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2 Commits

Author SHA1 Message Date
Artyom Skrobov
b44e58377d In Thumb1 mode, the custom lowering for ARMISD::CMPZ could never emit tADDi3 
Reviewers: jmolloy, t.p.northover

Reviewed By: t.p.northover

Subscribers: t.p.northover, aemerson, rengolin, llvm-commits

Differential Revision: https://reviews.llvm.org/D30097

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295478 91177308-0d34-0410-b5e6-96231b3b80d8
 2017-02-17 18:59:16 +00:00
James Molloy
5349cafffb [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
 2016-09-09 12:52:24 +00:00