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| author | Chris Lattner <sabre@nondot.org> | 2006-02-03 21:25:23 +0000 |
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| committer | Chris Lattner <sabre@nondot.org> | 2006-02-03 21:25:23 +0000 |
| commit | f92bafa2cad6c9c6bdc6fb6ec5fe2d20ca2c9e89 (patch) | |
| tree | 3ea95b304a32c367ee29f752c0d63740681cd3bf /lib/Target/README.txt | |
| parent | 7632e2beb4f0eacc49d580cbf23c89f24ad07ce9 (diff) | |
| download | external_llvm-f92bafa2cad6c9c6bdc6fb6ec5fe2d20ca2c9e89.zip external_llvm-f92bafa2cad6c9c6bdc6fb6ec5fe2d20ca2c9e89.tar.gz external_llvm-f92bafa2cad6c9c6bdc6fb6ec5fe2d20ca2c9e89.tar.bz2 | |
add a note
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25942 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/README.txt')
| -rw-r--r-- | lib/Target/README.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index 2a0d8e1..32a2e7c 100644 --- a/lib/Target/README.txt +++ b/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)". +//===---------------------------------------------------------------------===// |