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Commit Graph

Author	SHA1	Message	Date
James Molloy	4d86bed0bb	[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. llvm-svn: 281040	2016-09-09 12:52:24 +00:00

Author

SHA1

Message

Date

James Molloy

4d86bed0bb

[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.

llvm-svn: 281040

2016-09-09 12:52:24 +00:00

1 Commits