mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 19:23:23 +01:00
fix and concisify intinsic lowering for ctpop. Unfortunately, this code
looks completely untested. :( llvm-svn: 21873
This commit is contained in:
Chris Lattner
parent
eeeaf45bba
commit
330f44f3b6
@ -127,6 +127,40 @@ void DefaultIntrinsicLowering::AddPrototypes(Module &M) {
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}
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}
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/// LowerCTPOP - Emit the code to lower ctpop of V before the specified
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/// instruction.
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static Value *LowerCTPOP(Value *V, Instruction *IP) {
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assert(V->getType()->isInteger() && "Can't ctpop a non-integer type!");
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unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
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static const uint64_t MaskValues[6] = {
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0x5555555555555555ULL, 0x3333333333333333ULL,
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0x0F0F0F0F0F0F0F0FULL, 0x00FF00FF00FF00FFULL,
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0x0000FFFF0000FFFFULL, 0x00000000FFFFFFFFULL
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};
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const Type *DestTy = V->getType();
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// Force to unsigned so that the shift rights are logical.
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if (DestTy->isSigned())
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V = new CastInst(V, DestTy->getUnsignedVersion(), V->getName(), IP);
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for (unsigned i = 1, ct = 0; i != BitSize; i <<= 1, ++ct) {
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Value *MaskCst =
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ConstantExpr::getCast(ConstantUInt::get(Type::ULongTy,
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MaskValues[ct]), V->getType());
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Value *LHS = BinaryOperator::createAnd(V, MaskCst, "cppop.and1", IP);
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Value *VShift = new ShiftInst(Instruction::Shr, V,
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ConstantInt::get(Type::UByteTy, i), "ctpop.sh", IP);
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Value *RHS = BinaryOperator::createAnd(VShift, MaskCst, "cppop.and2", IP);
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V = BinaryOperator::createAdd(LHS, RHS, "ctpop.step", IP);
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}
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if (V->getType() != DestTy)
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V = new CastInst(V, DestTy, V->getName(), IP);
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return V;
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}
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void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
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Function *Callee = CI->getCalledFunction();
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assert(Callee && "Cannot lower an indirect call!");
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@ -172,157 +206,10 @@ void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
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AbortFCache);
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break;
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}
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case Intrinsic::ctpop: {
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Value *Src = CI->getOperand(1);
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switch (CI->getOperand(0)->getType()->getTypeID())
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{
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case Type::SByteTyID:
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case Type::UByteTyID:
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{
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Value* SA = ConstantUInt::get(Type::UByteTy, 1);
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Value* MA = ConstantUInt::get(Type::UIntTy, 0x55);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 2);
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MA = ConstantUInt::get(Type::UIntTy, 0x33);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 4);
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MA = ConstantUInt::get(Type::UIntTy, 0x0F);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA), "ctpop");
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}
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break;
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case Type::ShortTyID:
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case Type::UShortTyID:
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{
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Value* SA = ConstantUInt::get(Type::UByteTy, 1);
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Value* MA = ConstantUInt::get(Type::UIntTy, 0x5555);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 2);
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MA = ConstantUInt::get(Type::UIntTy, 0x3333);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 4);
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MA = ConstantUInt::get(Type::UIntTy, 0x0F0F);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 8);
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MA = ConstantUInt::get(Type::UIntTy, 0x00FF);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA), "ctpop");
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}
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break;
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case Type::IntTyID:
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case Type::UIntTyID:
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{
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Value* SA = ConstantUInt::get(Type::UByteTy, 1);
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Value* MA = ConstantUInt::get(Type::UIntTy, 0x55555555);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 2);
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MA = ConstantUInt::get(Type::UIntTy, 0x33333333);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 4);
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MA = ConstantUInt::get(Type::UIntTy, 0x0F0F0F0F);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 8);
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MA = ConstantUInt::get(Type::UIntTy, 0x00FF00FF);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 8);
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MA = ConstantUInt::get(Type::UIntTy, 0x0000FFFF);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA), "ctpop");
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}
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break;
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case Type::LongTyID:
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case Type::ULongTyID:
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{
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Value* SA = ConstantUInt::get(Type::UByteTy, 1);
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Value* MA = ConstantUInt::get(Type::ULongTy, 0x5555555555555555ULL);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 2);
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MA = ConstantUInt::get(Type::ULongTy, 0x3333333333333333ULL);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 4);
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MA = ConstantUInt::get(Type::ULongTy, 0x0F0F0F0F0F0F0F0FULL);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 8);
