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Rewrite `StructLiteralExp::toElem` to store individual fields instead of generating a constant to fill the entire struct with a single `store`. This is much more efficient at compile time (fixing #320) and vastly reduces the size of the emitted code. Since LLVM no longer needs to keep the data for all fields in "registers" until the store happens, it should also be more efficient at run time in cases where the fields aren't assigned with constants. There's also some code clean-up by removing duplicated logic.
author Frits van Bommel <fvbommel wxs.nl>
date Sat, 06 Jun 2009 20:16:13 +0200
parents 087dafe5262a
children cc5fee7836dc
line wrap: on
line source

#include "gen/llvm.h"

#include "mtype.h"
#include "declaration.h"

#include "gen/complex.h"
#include "gen/tollvm.h"
#include "gen/llvmhelpers.h"
#include "gen/irstate.h"
#include "gen/dvalue.h"
#include "gen/logger.h"

//////////////////////////////////////////////////////////////////////////////////////////

const llvm::StructType* DtoComplexType(Type* type)
{
    Type* t = type->toBasetype();
    const LLType* base = DtoComplexBaseType(t);
    return llvm::StructType::get(base, base, NULL);
}

const LLType* DtoComplexBaseType(Type* t)
{
    TY ty = t->toBasetype()->ty;
    const LLType* base;
    if (ty == Tcomplex32) {
        return LLType::FloatTy;
    }
    else if (ty == Tcomplex64) {
        return LLType::DoubleTy;
    }
    else if (ty == Tcomplex80) {
        if ((global.params.cpu == ARCHx86) || (global.params.cpu == ARCHx86_64))
            return LLType::X86_FP80Ty;
        else
            return LLType::DoubleTy;
    }
    else {
        assert(0);
    }
}

//////////////////////////////////////////////////////////////////////////////////////////

LLConstant* DtoConstComplex(Type* _ty, long double re, long double im)
{
    TY ty = _ty->toBasetype()->ty;

    llvm::ConstantFP* fre;
    llvm::ConstantFP* fim;

    Type* base = 0;

    if (ty == Tcomplex32) {
        base = Type::tfloat32;
    }
    else if (ty == Tcomplex64) {
        base = Type::tfloat64;
    }
    else if (ty == Tcomplex80) {
        base = Type::tfloat80;
    }

    std::vector<LLConstant*> inits;
    inits.push_back(DtoConstFP(base, re));
    inits.push_back(DtoConstFP(base, im));

    return llvm::ConstantStruct::get(DtoComplexType(_ty), inits);
}

//////////////////////////////////////////////////////////////////////////////////////////

LLValue* DtoRealPart(DValue* val)
{
    assert(0);
    return gIR->ir->CreateExtractElement(val->getRVal(), DtoConstUint(0), "tmp");
}

//////////////////////////////////////////////////////////////////////////////////////////

LLValue* DtoImagPart(DValue* val)
{
    assert(0);
    return gIR->ir->CreateExtractElement(val->getRVal(), DtoConstUint(1), "tmp");
}

//////////////////////////////////////////////////////////////////////////////////////////

DValue* DtoComplex(Loc& loc, Type* to, DValue* val)
{
    const LLType* complexTy = DtoType(to);

    Type* baserety;
    Type* baseimty;
    TY ty = to->toBasetype()->ty;
    if (ty == Tcomplex32) {
        baserety = Type::tfloat32;
        baseimty = Type::timaginary32;
    } else if (ty == Tcomplex64) {
        baserety = Type::tfloat64;
        baseimty = Type::timaginary64;
    } else if (ty == Tcomplex80) {
        baserety = Type::tfloat80;
        baseimty = Type::timaginary80;
    }
    else {
        assert(0);
    }

    LLValue *re, *im;
    DtoGetComplexParts(loc, to, val, re, im);

    if(!re)
        re = LLConstant::getNullValue(DtoType(baserety));
    if(!im)
        im = LLConstant::getNullValue(DtoType(baseimty));

    LLValue* res = DtoAggrPair(complexTy, re, im);

    return new DImValue(to, res);
}

//////////////////////////////////////////////////////////////////////////////////////////

void DtoComplexSet(LLValue* c, LLValue* re, LLValue* im)
{
    DtoStore(re, DtoGEPi(c,0,0,"tmp"));
    DtoStore(im, DtoGEPi(c,0,1,"tmp"));
}

