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// LLVM module pass to inline only required functions (those accessing
// per-workgroup variables) into the kernel.
//
// Copyright (c) 2011 Universidad Rey Juan Carlos
// 2012-2015 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 AACTION 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/ADT/SmallPtrSet.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include <llvm/Pass.h>
#include "FlattenGlobals.hh"
#include "LLVMUtils.h"
#include "Workgroup.h"
#include "WorkitemHandlerChooser.h"
POP_COMPILER_DIAGS
#include <iostream>
#include <string>
#include "pocl_llvm_api.h"
//#define DEBUG_FLATTEN
#define PASS_NAME "flatten-globals"
#define PASS_CLASS pocl::FlattenGlobals
#define PASS_DESC \
"Kernel function flattening pass - flatten global vars' users only"
namespace pocl {
using namespace llvm;
static bool flattenGlobals(Module &M) {
SmallPtrSet<Function *, 8> functions_to_inline;
SmallVector<Value *, 8> pending;
const char **GVs = WorkgroupVariablesArray;
while (*GVs != NULL) {
GlobalVariable *GV = M.getGlobalVariable(*GVs);
if (GV != NULL)
pending.push_back(GV);
++GVs;
}
while (!pending.empty()) {
Value *v = pending.back();
pending.pop_back();
for (Value::use_iterator i = v->use_begin(), e = v->use_end(); i != e;
++i) {
llvm::User *user = i->getUser();
if (Instruction *ci = dyn_cast<Instruction>(user)) {
// Prevent infinite looping on recursive functions
// (though OpenCL does not allow this?)
Function *f = ci->getParent()->getParent();
;
assert(
(f != NULL) &&
"Per-workgroup global variable used on function with no parent!");
if (functions_to_inline.count(f))
continue;
// if it's an OpenCL kernel with OptNone attribute, assume we're debugging,
// and don't inline the kernel into the workgroup launcher.
// this makes it possible to debug kernel code with GDB.
if (pocl::isKernelToProcess(*f) &&
f->hasFnAttribute(Attribute::OptimizeNone))
continue;
functions_to_inline.insert(f);
pending.push_back(f);
}
}
}
for (SmallPtrSet<Function *, 8>::iterator i = functions_to_inline.begin(),
e = functions_to_inline.end();
i != e; ++i) {
(*i)->removeFnAttr(Attribute::NoInline);
(*i)->removeFnAttr(Attribute::OptimizeNone);
(*i)->addFnAttr(Attribute::AlwaysInline);
}
StringRef barrier("_Z7barrierj");
for (llvm::Module::iterator i = M.begin(), e = M.end(); i != e; ++i) {
llvm::Function *f = &*i;
if (f->isDeclaration())
continue;
if (f->getName().equals(barrier)) {
f->removeFnAttr(Attribute::NoInline);
f->removeFnAttr(Attribute::OptimizeNone);
f->addFnAttr(Attribute::AlwaysInline);
}
}
return true;
}
#if LLVM_MAJOR < MIN_LLVM_NEW_PASSMANAGER
char FlattenGlobals::ID = 0;
bool FlattenGlobals::runOnModule(Module &M) { return flattenGlobals(M); }
void FlattenGlobals::getAnalysisUsage(llvm::AnalysisUsage &AU) const {
AU.addPreserved<WorkitemHandlerChooser>();
}
REGISTER_OLD_MPASS(PASS_NAME, PASS_CLASS, PASS_DESC);
#else
llvm::PreservedAnalyses FlattenGlobals::run(llvm::Module &M,
llvm::ModuleAnalysisManager &AM) {
PreservedAnalyses PAChanged = PreservedAnalyses::none();
PAChanged.preserve<WorkitemHandlerChooser>();
return flattenGlobals(M) ? PAChanged : PreservedAnalyses::all();
}
REGISTER_NEW_MPASS(PASS_NAME, PASS_CLASS, PASS_DESC);
#endif
} // namespace pocl
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