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AsmPrinter: Convert DIE::Values to a linked list

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Change `DIE::Values` to a singly linked list, where each node is
allocated on a `BumpPtrAllocator`.  In order to support `push_back()`,
the list is circular, and points at the tail element instead of the
head.  I abstracted the core list logic out to `IntrusiveBackList` so
that it can be reused for `DIE::Children`, which also cares about
`push_back()`.

This drops llc memory usage from 799 MB down to 735 MB, about 8%.

(I'm looking at `llc` memory usage on `verify-uselistorder.lto.opt.bc`;
see r236629 for details.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240733 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-06-25 23:46:41 +00:00
parent d1ceba0333
commit 73e3fb6ba8
11 changed files with 463 additions and 268 deletions
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2
lib/CodeGen/AsmPrinter/DIEHash.cpp
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@ -263,7 +263,7 @@ void DIEHash::hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
// Hash all of the values in a block like set of values. This assumes that
// all of the data is going to be added as integers.
void DIEHash::hashBlockData(const DIE::value_range &Values) {
void DIEHash::hashBlockData(const DIE::const_value_range &Values) {
for (const auto &V : Values)
Hash.update((uint64_t)V.getDIEInteger().getValue());
}