//////////////////////////////////////////////////////////////////////////////////////////

void DtoGetComplexParts(Loc& loc, Type* to, DValue* val, LLValue*& re, LLValue*& im)
{
    const LLType* base = DtoComplexBaseType(to);

    Type* baserety;
    Type* baseimty;
    TY ty = to->toBasetype()->ty;
    if (ty == Tcomplex32) {
        baserety = Type::tfloat32;
        baseimty = Type::timaginary32;
    } else if (ty == Tcomplex64) {
        baserety = Type::tfloat64;
        baseimty = Type::timaginary64;
    } else if (ty == Tcomplex80) {
        baserety = Type::tfloat80;
        baseimty = Type::timaginary80;
    }
    else {
        assert(0);
    }

    Type* t = val->getType()->toBasetype();

    if (t->iscomplex()) {
        DValue* v = DtoCastComplex(loc, val, to);
        if (to->iscomplex()) {
            re = gIR->ir->CreateExtractValue(v->getRVal(), 0, ".re_part");
            im = gIR->ir->CreateExtractValue(v->getRVal(), 1, ".im_part");
        } else
            DtoGetComplexParts(loc, to, v, re, im);
    }
    else if (t->isimaginary()) {
        re = NULL;
        im = DtoCastFloat(loc, val, baseimty)->getRVal();
    }
    else if (t->isfloating()) {
        re = DtoCastFloat(loc, val, baserety)->getRVal();
        im = NULL;
    }
    else if (t->isintegral()) {
        re = DtoCastInt(loc, val, baserety)->getRVal();
        im = NULL;
    }
    else {
        assert(0);
    }
}

//////////////////////////////////////////////////////////////////////////////////////////

DValue* DtoComplexAdd(Loc& loc, Type* type, DValue* lhs, DValue* rhs)
{
    llvm::Value *lhs_re, *lhs_im, *rhs_re, *rhs_im, *res_re, *res_im;

    // lhs values
    DtoGetComplexParts(loc, type, lhs, lhs_re, lhs_im);
    // rhs values
    DtoGetComplexParts(loc, type, rhs, rhs_re, rhs_im);

    // add up
    if(lhs_re && rhs_re)
        res_re = gIR->ir->CreateAdd(lhs_re, rhs_re, "tmp");
    else if(lhs_re)
        res_re = lhs_re;
    else // either rhs_re or no re at all (then use any)
        res_re = rhs_re;
    
    if(lhs_im && rhs_im)
        res_im = gIR->ir->CreateAdd(lhs_im, rhs_im, "tmp");
    else if(lhs_im)
        res_im = lhs_im;
    else // either rhs_im or no im at all (then use any)
        res_im = rhs_im;

    LLValue* res = DtoAggrPair(DtoType(type), res_re, res_im);
    return new DImValue(type, res);
}

//////////////////////////////////////////////////////////////////////////////////////////

DValue* DtoComplexSub(Loc& loc, Type* type, DValue* lhs, DValue* rhs)
{
    llvm::Value *lhs_re, *lhs_im, *rhs_re, *rhs_im, *res_re, *res_im;

    // lhs values
    DtoGetComplexParts(loc, type, lhs, lhs_re, lhs_im);
    // rhs values
    DtoGetComplexParts(loc, type, rhs, rhs_re, rhs_im);

    // add up
    if(lhs_re && rhs_re)
        res_re = gIR->ir->CreateSub(lhs_re, rhs_re, "tmp");
    else if(lhs_re)
        res_re = lhs_re;
    else // either rhs_re or no re at all (then use any)
        res_re = gIR->ir->CreateNeg(rhs_re, "neg");
    
    if(lhs_im && rhs_im)
        res_im = gIR->ir->CreateSub(lhs_im, rhs_im, "tmp");
    else if(lhs_im)
        res_im = lhs_im;
    else // either rhs_im or no im at all (then use any)
        res_im = gIR->ir->CreateNeg(rhs_im, "neg");

    LLValue* res = DtoAggrPair(DtoType(type), res_re, res_im);
    return new DImValue(type, res);
}

//////////////////////////////////////////////////////////////////////////////////////////

DValue* DtoComplexMul(Loc& loc, Type* type, DValue* lhs, DValue* rhs)
{
    llvm::Value *lhs_re, *lhs_im, *rhs_re, *rhs_im, *res_re, *res_im;

    // lhs values
    DtoGetComplexParts(loc, type, lhs, lhs_re, lhs_im);
    // rhs values
    DtoGetComplexParts(loc, type, rhs, rhs_re, rhs_im);

