loadgp in config/mips/mips.md

loadgp in config/mips/mips.md

[Jeffrey A Law]

------- Forwarded Message

From: Paul Henning <phenning@cs.uiowa.edu>
Message-Id: <199711092141.PAA18185@server.cs.uiowa.edu>
To: egcs@cygnus.com
CC: Chris.Yeoh@adelaide.maptek.com.au, wilson@cygnus.com
Subject: loadgp in config/mips/mips.md
Mime-Version: 1.0
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xxxsystem: egcs-971105 for mips-sgi-irix6.*

I was curious about the definition of the "loadgp" instruction in
xxxconfig/mips/mips.md:

- - ----
;; Instructions to load the global pointer register.
;; This is volatile to make sure that the scheduler won't move any symbol_ref
;; uses in front of it.  All symbol_refs implicitly use the gp reg.

(define_insn "loadgp"
  [(set (reg:DI 28)
	(unspec_volatile [(match_operand:DI 0 "address_operand" "")] 2))
   (clobber (reg:DI 1))]
  ""
  "%[lui\\t$1,%%hi(%%neg(%%gp_rel(%a0)))\\n\\taddiu\\t$1,$1,%%lo(%%neg(%%gp_rel
(%a0)))\\n\\tdaddu\\t$gp,$1,$25%]"
  [(set_attr "type"	"move")
   (set_attr "mode"	"DI")
   (set_attr "length"	"3")])
- - ----

The %gp_rel and %neg relocations this puts out work fine with SGI's as,
but really confuse gas-970915.  Is this definition broken for putting
out these symbols or is gas broken for not recognizing them?

Cheers,
Paul

- ------- End of Forwarded Message


------- End of Forwarded Message

Re: loadgp in config/mips/mips.md

[Ian Lance Taylor]

   From: Paul Henning <phenning@cs.uiowa.edu>

   The %gp_rel and %neg relocations this puts out work fine with SGI's as,
   but really confuse gas-970915.  Is this definition broken for putting
   out these symbols or is gas broken for not recognizing them?

It is gas that is broken.

gas does not support Irix 6.  You can force it to be configured for
Irix 6, but it only works in certain special cases.  I would, of
course, be happy to accept patches for this.

Ian

Re: loadgp in config/mips/mips.md

[Richard Henderson]

On Mon, Nov 10, 1997 at 10:09:50AM -0800, Jeffrey A Law wrote:
> The %gp_rel and %neg relocations this puts out work fine with SGI's as,
> but really confuse gas-970915.  Is this definition broken for putting
> out these symbols or is gas broken for not recognizing them?

I had patches for this once, but I lost them during some incautious
shuffling of directories.  It wouldn't be very hard to recreate though.


r~