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Read/write global variable alignments if present

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24216 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2005-11-06 07:11:04 +00:00
parent abdf0f5327
commit 8eb52dd734
2 changed files with 37 additions and 6 deletions
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12
lib/Bytecode/Reader/Reader.cpp
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@@ -1903,6 +1903,17 @@ void BytecodeReader::ParseModuleGlobalInfo() {
bool isConstant = VarType & 1;
bool hasInitializer = VarType & 2;
GlobalValue::LinkageTypes Linkage;
unsigned Alignment = 0;
// An extension word is present when linkage = 3 (internal) and hasinit = 0.
if (LinkageID == 3 && !hasInitializer) {
unsigned ExtWord = read_vbr_uint();
// The extension word has this format: bit 0 = has initializer, bit 1-3 =
// linkage, bit 4-8 = alignment (log2), bits 10+ = future use.
hasInitializer = ExtWord & 1;
LinkageID = (ExtWord >> 1) & 7;
Alignment = (1 << ((ExtWord >> 4) & 31)) >> 1;
}
switch (LinkageID) {
case 0: Linkage = GlobalValue::ExternalLinkage; break;
@@ -1930,6 +1941,7 @@ void BytecodeReader::ParseModuleGlobalInfo() {
// Create the global variable...
GlobalVariable *GV = new GlobalVariable(ElTy, isConstant, Linkage,
0, "", TheModule);
GV->setAlignment(Alignment);
insertValue(GV, SlotNo, ModuleValues);
unsigned initSlot = 0;