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| author | Justin Lebar <jlebar@google.com> | 2016-09-11 01:38:58 +0000 |
|---|---|---|
| committer | Justin Lebar <jlebar@google.com> | 2016-09-11 01:38:58 +0000 |
| commit | adbf09e8cfd3aa6bb104f45bf5f39e4e8578d2f8 (patch) | |
| tree | 462f51cead1ea3e5f264f3c84af6e5e94aceda72 /llvm/lib/Target/SystemZ | |
| parent | 4fab7454c5480bc68732ba456bb3aff3ffdedfa0 (diff) | |
| download | bcm5719-llvm-adbf09e8cfd3aa6bb104f45bf5f39e4e8578d2f8.tar.gz bcm5719-llvm-adbf09e8cfd3aa6bb104f45bf5f39e4e8578d2f8.zip | |
[CodeGen] Split out the notions of MI invariance and MI dereferenceability.
Summary:
An IR load can be invariant, dereferenceable, neither, or both. But
currently, MI's notion of invariance is IR-invariant &&
IR-dereferenceable.
This patch splits up the notions of invariance and dereferenceability at
the MI level. It's NFC, so adds some probably-unnecessary
"is-dereferenceable" checks, which we can remove later if desired.
Reviewers: chandlerc, tstellarAMD
Subscribers: jholewinski, arsenm, nemanjai, llvm-commits
Differential Revision: https://reviews.llvm.org/D23371
llvm-svn: 281151
Diffstat (limited to 'llvm/lib/Target/SystemZ')
| -rw-r--r-- | llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp b/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp index 5677fdaaff2..1290fc1cb23 100644 --- a/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp +++ b/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp @@ -1176,7 +1176,7 @@ bool SystemZDAGToDAGISel::canUseBlockOperation(StoreSDNode *Store, return false; // There's no chance of overlap if the load is invariant. - if (Load->isInvariant()) + if (Load->isInvariant() && Load->isDereferenceable()) return true; // Otherwise we need to check whether there's an alias. |
