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Read 64 bits at a time in the bitcode reader.

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The reading of 64 bit values could still be optimized, but at least this cuts
down on the number of virtual calls to fetch more data.

llvm-svn: 221865
This commit is contained in:
Rafael Espindola
2014-11-13 07:23:22 +00:00
parent c77f5fa4f4
commit c11bd4229c
3 changed files with 17 additions and 20 deletions
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7
llvm/lib/Support/StreamingMemoryObject.cpp
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@@ -90,13 +90,12 @@ uint64_t StreamingMemoryObject::getExtent() const {
uint64_t StreamingMemoryObject::readBytes(uint8_t *Buf, uint64_t Size,
uint64_t Address) const {
fetchToPos(Address + Size - 1);
uint64_t BufferSize = Bytes.size() - BytesSkipped;
if (Address >= BufferSize)
if (Address >= BytesRead)
return 0;
uint64_t End = Address + Size;
if (End > BufferSize)
End = BufferSize;
if (End > BytesRead)
End = BytesRead;
Size = End - Address;
assert(Size >= 0);
memcpy(Buf, &Bytes[Address + BytesSkipped], Size);