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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 | cbce2f6c1b5b63b16b856f80e6fc026764b4eab4 (patch) | |
| tree | 5733ca45b81ed1d5b8642b6bb147b9dcf3f5ba47 | |
| parent | 42fe4957a9e862b92a7759a7a10c470ff9fe5bdb (diff) | |
add a nate note
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30399 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/README.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index 86c231bf31..1f982b7f76 100644 --- a/lib/Target/README.txt +++ b/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? |