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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
1.6 KiB
C++
49 lines
1.6 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/lower/lower.h"
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#include <memory>
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#include <optional>
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#include "common/vlog.h"
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#include "llvm/IR/Verifier.h"
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#include "toolchain/lower/context.h"
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#include "toolchain/lower/file_context.h"
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namespace Carbon::Lower {
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auto LowerToLLVM(
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llvm::LLVMContext& llvm_context,
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llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
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const Parse::GetTreeAndSubtreesStore& tree_and_subtrees_getters,
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const SemIR::File& sem_ir, int total_ir_count,
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const LowerToLLVMOptions& options) -> std::unique_ptr<llvm::Module> {
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Context context(&llvm_context, std::move(fs), options.want_debug_info,
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&tree_and_subtrees_getters, sem_ir.filename(), total_ir_count,
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options.opt_level, options.vlog_stream);
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// TODO: Consider disabling instruction naming by default if we're not
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// producing textual LLVM IR.
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SemIR::InstNamer inst_namer(&sem_ir, total_ir_count);
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context.GetFileContext(&sem_ir, &inst_namer).LowerDefinitions();
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std::unique_ptr<llvm::Module> module = std::move(context).Finalize();
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if (options.vlog_stream) {
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CARBON_VLOG_TO(options.vlog_stream, "*** llvm::Module ***\n");
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module->print(*options.vlog_stream, /*AAW=*/nullptr,
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/*ShouldPreserveUseListOrder=*/false,
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/*IsForDebug=*/true);
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}
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if (options.llvm_verifier_stream) {
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CARBON_CHECK(!llvm::verifyModule(*module, options.llvm_verifier_stream));
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}
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return module;
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}
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} // namespace Carbon::Lower
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