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https://github.com/c64scene-ar/llvm-6502.git
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799c1ede71
RegAllocGreedy has been the default for six months now. Deleting RegAllocLinearScan makes it possible to also delete VirtRegRewriter and clean up the spiller code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144475 91177308-0d34-0410-b5e6-96231b3b80d8
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
//===-- Passes.cpp - Target independent code generation passes ------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines interfaces to access the target independent code
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// generation passes provided by the LLVM backend.
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//
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//===---------------------------------------------------------------------===//
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#include "llvm/CodeGen/RegAllocRegistry.h"
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#include "llvm/CodeGen/Passes.h"
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using namespace llvm;
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//===---------------------------------------------------------------------===//
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///
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/// RegisterRegAlloc class - Track the registration of register allocators.
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///
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//===---------------------------------------------------------------------===//
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MachinePassRegistry RegisterRegAlloc::Registry;
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static FunctionPass *createDefaultRegisterAllocator() { return 0; }
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static RegisterRegAlloc
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defaultRegAlloc("default",
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"pick register allocator based on -O option",
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createDefaultRegisterAllocator);
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//===---------------------------------------------------------------------===//
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///
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/// RegAlloc command line options.
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///
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//===---------------------------------------------------------------------===//
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static cl::opt<RegisterRegAlloc::FunctionPassCtor, false,
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RegisterPassParser<RegisterRegAlloc> >
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RegAlloc("regalloc",
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cl::init(&createDefaultRegisterAllocator),
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cl::desc("Register allocator to use"));
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//===---------------------------------------------------------------------===//
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///
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/// createRegisterAllocator - choose the appropriate register allocator.
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///
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//===---------------------------------------------------------------------===//
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FunctionPass *llvm::createRegisterAllocator(CodeGenOpt::Level OptLevel) {
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RegisterRegAlloc::FunctionPassCtor Ctor = RegisterRegAlloc::getDefault();
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if (!Ctor) {
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Ctor = RegAlloc;
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RegisterRegAlloc::setDefault(RegAlloc);
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}
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if (Ctor != createDefaultRegisterAllocator)
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return Ctor();
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// When the 'default' allocator is requested, pick one based on OptLevel.
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switch (OptLevel) {
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case CodeGenOpt::None:
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return createFastRegisterAllocator();
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default:
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return createGreedyRegisterAllocator();
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}
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}
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