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// LLVM function pass to select the best way to create a work group
// function for a kernel and work group size.
//
// Copyright (c) 2012-2019 Pekka Jääskeläinen
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "CompilerWarnings.h"
IGNORE_COMPILER_WARNING("-Wmaybe-uninitialized")
#include <llvm/ADT/Twine.h>
POP_COMPILER_DIAGS
IGNORE_COMPILER_WARNING("-Wunused-parameter")
#include "llvm/Analysis/PostDominators.h"
#include "llvm/Analysis/LoopInfo.h"
#include "CanonicalizeBarriers.h"
#include "Kernel.h"
#include "LLVMUtils.h"
#include "Workgroup.h"
#include "WorkitemHandlerChooser.h"
#include "WorkitemLoops.h"
#include "WorkitemReplication.h"
POP_COMPILER_DIAGS
#include "pocl_llvm_api.h"
#include <iostream>
#define DEBUG_TYPE "workitem-loops"
#define PASS_NAME "workitem-handler-chooser"
#define PASS_CLASS pocl::WorkitemHandlerChooser
#define PASS_DESC \
"Finds the best way to handle work-items to produce a multi-WG function."
namespace pocl {
using namespace llvm;
static WorkitemHandlerType runWorkitemHandlerChooser(Function &F) {
if (!isKernelToProcess(F))
return WorkitemHandlerType::INVALID;
WorkitemHandlerType Result = WorkitemHandlerType::INVALID;
unsigned long WGLocalSizeX = 0;
unsigned long WGLocalSizeY = 0;
unsigned long WGLocalSizeZ = 0;
bool WGDynamicLocalSize = false;
getModuleIntMetadata(*F.getParent(), "WGLocalSizeX", WGLocalSizeX);
getModuleIntMetadata(*F.getParent(), "WGLocalSizeY", WGLocalSizeY);
getModuleIntMetadata(*F.getParent(), "WGLocalSizeZ", WGLocalSizeZ);
getModuleBoolMetadata(*F.getParent(), "WGDynamicLocalSize",
WGDynamicLocalSize);
std::string method = "auto";
if (getenv("POCL_WORK_GROUP_METHOD") != NULL)
{
method = getenv("POCL_WORK_GROUP_METHOD");
if ((method == "repl" || method == "workitemrepl") && !WGDynamicLocalSize)
Result = WorkitemHandlerType::FULL_REPLICATION;
else if (method == "loops" || method == "workitemloops" || method == "loopvec")
Result = WorkitemHandlerType::LOOPS;
else if (method == "cbs")
Result = WorkitemHandlerType::CBS;
else if (method != "auto")
{
std::cerr << "Unknown work group generation method. Using 'auto'." << std::endl;
method = "auto";
}
}
if (method == "auto")
{
unsigned ReplThreshold = 2;
if (getenv("POCL_FULL_REPLICATION_THRESHOLD") != NULL)
{
ReplThreshold = atoi(getenv("POCL_FULL_REPLICATION_THRESHOLD"));
}
if (!WGDynamicLocalSize &&
WGLocalSizeX * WGLocalSizeY * WGLocalSizeZ <= ReplThreshold) {
Result = WorkitemHandlerType::FULL_REPLICATION;
} else {
Result = WorkitemHandlerType::LOOPS;
}
}
return Result;
}
/**********************************************************************/
#if LLVM_MAJOR < MIN_LLVM_NEW_PASSMANAGER
char WorkitemHandlerChooser::ID = 0;
bool WorkitemHandlerChooser::runOnFunction(Function &F) {
chosenHandler_.WIH = runWorkitemHandlerChooser(F);
return false;
}
void WorkitemHandlerChooser::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
REGISTER_OLD_FPASS(PASS_NAME, PASS_CLASS, PASS_DESC);
#else
llvm::AnalysisKey WorkitemHandlerChooser::Key;
WorkitemHandlerResult
WorkitemHandlerChooser::run(llvm::Function &F,
llvm::FunctionAnalysisManager &AM) {
return runWorkitemHandlerChooser(F);
}
bool WorkitemHandlerResult::invalidate(
llvm::Function &F, const llvm::PreservedAnalyses PA,
llvm::AnalysisManager<llvm::Function>::Invalidator &Inv) {
// Check whether the analysis has been explicitly invalidated.
// Otherwise, it stays valid
auto PAC = PA.getChecker<WorkitemHandlerChooser>();
return !PAC.preservedWhenStateless();
}
REGISTER_NEW_FANALYSIS(PASS_NAME, PASS_CLASS, PASS_DESC);
#endif
} // namespace pocl
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