Encode MCSymbol alignment as log2(align).

Given that alignments are always powers of 2, just encode it this way.

This matches how we encode alignment on IR GlobalValue's for example.

This compresses the CommonAlign member down to 5 bits which allows it
to pack better with the surrounding fields.

Reviewed by Duncan Exon Smith.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241189 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper
2015-07-01 21:07:03 +00:00
parent 8a1df9b25f
commit f77ca9f85f
2 changed files with 21 additions and 9 deletions

View File

@ -19,6 +19,8 @@ using namespace llvm;
// Sentinel value for the absolute pseudo section.
MCSection *MCSymbol::AbsolutePseudoSection = reinterpret_cast<MCSection *>(1);
const unsigned MCSymbol::NumCommonAlignmentBits;
void *MCSymbol::operator new(size_t s, const StringMapEntry<bool> *Name,
MCContext &Ctx) {
// We may need more space for a Name to account for alignment. So allocate