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| author | Chris Lattner <sabre@nondot.org> | 2006-02-03 21:25:23 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-02-03 21:25:23 +0000 |
| commit | 277462e20fac9f67dcc5a396b56bd9cad3cee1c7 (patch) | |
| tree | 1e309fd50f0f2ca561536e2b3472dc01510ecdde /llvm/lib | |
| parent | f68fd20286636468cc1588b8f103350070509ed2 (diff) | |
| download | bcm5719-llvm-277462e20fac9f67dcc5a396b56bd9cad3cee1c7.tar.gz bcm5719-llvm-277462e20fac9f67dcc5a396b56bd9cad3cee1c7.zip | |
add a note
llvm-svn: 25942
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/README.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Target/README.txt b/llvm/lib/Target/README.txt index 2a0d8e121ca..32a2e7ccbd5 100644 --- a/llvm/lib/Target/README.txt +++ b/llvm/lib/Target/README.txt @@ -64,4 +64,8 @@ Number 1 is the preferred solution. //===---------------------------------------------------------------------===// +For dag combiner and instcombine: +Fold: "A / (B << N)" where B is a power of 2, to "A >> (N + log2(B))". +Fold: "A % (B << N)" where B is a power of 2, to "A & ((B << N) - 1)". +//===---------------------------------------------------------------------===// |
