llvm-project

Commit Graph

Author	SHA1	Message	Date
Eli Friedman	e6b4719244	[ARM] Add Thumb1 coverage for cmn testcases. There's a missed optimization for immediates: we can save two instructions by using adds instead of movs+mvns+cmp. llvm-svn: 335002	2018-06-19 00:09:44 +00:00
Roger Ferrer Ibanez	d41059a9f6	[ARM] Materialise some boolean values to avoid a branch This patch combines some cases of ARMISD::CMOV for integers that arise in comparisons of the form a != b ? x : 0 a == b ? 0 : x and that currently (e.g. in Thumb1) are emitted as branches. Differential Revision: https://reviews.llvm.org/D34515 llvm-svn: 325323	2018-02-16 09:23:59 +00:00
Bill Wendling	4b79647a6e	Re-enable the CMN instruction. We turned off the CMN instruction because it had semantics which we weren't getting correct. If we are comparing with an immediate, then it's okay to use the CMN instruction. <rdar://problem/7569620> llvm-svn: 158302	2012-06-11 08:07:26 +00:00

Author

SHA1

Message

Date

Eli Friedman

e6b4719244

[ARM] Add Thumb1 coverage for cmn testcases.

There's a missed optimization for immediates: we can save two
instructions by using adds instead of movs+mvns+cmp.

llvm-svn: 335002

2018-06-19 00:09:44 +00:00

Roger Ferrer Ibanez

d41059a9f6

[ARM] Materialise some boolean values to avoid a branch

This patch combines some cases of ARMISD::CMOV for integers that arise in comparisons of the form

  a != b ? x : 0
  a == b ? 0 : x

and that currently (e.g. in Thumb1) are emitted as branches.

Differential Revision: https://reviews.llvm.org/D34515

llvm-svn: 325323

2018-02-16 09:23:59 +00:00

Bill Wendling

4b79647a6e

Re-enable the CMN instruction.

We turned off the CMN instruction because it had semantics which we weren't
getting correct. If we are comparing with an immediate, then it's okay to use
the CMN instruction.
<rdar://problem/7569620>

llvm-svn: 158302

2012-06-11 08:07:26 +00:00

3 Commits