diff options
| author | Sanjay Patel <spatel@rotateright.com> | 2019-10-25 13:34:40 -0400 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2019-10-25 14:10:51 -0400 |
| commit | e6c145e0548e3b3de6eab27e44e1504387cf6b53 (patch) | |
| tree | 8ff26c2cb1af6be97bceb07b4bc7c4c169fa87d3 /lldb/scripts/Python | |
| parent | c35b358b741b942aa89acb1fe0d22d4126287493 (diff) | |
| download | llvm-e6c145e0548e3b3de6eab27e44e1504387cf6b53.zip llvm-e6c145e0548e3b3de6eab27e44e1504387cf6b53.tar.gz llvm-e6c145e0548e3b3de6eab27e44e1504387cf6b53.tar.bz2 | |
[DAGCombiner] widen zext of popcount based on target support
zext (ctpop X) --> ctpop (zext X)
This is a prerequisite step for canonicalizing in the other direction (narrow the popcount) in IR - PR43688:
https://bugs.llvm.org/show_bug.cgi?id=43688
I'm not sure if any other targets are affected, but I found a missing fold for PPC, so added tests based on that.
The reason we widen all the way to 64-bit in these tests is because the initial DAG looks something like this:
t5: i8 = ctpop t4
t6: i32 = zero_extend t5 <-- created based on IR, but unused node?
t7: i64 = zero_extend t5
Differential Revision: https://reviews.llvm.org/D69127
Diffstat (limited to 'lldb/scripts/Python')
0 files changed, 0 insertions, 0 deletions