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| -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? |