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| author | Chris Lattner <sabre@nondot.org> | 2006-09-15 20:31:36 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-09-15 20:31:36 +0000 |
| commit | c9dc375d3ee49dc5dfa2156cc8bc340e1449b26c (patch) | |
| tree | c08a76f5de50d5825455602948caf99d724e042a /llvm | |
| parent | 1bcb3d16cc428d4b79ad50ba32ffd7c14c63e52d (diff) | |
| download | bcm5719-llvm-c9dc375d3ee49dc5dfa2156cc8bc340e1449b26c.tar.gz bcm5719-llvm-c9dc375d3ee49dc5dfa2156cc8bc340e1449b26c.zip | |
add a nate note
llvm-svn: 30399
Diffstat (limited to 'llvm')
| -rw-r--r-- | llvm/lib/Target/README.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Target/README.txt b/llvm/lib/Target/README.txt index 86c231bf319..1f982b7f76a 100644 --- a/llvm/lib/Target/README.txt +++ b/llvm/lib/Target/README.txt @@ -240,4 +240,10 @@ _bar: addic r3,r3,-1 subfe r3,r3,r3 blr +//===---------------------------------------------------------------------===// + +Legalize should lower ctlz like this: + ctlz(x) = popcnt((x-1) & ~x) + +on targets that have popcnt but not ctlz. itanium, what else? |
