diff options
| author | Shuxin Yang <shuxin.llvm@gmail.com> | 2013-03-06 17:48:48 +0000 |
|---|---|---|
| committer | Shuxin Yang <shuxin.llvm@gmail.com> | 2013-03-06 17:48:48 +0000 |
| commit | 985dac65791b9f6f631bdd51c18fe66592a67469 (patch) | |
| tree | 9265b2aa99cf3753755535652b74ad4683c4bcaf /lib/CodeGen/MachineTraceMetrics.cpp | |
| parent | 186d8a3d67ccd2b2401c5d7d4e2cc15c4d1fdeae (diff) | |
Memory Dependence Analysis (not mem-dep test) take advantage of "invariant.load" metadata.
The "invariant.load" metadata indicates the memory unit being accessed is immutable.
A load annotated with this metadata can be moved across any store.
As I am not sure if it is legal to move such loads across barrier/fence, this
change dose not allow such transformation.
rdar://11311484
Thank Arnold for code review.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176562 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineTraceMetrics.cpp')
0 files changed, 0 insertions, 0 deletions