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| author | Diego Novillo <dnovillo@google.com> | 2013-05-24 12:26:52 +0000 |
|---|---|---|
| committer | Diego Novillo <dnovillo@google.com> | 2013-05-24 12:26:52 +0000 |
| commit | 77226a03dca98e6237c1068f2652fe41bea7b687 (patch) | |
| tree | 3a8cb78a478d9e82735484091ae29647e3ec9002 /docs | |
| parent | 49a6a8d8f2994249c81b7914b07015714748a55c (diff) | |
| download | llvm-77226a03dca98e6237c1068f2652fe41bea7b687.tar.gz llvm-77226a03dca98e6237c1068f2652fe41bea7b687.tar.bz2 llvm-77226a03dca98e6237c1068f2652fe41bea7b687.tar.xz | |
Add a new function attribute 'cold' to functions.
Other than recognizing the attribute, the patch does little else.
It changes the branch probability analyzer so that edges into
blocks postdominated by a cold function are given low weight.
Added analysis and code generation tests. Added documentation for the
new attribute.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182638 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/LangRef.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/LangRef.rst b/docs/LangRef.rst index 5e32eba7f7..e902159bf0 100644 --- a/docs/LangRef.rst +++ b/docs/LangRef.rst @@ -812,6 +812,11 @@ example: This attribute indicates that the inliner should attempt to inline this function into callers whenever possible, ignoring any active inlining size threshold for this caller. +``cold`` + This attribute indicates that this function is rarely called. When + computing edge weights, basic blocks post-dominated by a cold + function call are also considered to be cold; and, thus, given low + weight. ``nonlazybind`` This attribute suppresses lazy symbol binding for the function. This may make calls to the function faster, at the cost of extra program |