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Be pessimistic in computing the buffer size when aligning.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50008 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nicolas Geoffray 2008-04-20 23:39:44 +00:00
parent 546e36a2c1
commit 580631a73a
2 changed files with 11 additions and 7 deletions
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3
lib/ExecutionEngine/JIT/JITDwarfEmitter.cpp
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@ -664,7 +664,8 @@ unsigned JITDwarfEmitter::GetDwarfTableSizeInBytes(MachineFunction& F,
/// the new value.
static unsigned RoundUpToAlign(unsigned FinalSize, unsigned Alignment) {
if (Alignment == 0) Alignment = 1;
return (FinalSize + Alignment - 1) & ~(Alignment - 1);
// Since we do not know where the buffer will be allocated, be pessimistic.
return FinalSize + Alignment;
}
unsigned

15
lib/ExecutionEngine/JIT/JITEmitter.cpp
View File

@ -623,9 +623,10 @@ static unsigned GetJumpTableSizeInBytes(MachineJumpTableInfo *MJTI) {
return NumEntries * EntrySize;
}
static void AddAlignment(uintptr_t& Size, unsigned Alignment) {
static uintptr_t RoundUpToAlign(uintptr_t Size, unsigned Alignment) {
if (Alignment == 0) Alignment = 1;
Size = (Size + Alignment - 1) & (Alignment - 1);
// Since we do not know where the buffer will be allocated, be pessimistic.
return Size + Alignment;
}
void JITEmitter::startFunction(MachineFunction &F) {
@ -636,22 +637,24 @@ void JITEmitter::startFunction(MachineFunction &F) {
MachineConstantPool *MCP = F.getConstantPool();
// Ensure the constant pool/jump table info is at least 4-byte aligned.
AddAlignment(ActualSize, 16);
ActualSize = RoundUpToAlign(ActualSize, 16);
// Add the alignment of the constant pool
AddAlignment(ActualSize, 1 << MCP->getConstantPoolAlignment());
ActualSize = RoundUpToAlign(ActualSize,
1 << MCP->getConstantPoolAlignment());
// Add the constant pool size
ActualSize += GetConstantPoolSizeInBytes(MCP);
// Add the aligment of the jump table info
AddAlignment(ActualSize, MJTI->getAlignment());
ActualSize = RoundUpToAlign(ActualSize, MJTI->getAlignment());
// Add the jump table size
ActualSize += GetJumpTableSizeInBytes(MJTI);
// Add the alignment for the function
AddAlignment(ActualSize, std::max(F.getFunction()->getAlignment(), 8U));
ActualSize = RoundUpToAlign(ActualSize,
std::max(F.getFunction()->getAlignment(), 8U));
// Add the function size
ActualSize += TII->GetFunctionSizeInBytes(F);