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* [Bug target/64792] New: [5 Regression][SH] movu.b movu.w not working
@ 2015-01-25 22:57 olegendo at gcc dot gnu.org
  2015-01-26 11:27 ` [Bug target/64792] " rguenth at gcc dot gnu.org
                   ` (7 more replies)
  0 siblings, 8 replies; 9+ messages in thread
From: olegendo at gcc dot gnu.org @ 2015-01-25 22:57 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64792

            Bug ID: 64792
           Summary: [5 Regression][SH] movu.b movu.w not working
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: olegendo at gcc dot gnu.org
            Target: sh*-*-*

The treg_set_expr patch from r220081 disabled early matching of the SH2A movu.b
and movu.w patterns during RTL expansion and combine.  This was done because
it's otherwise difficult to convert zero-extending loads back to sign-extending
loads in cases where using sign-extended values is fine.  Sign-extending loads
are shorter (2 bytes vs. 4 bytes insns) and the zero-extending loads should be
formed as a last resort option, after combine and split1, but before RA.  The
idea is to do that in a simple peephole-like RTL pass.


^ permalink raw reply	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2023-07-07 10:30 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-01-25 22:57 [Bug target/64792] New: [5 Regression][SH] movu.b movu.w not working olegendo at gcc dot gnu.org
2015-01-26 11:27 ` [Bug target/64792] " rguenth at gcc dot gnu.org
2015-04-22 11:59 ` [Bug target/64792] [5/6 " jakub at gcc dot gnu.org
2015-07-16  9:12 ` rguenth at gcc dot gnu.org
2021-05-14  9:47 ` [Bug target/64792] [9/10/11/12 " jakub at gcc dot gnu.org
2021-06-01  8:06 ` rguenth at gcc dot gnu.org
2022-05-27  9:35 ` [Bug target/64792] [10/11/12/13 " rguenth at gcc dot gnu.org
2022-06-28 10:31 ` jakub at gcc dot gnu.org
2023-07-07 10:30 ` [Bug target/64792] [11/12/13/14 " rguenth at gcc dot gnu.org

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