e811cb00e5
This patch implements support for the UNROLL directive to control how many times a loop should be unrolled. It must be placed immediately before a `DO LOOP` and applies only to the loop that follows. N is an integer that specifying the unrolling factor. This is done by adding an attribute to the branch into the loop in LLVM to indicate that the loop should unrolled. The code pushed to support the directive `VECTOR ALWAYS` has been modified to take account of the fact that several directives can be used before a `DO LOOP`.
125 lines
4.2 KiB
C++
125 lines
4.2 KiB
C++
//===-- lib/Semantics/canonicalize-directives.cpp -------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "canonicalize-directives.h"
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#include "flang/Parser/parse-tree-visitor.h"
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#include "flang/Semantics/tools.h"
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namespace Fortran::semantics {
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using namespace parser::literals;
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// Check that directives are associated with the correct constructs.
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// Directives that need to be associated with other constructs in the execution
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// part are moved to the execution part so they can be checked there.
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class CanonicalizationOfDirectives {
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public:
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CanonicalizationOfDirectives(parser::Messages &messages)
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: messages_{messages} {}
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template <typename T> bool Pre(T &) { return true; }
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template <typename T> void Post(T &) {}
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// Move directives that must appear in the Execution part out of the
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// Specification part.
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void Post(parser::SpecificationPart &spec);
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bool Pre(parser::ExecutionPart &x);
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// Ensure that directives associated with constructs appear accompanying the
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// construct.
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void Post(parser::Block &block);
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private:
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// Ensure that loop directives appear immediately before a loop.
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void CheckLoopDirective(parser::CompilerDirective &dir, parser::Block &block,
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std::list<parser::ExecutionPartConstruct>::iterator it);
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parser::Messages &messages_;
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// Directives to be moved to the Execution part from the Specification part.
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std::list<common::Indirection<parser::CompilerDirective>>
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directivesToConvert_;
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};
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bool CanonicalizeDirectives(
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parser::Messages &messages, parser::Program &program) {
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CanonicalizationOfDirectives dirs{messages};
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Walk(program, dirs);
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return !messages.AnyFatalError();
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}
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static bool IsExecutionDirective(const parser::CompilerDirective &dir) {
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return std::holds_alternative<parser::CompilerDirective::VectorAlways>(
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dir.u) ||
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std::holds_alternative<parser::CompilerDirective::Unroll>(dir.u);
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}
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void CanonicalizationOfDirectives::Post(parser::SpecificationPart &spec) {
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auto &list{
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std::get<std::list<common::Indirection<parser::CompilerDirective>>>(
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spec.t)};
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for (auto it{list.begin()}; it != list.end();) {
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if (IsExecutionDirective(it->value())) {
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directivesToConvert_.emplace_back(std::move(*it));
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it = list.erase(it);
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} else {
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++it;
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}
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}
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}
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bool CanonicalizationOfDirectives::Pre(parser::ExecutionPart &x) {
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auto origFirst{x.v.begin()};
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for (auto &dir : directivesToConvert_) {
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x.v.insert(origFirst,
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parser::ExecutionPartConstruct{
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parser::ExecutableConstruct{std::move(dir)}});
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}
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directivesToConvert_.clear();
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return true;
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}
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void CanonicalizationOfDirectives::CheckLoopDirective(
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parser::CompilerDirective &dir, parser::Block &block,
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std::list<parser::ExecutionPartConstruct>::iterator it) {
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// Skip over this and other compiler directives
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while (it != block.end() && parser::Unwrap<parser::CompilerDirective>(*it)) {
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++it;
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}
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if (it == block.end() ||
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(!parser::Unwrap<parser::DoConstruct>(*it) &&
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!parser::Unwrap<parser::OpenACCLoopConstruct>(*it) &&
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!parser::Unwrap<parser::OpenACCCombinedConstruct>(*it))) {
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std::string s{parser::ToUpperCaseLetters(dir.source.ToString())};
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s.pop_back(); // Remove trailing newline from source string
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messages_.Say(
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dir.source, "A DO loop must follow the %s directive"_warn_en_US, s);
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}
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}
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void CanonicalizationOfDirectives::Post(parser::Block &block) {
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for (auto it{block.begin()}; it != block.end(); ++it) {
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if (auto *dir{parser::Unwrap<parser::CompilerDirective>(*it)}) {
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std::visit(
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common::visitors{[&](parser::CompilerDirective::VectorAlways &) {
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CheckLoopDirective(*dir, block, it);
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},
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[&](parser::CompilerDirective::Unroll &) {
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CheckLoopDirective(*dir, block, it);
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},
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[&](auto &) {}},
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dir->u);
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}
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}
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}
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} // namespace Fortran::semantics
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