[llvm-commits] CVS: llvm/lib/Target/README.txt

[Chris Lattner]

Changes in directory llvm/lib/Target:

README.txt updated: 1.36 -> 1.37
---
Log message:

add a nate note


---
Diffs of the changes:  (+6 -0)

 README.txt |    6 ++++++
 1 files changed, 6 insertions(+)


Index: llvm/lib/Target/README.txt
diff -u llvm/lib/Target/README.txt:1.36 llvm/lib/Target/README.txt:1.37
--- llvm/lib/Target/README.txt:1.36	Thu Aug 24 18:06:02 2006
+++ llvm/lib/Target/README.txt	Fri Sep 15 15:31:36 2006
@@ -240,4 +240,10 @@
         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?