Lang Hames 558b52b517 [ORC] Change handling for SymbolStringPtr tombstones and empty keys. ...

SymbolStringPtr used to use nullptr as its empty value and (since it performed
ref-count operations on any non-nullptr) a pointer to a special pool-entry
instance as its tombstone.

This commit changes the scheme to use two invalid pointer values as the empty
and tombstone values, and broadens the ref-count guard to prevent ref-counting
operations from being performed on these pointers. This should improve the
performance of SymbolStringPtrs used in DenseMaps/DenseSets, as ref counting
operations will no longer be performed on the tombstone.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@360925 91177308-0d34-0410-b5e6-96231b3b80d8

2019-05-16 18:29:34 +00:00

..

llvm

[ORC] Change handling for SymbolStringPtr tombstones and empty keys.

2019-05-16 18:29:34 +00:00

llvm-c

[llvm-c] Make LLVMGetStringErrorTypeId a proper prototype

2019-05-06 06:42:06 +00:00