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compiler: tune the LLVM optimizer pipeline (fixes #315).

This commit is contained in:
whitequark 2016-03-26 13:20:23 +00:00 committed by Sebastien Bourdeauducq
parent 8fa4281470
commit ccb1d54beb
1 changed files with 19 additions and 12 deletions
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31
artiq/compiler/targets.py
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@ -79,6 +79,23 @@ class Target:
def __init__(self): def __init__(self):
self.llcontext = ll.Context() self.llcontext = ll.Context()
def target_machine(self):
lltarget = llvm.Target.from_triple(self.triple)
return lltarget.create_target_machine(
features=",".join(["+{}".format(f) for f in self.features]),
reloc="pic", codemodel="default")
def optimize(self, llmodule):
llpassmgr = llvm.create_module_pass_manager()
self.target_machine().target_data.add_pass(llpassmgr)
llpassmgr.add_constant_merge_pass()
llpassmgr.add_cfg_simplification_pass()
llpassmgr.add_instruction_combining_pass()
llpassmgr.add_sroa_pass()
llpassmgr.add_dead_code_elimination_pass()
llpassmgr.add_gvn_pass()
llpassmgr.run(llmodule)
def compile(self, module): def compile(self, module):
"""Compile the module to a relocatable object for this target.""" """Compile the module to a relocatable object for this target."""
@ -102,14 +119,7 @@ class Target:
_dump(os.getenv("ARTIQ_DUMP_UNOPT_LLVM"), "LLVM IR (generated)", "_unopt.ll", _dump(os.getenv("ARTIQ_DUMP_UNOPT_LLVM"), "LLVM IR (generated)", "_unopt.ll",
lambda: str(llparsedmod)) lambda: str(llparsedmod))
llpassmgrbuilder = llvm.create_pass_manager_builder() self.optimize(llparsedmod)
llpassmgrbuilder.opt_level = 2 # -O2
llpassmgrbuilder.size_level = 1 # -Os
llpassmgrbuilder.inlining_threshold = 75 # -Os threshold
llpassmgr = llvm.create_module_pass_manager()
llpassmgrbuilder.populate(llpassmgr)
llpassmgr.run(llparsedmod)
_dump(os.getenv("ARTIQ_DUMP_LLVM"), "LLVM IR (optimized)", ".ll", _dump(os.getenv("ARTIQ_DUMP_LLVM"), "LLVM IR (optimized)", ".ll",
lambda: str(llparsedmod)) lambda: str(llparsedmod))
@ -117,10 +127,7 @@ class Target:
return llparsedmod return llparsedmod
def assemble(self, llmodule): def assemble(self, llmodule):
lltarget = llvm.Target.from_triple(self.triple) llmachine = self.target_machine()
llmachine = lltarget.create_target_machine(
features=",".join(["+{}".format(f) for f in self.features]),
reloc="pic", codemodel="default")
_dump(os.getenv("ARTIQ_DUMP_ASM"), "Assembly", ".s", _dump(os.getenv("ARTIQ_DUMP_ASM"), "Assembly", ".s",
lambda: llmachine.emit_assembly(llmodule)) lambda: llmachine.emit_assembly(llmodule))