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transformersaturation.cpp
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rXR Xreate
transformersaturation.cpp
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/*
* transformersaturation.cpp
*
* Author: pgess <v.melnychenko@xreate.org>
* Created on March 25, 2017, 10:06 PM
*/
#include "transformersaturation.h"
#include "llvmlayer.h"
using namespace llvm;
namespace xreate { namespace compilation {
TransformerSaturation::TransformerSaturation(llvm::BasicBlock* allocationBlock, TransformationsManager* manager)
: man(manager), blockAllocation(allocationBlock){
llvm::Type* tyInt1 = llvm::Type::getInt1Ty(llvm::getGlobalContext());
constTrue = llvm::ConstantInt::get(tyInt1, 1);
constFalse = llvm::ConstantInt::get(tyInt1, 0);
if (man->exists<TransformerSaturation>()){
oldInstance = man->update(this);
} else {
man->registerTransformer("break", this);
}
}
TransformerSaturation::~TransformerSaturation(){
if (oldInstance) {
man->update(oldInstance);
} else {
man->unregisterTransformer("break", this);
}
}
llvm::Value*
TransformerSaturation::transform(const Expression& expression, llvm::Value* raw, const Context& ctx){
processBreak(ctx);
return raw;
}
void
TransformerSaturation::processBreak(const Context& ctx){
allocateFlag(ctx);
//show the saturation flag
llvm::IRBuilder<>& builder = ctx.pass->man->llvm->builder;
builder.CreateStore(constTrue, flagSaturation, true);
}
void
TransformerSaturation::allocateFlag(const Context& ctx){
//allocation of saturation flag
llvm::Type* tyInt1 = llvm::Type::getInt1Ty(llvm::getGlobalContext());
IRBuilder<> builder(blockAllocation, blockAllocation->getFirstInsertionPt());
flagSaturation = builder.CreateAlloca(tyInt1, constTrue, "flagSaturation");
builder.CreateStore(constFalse, flagSaturation, true);
}
bool
TransformerSaturation::insertSaturationChecks(llvm::BasicBlock* blockContinue, llvm::BasicBlock* blockExit, const Context& ctx){
if (!flagSaturation) return false;
llvm::IRBuilder<>& builder = ctx.pass->man->llvm->builder;
builder.CreateCondBr(builder.CreateLoad(flagSaturation), blockExit, blockContinue);
return true;
}
} }
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