    // mul up
    llvm::Value *rere = NULL;
    llvm::Value *reim = NULL;
    llvm::Value *imre = NULL;
    llvm::Value *imim = NULL;

    if(lhs_re && rhs_re)
        rere = gIR->ir->CreateMul(lhs_re, rhs_re, "rere_mul");
    if(lhs_re && rhs_im)
        reim = gIR->ir->CreateMul(lhs_re, rhs_im, "reim_mul");
    if(lhs_im && rhs_re)
        imre = gIR->ir->CreateMul(lhs_im, rhs_re, "imre_mul");
    if(lhs_im && rhs_im)
        imim = gIR->ir->CreateMul(lhs_im, rhs_im, "imim_mul");

    if(rere && imim)
        res_re = gIR->ir->CreateSub(rere, imim, "rere_imim_sub");
    else if(rere)
        res_re = rere;
    else if(imim)
        res_re = gIR->ir->CreateNeg(imim, "imim_neg");
    else
        res_re = lhs_re ? rhs_re : lhs_re; // null!

    if(reim && imre)
        res_im = gIR->ir->CreateAdd(reim, imre, "reim_imre_add");
    else if(reim)
        res_im = reim;
    else if(imre)
        res_im = imre;
    else
        res_im = lhs_re ? rhs_im : lhs_re; // null!

    LLValue* res = DtoAggrPair(DtoType(type), res_re, res_im);
    return new DImValue(type, res);
}

//////////////////////////////////////////////////////////////////////////////////////////

DValue* DtoComplexDiv(Loc& loc, Type* type, DValue* lhs, DValue* rhs)
{
    llvm::Value *lhs_re, *lhs_im, *rhs_re, *rhs_im, *res_re, *res_im;

    // lhs values
    DtoGetComplexParts(loc, type, lhs, lhs_re, lhs_im);
    // rhs values
    DtoGetComplexParts(loc, type, rhs, rhs_re, rhs_im);

    // if divisor is only real, division is simple
    if(rhs_re && !rhs_im) {
        if(lhs_re)
            res_re = gIR->ir->CreateFDiv(lhs_re, rhs_re, "re_divby_re");
        else
            res_re = lhs_re;
        if(lhs_im)
            res_im = gIR->ir->CreateFDiv(lhs_im, rhs_re, "im_divby_re");
        else
            res_im = lhs_im;
    }
    // if divisor is only imaginary, division is simple too
    else if(!rhs_re && rhs_im) {
        if(lhs_re)
            res_im = gIR->ir->CreateNeg(gIR->ir->CreateFDiv(lhs_re, rhs_im, "re_divby_im"), "neg");
        else
            res_im = lhs_re;
        if(lhs_im)
            res_re = gIR->ir->CreateFDiv(lhs_im, rhs_im, "im_divby_im");
        else
            res_re = lhs_im;
    }
    // full division
    else {
        llvm::Value *tmp1, *tmp2, *denom;

        if(lhs_re && lhs_im) {
            tmp1 = gIR->ir->CreateMul(lhs_re, rhs_re, "rere");
            tmp2 = gIR->ir->CreateMul(lhs_im, rhs_im, "imim");
            res_re = gIR->ir->CreateAdd(tmp1, tmp2, "rere_plus_imim");

            tmp1 = gIR->ir->CreateMul(lhs_re, rhs_im, "reim");
            tmp2 = gIR->ir->CreateMul(lhs_im, rhs_re, "imre");
            res_im = gIR->ir->CreateSub(tmp2, tmp1, "imre_sub_reim");
        }
        else if(lhs_re) {
            res_re = gIR->ir->CreateMul(lhs_re, rhs_re, "rere");

            res_im = gIR->ir->CreateMul(lhs_re, rhs_im, "reim");
            res_im = gIR->ir->CreateNeg(res_im);
        }
        else if(lhs_im) {
            res_re = gIR->ir->CreateMul(lhs_im, rhs_im, "imim");
            res_im = gIR->ir->CreateMul(lhs_im, rhs_re, "imre");
        }
        else
            assert(0 && "lhs has neither real nor imaginary part");

        tmp1 = gIR->ir->CreateMul(rhs_re, rhs_re, "rhs_resq");
        tmp2 = gIR->ir->CreateMul(rhs_im, rhs_im, "rhs_imsq");
        denom = gIR->ir->CreateAdd(tmp1, tmp2, "denom");

        res_re = gIR->ir->CreateFDiv(res_re, denom, "res_re");
        res_im = gIR->ir->CreateFDiv(res_im, denom, "res_im");
    }

