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Bytecode format for LLVM 1.2 no longer explicitly encodes zeros in primitive

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type planes.  This saves about 5k on 176.gcc, and is needed for a subsequent
patch of mine I'm working on.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10908 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-01-17 23:25:43 +00:00
parent a55e040623
commit 80b97343ec
5 changed files with 38 additions and 13 deletions
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22
lib/Bytecode/Reader/Reader.cpp
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@ -66,10 +66,17 @@ const Type *BytecodeParser::getType(unsigned ID) {
throw std::string("Illegal type reference!");
}
static inline bool hasImplicitNull(unsigned TyID, bool EncodesPrimitiveZeros) {
if (!EncodesPrimitiveZeros)
return TyID != Type::LabelTyID && TyID != Type::TypeTyID &&
TyID != Type::VoidTyID;
return TyID >= Type::FirstDerivedTyID;
}
unsigned BytecodeParser::insertValue(Value *Val, unsigned type,
ValueTable &ValueTab) {
assert((!isa<Constant>(Val) || Val->getType()->isPrimitiveType() ||
!cast<Constant>(Val)->isNullValue()) &&
assert((!isa<Constant>(Val) || !cast<Constant>(Val)->isNullValue()) ||
!hasImplicitNull(type, hasExplicitPrimitiveZeros) &&
"Cannot read null values from bytecode!");
assert(type != Type::TypeTyID && "Types should never be insertValue'd!");
@ -88,13 +95,12 @@ unsigned BytecodeParser::insertValue(Value *Val, unsigned type,
return ValueTab[type]->size()-1 + HasOffset;
}
Value *BytecodeParser::getValue(unsigned type, unsigned oNum, bool Create) {
assert(type != Type::TypeTyID && "getValue() cannot get types!");
assert(type != Type::LabelTyID && "getValue() cannot get blocks!");
unsigned Num = oNum;
if (type >= FirstDerivedTyID) {
if (hasImplicitNull(type, hasExplicitPrimitiveZeros)) {
if (Num == 0)
return Constant::getNullValue(getType(type));
--Num;
@ -536,6 +542,7 @@ void BytecodeParser::ParseVersionInfo(const unsigned char *&Buf,
hasOldStyleVarargs = false;
hasVarArgCallPadding = false;
hasInconsistentModuleGlobalInfo = false;
hasExplicitPrimitiveZeros = false;
FirstDerivedTyID = 14;
switch (RevisionNum) {
@ -545,16 +552,15 @@ void BytecodeParser::ParseVersionInfo(const unsigned char *&Buf,
hasExtendedLinkageSpecs = false;
hasOldStyleVarargs = true;
hasVarArgCallPadding = true;
hasInconsistentModuleGlobalInfo = true;
break;
// FALL THROUGH
case 0: // LLVM 1.0, 1.1 release version
// Compared to rev #2, we added support for weak linkage, a more dense
// encoding, and better varargs support.
// Base LLVM 1.0 bytecode format.
hasInconsistentModuleGlobalInfo = true;
break;
hasExplicitPrimitiveZeros = true;
// FALL THROUGH
case 1: // LLVM 1.2 release version
// LLVM 1.2 added explicit support for emitting strings efficiently.