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/** @file llvmutil.cpp
    @brief Implementations of various LLVM utility types and classes.
*/

#include "llvmutil.h"
#include "type.h"

const llvm::Type *LLVMTypes::VoidType = NULL;
const llvm::PointerType *LLVMTypes::VoidPointerType = NULL;
const llvm::Type *LLVMTypes::BoolType = NULL;
const llvm::Type *LLVMTypes::Int8Type = NULL;
const llvm::Type *LLVMTypes::Int16Type = NULL;
const llvm::Type *LLVMTypes::Int32Type = NULL;
const llvm::Type *LLVMTypes::Int32PointerType = NULL;
const llvm::Type *LLVMTypes::Int64Type = NULL;
const llvm::Type *LLVMTypes::Int64PointerType = NULL;
const llvm::Type *LLVMTypes::FloatType = NULL;
const llvm::Type *LLVMTypes::FloatPointerType = NULL;
const llvm::Type *LLVMTypes::DoubleType = NULL;

const llvm::VectorType *LLVMTypes::MaskType = NULL;
const llvm::VectorType *LLVMTypes::BoolVectorType = NULL;
const llvm::VectorType *LLVMTypes::Int1VectorType = NULL;
const llvm::VectorType *LLVMTypes::Int32VectorType = NULL;
const llvm::Type *LLVMTypes::Int32VectorPointerType = NULL;
const llvm::VectorType *LLVMTypes::Int64VectorType = NULL;
const llvm::Type *LLVMTypes::Int64VectorPointerType = NULL;
const llvm::VectorType *LLVMTypes::FloatVectorType = NULL;
const llvm::Type *LLVMTypes::FloatVectorPointerType = NULL;
const llvm::VectorType *LLVMTypes::DoubleVectorType = NULL;
const llvm::ArrayType *LLVMTypes::VoidPointerVectorType = NULL;

llvm::Constant *LLVMTrue = NULL;
llvm::Constant *LLVMFalse = NULL;
llvm::Constant *LLVMMaskAllOn = NULL;
llvm::Constant *LLVMMaskAllOff = NULL;


void
InitLLVMUtil(llvm::LLVMContext *ctx, Target target) {
    LLVMTypes::VoidType = llvm::Type::getVoidTy(*ctx);
    LLVMTypes::VoidPointerType = llvm::PointerType::get(llvm::Type::getInt8Ty(*ctx), 0);
    LLVMTypes::BoolType = llvm::Type::getInt1Ty(*ctx);
    LLVMTypes::Int8Type = llvm::Type::getInt8Ty(*ctx);
    LLVMTypes::Int16Type = llvm::Type::getInt16Ty(*ctx);
    LLVMTypes::Int32Type = llvm::Type::getInt32Ty(*ctx);
    LLVMTypes::Int32PointerType = llvm::PointerType::get(LLVMTypes::Int32Type, 0);
    LLVMTypes::Int64Type = llvm::Type::getInt64Ty(*ctx);
    LLVMTypes::Int64PointerType = llvm::PointerType::get(LLVMTypes::Int64Type, 0);
    LLVMTypes::FloatType = llvm::Type::getFloatTy(*ctx);
    LLVMTypes::FloatPointerType = llvm::PointerType::get(LLVMTypes::FloatType, 0);
    LLVMTypes::DoubleType = llvm::Type::getDoubleTy(*ctx);

    // Note that both the mask and bool vectors are vector of int32s
    // (not i1s).  LLVM ends up generating much better SSE code with
    // this representation.
    LLVMTypes::MaskType = LLVMTypes::BoolVectorType =
        llvm::VectorType::get(llvm::Type::getInt32Ty(*ctx), target.vectorWidth);

