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* [Bug target/55302] New: [SH] Add support for logical ops with GBR mems
@ 2012-11-13  0:18 olegendo at gcc dot gnu.org
  2015-02-08 11:44 ` [Bug target/55302] " olegendo at gcc dot gnu.org
  0 siblings, 1 reply; 2+ messages in thread
From: olegendo at gcc dot gnu.org @ 2012-11-13  0:18 UTC (permalink / raw)
  To: gcc-bugs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55302

             Bug #: 55302
           Summary: [SH] Add support for logical ops with GBR mems
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: olegendo@gcc.gnu.org
            Target: sh*-*-*


Since now GCC supports GBR based mem refs through the __builtin_thread_pointer
function (PR 54760), support for logical operations on QImode GBR mem refs
could be added.  The insns in question are:

and.b  #imm,@(r0,gbr)
or.b   #imm,@(r0,gbr)
tst.b  #imm,@(r0,gbr)
xor.b  #imm,@(r0,gbr)

Although the insns are slower than using separate loads/stores and operation
insn sequences, the resulting code can be potentially more compact.  It might
be beneficial to enable these insns when optimizing for size.


^ permalink raw reply	[flat|nested] 2+ messages in thread
* [Bug target/55302] [SH] Add support for logical ops with GBR mems
  2012-11-13  0:18 [Bug target/55302] New: [SH] Add support for logical ops with GBR mems olegendo at gcc dot gnu.org
@ 2015-02-08 11:44 ` olegendo at gcc dot gnu.org
  0 siblings, 0 replies; 2+ messages in thread
From: olegendo at gcc dot gnu.org @ 2015-02-08 11:44 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55302

--- Comment #1 from Oleg Endo <olegendo at gcc dot gnu.org> ---
If the atomic model allows it, the GBR logical ops can also be to implement
atomic operations on GBR relative memory.


^ permalink raw reply	[flat|nested] 2+ messages in thread
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2012-11-13  0:18 [Bug target/55302] New: [SH] Add support for logical ops with GBR mems olegendo at gcc dot gnu.org
2015-02-08 11:44 ` [Bug target/55302] " olegendo at gcc dot gnu.org

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