[Bug target/85216] Performance issue with PHP on ppc64 systems

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85216

David Edelsohn <dje at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2018-04-05
     Ever confirmed|0                           |1

--- Comment #1 from David Edelsohn <dje at gcc dot gnu.org> ---
What two additional instructions?  x86 is a CISC architecture and Power is a
RISC architecture.  x86 has an instruction that directly performs an indirect
call through a pointer. Power must explicitly load the pointer and move it to
the appropriate register to perform an indirect branch.

One can comment / questions that the *SEQUENCE* appears to require more time on
Power than the equivalent sequence on x86. But directly comparing instructions
and counting instructions in two different ISAs without context is not
meaningful.