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The powers that be have decided that LLVM IR should now support 16-bit

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"half precision" floating-point with a first-class type.

This patch adds basic IR support (but not codegen support).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146786 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2011-12-17 00:04:22 +00:00
parent 2e1b0c0cd9
commit ce16339930
18 changed files with 123 additions and 56 deletions
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7
lib/Bitcode/Reader/BitcodeReader.cpp
View File

@ -565,6 +565,9 @@ bool BitcodeReader::ParseTypeTableBody() {
case bitc::TYPE_CODE_VOID: // VOID
ResultTy = Type::getVoidTy(Context);
break;
case bitc::TYPE_CODE_HALF: // HALF
ResultTy = Type::getHalfTy(Context);
break;
case bitc::TYPE_CODE_FLOAT: // FLOAT
ResultTy = Type::getFloatTy(Context);
break;
@ -1032,7 +1035,9 @@ bool BitcodeReader::ParseConstants() {
case bitc::CST_CODE_FLOAT: { // FLOAT: [fpval]
if (Record.empty())
return Error("Invalid FLOAT record");
if (CurTy->isFloatTy())
if (CurTy->isHalfTy())
V = ConstantFP::get(Context, APFloat(APInt(16, (uint16_t)Record[0])));
else if (CurTy->isFloatTy())
V = ConstantFP::get(Context, APFloat(APInt(32, (uint32_t)Record[0])));
else if (CurTy->isDoubleTy())
V = ConstantFP::get(Context, APFloat(APInt(64, Record[0])));

3
lib/Bitcode/Writer/BitcodeWriter.cpp
View File

@ -266,6 +266,7 @@ static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
switch (T->getTypeID()) {
default: llvm_unreachable("Unknown type!");
case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
case Type::HalfTyID: Code = bitc::TYPE_CODE_HALF; break;
case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break;
case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break;
case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break;
@ -826,7 +827,7 @@ static void WriteConstants(unsigned FirstVal, unsigned LastVal,
} else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
Code = bitc::CST_CODE_FLOAT;
Type *Ty = CFP->getType();
if (Ty->isFloatTy() || Ty->isDoubleTy()) {
if (Ty->isHalfTy() || Ty->isFloatTy() || Ty->isDoubleTy()) {
Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
} else if (Ty->isX86_FP80Ty()) {
// api needed to prevent premature destruction