| commit | 9d97dd42c1db24db46a879e5f3da3eff834f481e | [log] [tgz] |
|---|---|---|
| author | Craig Topper <craig.topper@intel.com> | Wed Dec 20 19:25:33 2017 +0000 |
| committer | Craig Topper <craig.topper@intel.com> | Wed Dec 20 19:25:33 2017 +0000 |
| tree | 86fa5addcac800b8b83c8fef9a960fa1f5ac7dab | |
| parent | 37489f4c210390094f694e90bff314747700526a [diff] |
[X86] Remove zext from vXi32 to vXi64 on indices of gather/scatter instructions if we can prove the pre-extended value is positive. Gather/scatter can implicitly sign extend from i32->i64 on indices. So if we know the sign bit of the input to a zext is 0 we can use the implicit extension. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321209 91177308-0d34-0410-b5e6-96231b3b80d8