| commit | 5349cafffb46c7a71fa6c695cc8aab32e048b555 | |
| author | James Molloy <james.molloy@arm.com> | |
| Fri, 9 Sep 2016 12:52:24 +0000 (9 12:52 +0000) | ||
| committer | James Molloy <james.molloy@arm.com> | |
| Fri, 9 Sep 2016 12:52:24 +0000 (9 12:52 +0000) | ||
| tree | fce4cb60e4d380c3df949ca48fb7da57b09955f1 | treesnapshot (tar.gz zip) |
| parent | 3c6f3f0961d2722354ac4b3da3f00d14cf6aa92c | commitdiff |
[Thumb] Select (CMPZ X, -C) -> (CMPZ (ADDS X, C), 0)
The CMPZ #0 disappears during peepholing, leaving just a tADDi3, tADDi8 or t2ADDri. This avoids having to materialize the expensive negative constant in Thumb-1, and allows a shrinking from a 32-bit CMN to a 16-bit ADDS in Thumb-2.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281040 91177308-0d34-0410-b5e6-96231b3b80d8
The CMPZ #0 disappears during peepholing, leaving just a tADDi3, tADDi8 or t2ADDri. This avoids having to materialize the expensive negative constant in Thumb-1, and allows a shrinking from a 32-bit CMN to a 16-bit ADDS in Thumb-2.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281040 91177308-0d34-0410-b5e6-96231b3b80d8