    LLValue* res = DtoAggrPair(DtoType(type), res_re, res_im);
    return new DImValue(type, res);
}

//////////////////////////////////////////////////////////////////////////////////////////

DValue* DtoComplexNeg(Loc& loc, Type* type, DValue* val)
{
    llvm::Value *a, *b, *re, *im;

    // values
    DtoGetComplexParts(loc, type, val, a, b);

    // neg up
    assert(a && b);
    re = gIR->ir->CreateNeg(a, "tmp");
    im = gIR->ir->CreateNeg(b, "tmp");

    LLValue* res = DtoAggrPair(DtoType(type), re, im);
    return new DImValue(type, res);
}

//////////////////////////////////////////////////////////////////////////////////////////

LLValue* DtoComplexEquals(Loc& loc, TOK op, DValue* lhs, DValue* rhs)
{
    Type* type = lhs->getType();

    llvm::Value *lhs_re, *lhs_im, *rhs_re, *rhs_im, *res_re, *res_im;

    // lhs values
    DtoGetComplexParts(loc, type, lhs, lhs_re, lhs_im);
    // rhs values
    DtoGetComplexParts(loc, type, rhs, rhs_re, rhs_im);

    // select predicate
    llvm::FCmpInst::Predicate cmpop;
    if (op == TOKequal)
        cmpop = llvm::FCmpInst::FCMP_OEQ;
    else
        cmpop = llvm::FCmpInst::FCMP_UNE;

    // (l.re==r.re && l.im==r.im) or (l.re!=r.re || l.im!=r.im)
    LLValue* b1 = new llvm::FCmpInst(cmpop, lhs_re, rhs_re, "tmp", gIR->scopebb());
    LLValue* b2 = new llvm::FCmpInst(cmpop, lhs_im, rhs_im, "tmp", gIR->scopebb());

    if (op == TOKequal)
        return gIR->ir->CreateAnd(b1,b2,"tmp");
    else
        return gIR->ir->CreateOr(b1,b2,"tmp");
}

//////////////////////////////////////////////////////////////////////////////////////////

DValue* DtoCastComplex(Loc& loc, DValue* val, Type* _to)
{
    Type* to = _to->toBasetype();
    Type* vty = val->getType()->toBasetype();
    if (to->iscomplex()) {
        if (vty->size() == to->size())
            return val;

        llvm::Value *re, *im;
        DtoGetComplexParts(loc, val->getType(), val, re, im);
        const LLType* toty = DtoComplexBaseType(to);

        if (to->size() < vty->size()) {
            re = gIR->ir->CreateFPTrunc(re, toty, "tmp");
            im = gIR->ir->CreateFPTrunc(im, toty, "tmp");
        }
        else {
            re = gIR->ir->CreateFPExt(re, toty, "tmp");
            im = gIR->ir->CreateFPExt(im, toty, "tmp");
        }

        LLValue* pair = DtoAggrPair(DtoType(_to), re, im);
        return new DImValue(_to, pair);
    }
    else if (to->isimaginary()) {
        // FIXME: this loads both values, even when we only need one
        LLValue* v = val->getRVal();
        LLValue* impart = gIR->ir->CreateExtractValue(v, 1, ".im_part");
        DImValue* im = new DImValue(to, impart);
        return DtoCastFloat(loc, im, to);
    }
    else if (to->ty == Tbool) {
        return new DImValue(_to, DtoComplexEquals(loc, TOKnotequal, val, DtoNullValue(vty)));
    }
    else if (to->isfloating() || to->isintegral()) {
        // FIXME: this loads both values, even when we only need one
        LLValue* v = val->getRVal();
        LLValue* repart = gIR->ir->CreateExtractValue(v, 0, ".re_part");
        Type *extractty;
        if (vty->ty == Tcomplex32) {
            extractty = Type::tfloat32;
        } else if (vty->ty == Tcomplex64) {
            extractty = Type::tfloat64;
        } else if (vty->ty == Tcomplex80) {
            extractty = Type::tfloat80;
        }
        DImValue* re = new DImValue(extractty, repart);
        return DtoCastFloat(loc, re, to);
    }
    else
        error(loc, "Don't know how to cast %s to %s", vty->toChars(), to->toChars());
}