 2 # -O2
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llpassmgrbuilder.size_level = 1 # -Os
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llpassmgrbuilder.inlining_threshold = 75 # -Os threshold
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llpassmgr = llvm.create_module_pass_manager()
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llpassmgrbuilder.populate(llpassmgr)
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llpassmgr.run(llparsedmod)
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self.optimize(llparsedmod)
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_dump(os.getenv("ARTIQ_DUMP_LLVM"), "LLVM IR (optimized)", ".ll",
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lambda: str(llparsedmod))
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@ -117,10 +127,7 @@ class Target:
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return llparsedmod
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def assemble(self, llmodule):
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lltarget = llvm.Target.from_triple(self.triple)
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llmachine = lltarget.create_target_machine(
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features=",".join(["+{}".format(f) for f in self.features]),
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reloc="pic", codemodel="default")
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llmachine = self.target_machine()
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_dump(os.getenv("ARTIQ_DUMP_ASM"), "Assembly", ".s",
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lambda: llmachine.emit_assembly(llmodule))
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