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MA = ConstantUInt::get(Type::ULongTy, 0x00FF00FF00FF00FFULL);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA));
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SA = ConstantUInt::get(Type::UByteTy, 16);
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MA = ConstantUInt::get(Type::ULongTy, 0x00000000FFFFFFFFULL);
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Src = BinaryOperator::create(Instruction::Add,
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BinaryOperator::create(Instruction::And, Src, MA),
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BinaryOperator::create(Instruction::And,
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new ShiftInst(Instruction::Shr, Src, SA),
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MA), "ctpop");
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}
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break;
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default:
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abort();
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}
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CI->replaceAllUsesWith(Src);
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case Intrinsic::ctpop:
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CI->replaceAllUsesWith(LowerCTPOP(CI->getOperand(1), CI));
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break;
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}
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case Intrinsic::ctlz: {
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Value *Src = CI->getOperand(1);
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Value* SA;
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@ -331,39 +218,46 @@ void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
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case Type::LongTyID:
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case Type::ULongTyID:
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SA = ConstantUInt::get(Type::UByteTy, 32);
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Src = BinaryOperator::create(Instruction::Or, Src, new ShiftInst(Instruction::Shr, Src, SA));
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Src = BinaryOperator::createOr(Src, new ShiftInst(Instruction::Shr, Src,
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SA, "", CI), "", CI);
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case Type::IntTyID:
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case Type::UIntTyID:
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SA = ConstantUInt::get(Type::UByteTy, 16);
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Src = BinaryOperator::create(Instruction::Or, Src, new ShiftInst(Instruction::Shr, Src, SA));
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Src = BinaryOperator::createOr(Src, new ShiftInst(Instruction::Shr,
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Src, SA, "", CI),
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"", CI);
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case Type::ShortTyID:
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case Type::UShortTyID:
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SA = ConstantUInt::get(Type::UByteTy, 8);
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Src = BinaryOperator::create(Instruction::Or, Src, new ShiftInst(Instruction::Shr, Src, SA));
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Src = BinaryOperator::createOr(Src, new ShiftInst(Instruction::Shr,
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Src, SA, "", CI),
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"", CI);
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default:
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SA = ConstantUInt::get(Type::UByteTy, 1);
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Src = BinaryOperator::create(Instruction::Or, Src, new ShiftInst(Instruction::Shr, Src, SA));
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Src = BinaryOperator::createOr(Src, new ShiftInst(Instruction::Shr, Src,
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SA, "", CI), "", CI);
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SA = ConstantUInt::get(Type::UByteTy, 2);
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Src = BinaryOperator::create(Instruction::Or, Src, new ShiftInst(Instruction::Shr, Src, SA));
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Src = BinaryOperator::createOr(Src, new ShiftInst(Instruction::Shr, Src,
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SA, "", CI), "", CI);
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SA = ConstantUInt::get(Type::UByteTy, 4);
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Src = BinaryOperator::create(Instruction::Or, Src, new ShiftInst(Instruction::Shr, Src, SA));
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Src = BinaryOperator::createOr(Src, new ShiftInst(Instruction::Shr, Src,
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SA, "", CI), "", CI);
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};
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Src = BinaryOperator::createNot(Src);
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Src = BinaryOperator::createNot(Src, "", CI);
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Src = new CallInst(new Function(CI->getCalledFunction()->getFunctionType(),
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CI->getCalledFunction()->getLinkage(),
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"llvm.ctpop"), Src);
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Src = LowerCTPOP(Src, CI);
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CI->replaceAllUsesWith(Src);
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break;
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}
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case Intrinsic::cttz: {
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Value *Src = CI->getOperand(1);
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Src = BinaryOperator::create(Instruction::And, BinaryOperator::createNot(Src),
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BinaryOperator::create(Instruction::Sub, Src,
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ConstantUInt::get(CI->getOperand(0)->getType(), 1)));
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Src = new CallInst(new Function(CI->getCalledFunction()->getFunctionType(),
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CI->getCalledFunction()->getLinkage(),
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"llvm.ctpop"), Src);
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Value *NotSrc = BinaryOperator::createNot(Src, Src->getName()+".not", CI);
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Src = BinaryOperator::createAnd(NotSrc,
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BinaryOperator::createSub(Src,
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ConstantUInt::get(CI->getOperand(0)->getType(), 1), "", CI));
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Src = LowerCTPOP(Src, CI);
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CI->replaceAllUsesWith(Src);
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break;
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}
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@ -442,5 +336,5 @@ void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
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assert(CI->use_empty() &&
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"Lowering should have eliminated any uses of the intrinsic call!");
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CI->getParent()->getInstList().erase(CI);
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CI->eraseFromParent();
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}
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