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https://github.com/carbon-language/carbon-lang.git
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aa69a484eb
Adds a flag `--optimize=<mode>` that specifies what to optimize for: * `--optimize=none` turns off the optimizer as much as possible, but still respects always_inline. * `--optimize=debug` aims to be the equivalent of `-Og` / `-O1`, and provides optimizations that don't affect the ability to debug the program. This is the default. * `--optimize=size` optimizes for the size of the produced program, and aims to be the equivalent of `-Oz`. * `--optimize=speed` optimizes for the execution time of the produced program, and aims to be the equivalent of `-O3`. Following the approach taken by Clang, the optimization level feeds into both the configuration of the LLVM pass pipeline and the attributes added to function definitions generated by the frontend. Optimization is performed in a new phase, `optimize`, which runs between `lower` and `codegen`. --------- Co-authored-by: Dana Jansens <danakj@orodu.net> Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "toolchain/codegen/codegen.h"
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#include <memory>
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#include <optional>
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#include <string>
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#include "common/check.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/MC/TargetRegistry.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/TargetParser/Host.h"
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#include "toolchain/diagnostics/diagnostic_consumer.h"
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namespace Carbon {
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auto CodeGen::EmitAssembly(llvm::raw_pwrite_stream& out) -> bool {
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return EmitCode(out, llvm::CodeGenFileType::AssemblyFile);
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}
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auto CodeGen::EmitObject(llvm::raw_pwrite_stream& out) -> bool {
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return EmitCode(out, llvm::CodeGenFileType::ObjectFile);
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}
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auto CodeGen::EmitCode(llvm::raw_pwrite_stream& out,
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llvm::CodeGenFileType file_type) -> bool {
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module_->setDataLayout(target_machine_->createDataLayout());
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// Using the legacy PM to generate the assembly since the new PM
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// does not work with this yet.
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// TODO: Make the new PM work with the codegen pipeline.
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llvm::legacy::PassManager pass;
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// Note that this returns true on an error.
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if (target_machine_->addPassesToEmitFile(pass, out, nullptr, file_type)) {
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CARBON_DIAGNOSTIC(CodeGenUnableToEmit, Error,
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"unable to emit to this file");
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emitter_.Emit(module_->getName(), CodeGenUnableToEmit);
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return false;
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}
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pass.run(*module_);
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return true;
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}
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} // namespace Carbon
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