    LLVMTypes::Int1VectorType = 
        llvm::VectorType::get(llvm::Type::getInt1Ty(*ctx), target.vectorWidth);
    LLVMTypes::Int32VectorType = 
        llvm::VectorType::get(LLVMTypes::Int32Type, target.vectorWidth);
    LLVMTypes::Int32VectorPointerType = llvm::PointerType::get(LLVMTypes::Int32VectorType, 0);
    LLVMTypes::Int64VectorType = 
        llvm::VectorType::get(LLVMTypes::Int64Type, target.vectorWidth);
    LLVMTypes::Int64VectorPointerType = llvm::PointerType::get(LLVMTypes::Int64VectorType, 0);
    LLVMTypes::FloatVectorType = 
        llvm::VectorType::get(LLVMTypes::FloatType, target.vectorWidth);
    LLVMTypes::FloatVectorPointerType = llvm::PointerType::get(LLVMTypes::FloatVectorType, 0);
    LLVMTypes::DoubleVectorType = 
        llvm::VectorType::get(LLVMTypes::DoubleType, target.vectorWidth);
    LLVMTypes::VoidPointerVectorType = 
        llvm::ArrayType::get(LLVMTypes::VoidPointerType, target.vectorWidth);

    LLVMTrue = llvm::ConstantInt::getTrue(*ctx);
    LLVMFalse = llvm::ConstantInt::getFalse(*ctx);

    std::vector<llvm::Constant *> maskOnes;
    llvm::Constant *onMask = NULL;
    onMask = llvm::ConstantInt::get(llvm::Type::getInt32Ty(*ctx), -1,
                                    true /*signed*/); // 0xffffffff

    for (int i = 0; i < target.vectorWidth; ++i)
        maskOnes.push_back(onMask);
    LLVMMaskAllOn = llvm::ConstantVector::get(LLVMTypes::MaskType, maskOnes);

    std::vector<llvm::Constant *> maskZeros;
    llvm::Constant *offMask = NULL;
    offMask = llvm::ConstantInt::get(llvm::Type::getInt32Ty(*ctx), 0,
                                     true /*signed*/);

    for (int i = 0; i < target.vectorWidth; ++i)
        maskZeros.push_back(offMask);
    LLVMMaskAllOff = llvm::ConstantVector::get(LLVMTypes::MaskType, maskZeros);
}


llvm::ConstantInt *LLVMInt32(int32_t ival) {
    return llvm::ConstantInt::get(llvm::Type::getInt32Ty(*g->ctx), ival,
                                  true /*signed*/);
}


llvm::ConstantInt *
LLVMUInt32(uint32_t ival) {
    return llvm::ConstantInt::get(llvm::Type::getInt32Ty(*g->ctx), ival,
                                  false /*unsigned*/);
}


llvm::ConstantInt *
LLVMInt64(int64_t ival) {
    return llvm::ConstantInt::get(llvm::Type::getInt64Ty(*g->ctx), ival,
                                  true /*signed*/);
}


llvm::ConstantInt *
LLVMUInt64(uint64_t ival) {
    return llvm::ConstantInt::get(llvm::Type::getInt64Ty(*g->ctx), ival,
                                  false /*unsigned*/);
}


llvm::Constant *
LLVMFloat(float fval) {
    return llvm::ConstantFP::get(llvm::Type::getFloatTy(*g->ctx), fval);
}


llvm::Constant *
LLVMDouble(double dval) {
    return llvm::ConstantFP::get(llvm::Type::getDoubleTy(*g->ctx), dval);
}


llvm::Constant *
LLVMInt32Vector(int32_t ival) {
    llvm::Constant *v = LLVMInt32(ival);
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(v);
    return llvm::ConstantVector::get(LLVMTypes::Int32VectorType, vals);
}


llvm::Constant *
LLVMInt32Vector(const int32_t *ivec) {
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(LLVMInt32(ivec[i]));
    return llvm::ConstantVector::get(LLVMTypes::Int32VectorType, vals);
}


llvm::Constant *
LLVMUInt32Vector(uint32_t ival) {
    llvm::Constant *v = LLVMUInt32(ival);
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(v);
    return llvm::ConstantVector::get(LLVMTypes::Int32VectorType, vals);
}


