| commit | 11faea381faa3e73d2532bde864df1936713be97 | [log] [tgz] |
|---|---|---|
| author | Sanjay Patel <spatel@rotateright.com> | Tue Jul 19 22:09:34 2016 +0000 |
| committer | Sanjay Patel <spatel@rotateright.com> | Tue Jul 19 22:09:34 2016 +0000 |
| tree | 393b24c3074929d1af6dfed15802c46ba7d9c7d5 | |
| parent | fed9fd5a7a75e3baa14b062d282a8d92f8ed053d [diff] |
[InstCombine] fold add(zext(xor X, C), C) --> sext X when C is INT_MIN in the source type
The pattern may look more obviously like a sext if written as:
define i32 @g(i16 %x) {
%zext = zext i16 %x to i32
%xor = xor i32 %zext, 32768
%add = add i32 %xor, -32768
ret i32 %add
}
We already have that fold in visitAdd().
Differential Revision: https://reviews.llvm.org/D22477
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276035 91177308-0d34-0410-b5e6-96231b3b80d8