[Bug target/38599] New: There should be a Pmode == DImode version of the MIPS lwxs pattern

[rsandifo at gcc dot gnu dot org]

mipsisa64-elf-gcc -S -O2 -msmartmips gcc.target/mips/smartmips-lwxs.c
-DNOMIPS16=

does not produce an LWXS instruction.  This doesn't really matter much, since
SmartMIPS is only for 32-bit processors, but:

  (a) it works for 64-bit ILP32 ABIs like n32 and o64.
  (b) within gcc, there is an abstraction layer between "Do we have SmartMIPS?"
and "Can we use LWXS?".

So I think it's worth having a Pmode==DImode version anyway.

I'm filing this for 4.5 or later; it isn't something we'd fix in 4,4 or
earlier.


-- 
           Summary: There should be a Pmode == DImode version of the MIPS
                    lwxs pattern
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rsandifo at gcc dot gnu dot org
GCC target triplet: mipsisa64-elf


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38599