llvm::Constant *
LLVMUInt32Vector(const uint32_t *ivec) {
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(LLVMUInt32(ivec[i]));
    return llvm::ConstantVector::get(LLVMTypes::Int32VectorType, vals);
}


llvm::Constant *
LLVMFloatVector(float fval) {
    llvm::Constant *v = LLVMFloat(fval);
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(v);
    return llvm::ConstantVector::get(LLVMTypes::FloatVectorType, vals);
}


llvm::Constant *
LLVMFloatVector(const float *fvec) {
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(LLVMFloat(fvec[i]));
    return llvm::ConstantVector::get(LLVMTypes::FloatVectorType, vals);
}


llvm::Constant *
LLVMDoubleVector(double dval) {
    llvm::Constant *v = LLVMDouble(dval);
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(v);
    return llvm::ConstantVector::get(LLVMTypes::DoubleVectorType, vals);
}


llvm::Constant *
LLVMDoubleVector(const double *dvec) {
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(LLVMDouble(dvec[i]));
    return llvm::ConstantVector::get(LLVMTypes::DoubleVectorType, vals);
}


llvm::Constant *
LLVMInt64Vector(int64_t ival) {
    llvm::Constant *v = LLVMInt64(ival);
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(v);
    return llvm::ConstantVector::get(LLVMTypes::Int64VectorType, vals);
}


llvm::Constant *
LLVMInt64Vector(const int64_t *ivec) {
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(LLVMInt64(ivec[i]));
    return llvm::ConstantVector::get(LLVMTypes::Int64VectorType, vals);
}


llvm::Constant *
LLVMUInt64Vector(uint64_t ival) {
    llvm::Constant *v = LLVMUInt64(ival);
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(v);
    return llvm::ConstantVector::get(LLVMTypes::Int64VectorType, vals);
}


llvm::Constant *
LLVMUInt64Vector(const uint64_t *ivec) {
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(LLVMUInt64(ivec[i]));
    return llvm::ConstantVector::get(LLVMTypes::Int64VectorType, vals);
}


llvm::Constant *
LLVMBoolVector(bool b) {
    llvm::Constant *v;
    if (LLVMTypes::BoolVectorType == LLVMTypes::Int32VectorType) 
        v = llvm::ConstantInt::get(LLVMTypes::Int32Type, b ? 0xffffffff : 0, 
                                   false /*unsigned*/);
    else {
        assert(LLVMTypes::BoolVectorType->getElementType() == 
               llvm::Type::getInt1Ty(*g->ctx));
        v = b ? LLVMTrue : LLVMFalse;
    }

    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i)
        vals.push_back(v);
    return llvm::ConstantVector::get(LLVMTypes::BoolVectorType, vals);
}


llvm::Constant *
LLVMBoolVector(const bool *bvec) {
    std::vector<llvm::Constant *> vals;
    for (int i = 0; i < g->target.vectorWidth; ++i) {
        llvm::Constant *v;
        if (LLVMTypes::BoolVectorType == LLVMTypes::Int32VectorType) 
            v = llvm::ConstantInt::get(LLVMTypes::Int32Type, bvec[i] ? 0xffffffff : 0, 
                                       false /*unsigned*/);
        else {
            assert(LLVMTypes::BoolVectorType->getElementType() == 
                   llvm::Type::getInt1Ty(*g->ctx));
            v = bvec[i] ? LLVMTrue : LLVMFalse;
        }

        vals.push_back(v);
    }
    return llvm::ConstantVector::get(LLVMTypes::BoolVectorType, vals);
}


const llvm::ArrayType *
LLVMPointerVectorType(const llvm::Type *t) {
    // NOTE: ArrayType, not VectorType
    return llvm::ArrayType::get(llvm::PointerType::get(t, 0), 
                                g->target.vectorWidth);
}