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From: "jvb at cyberscience dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/61577] [4.9.0 Regression] can't compile on hp-ux v3
 ia64
Date: Thu, 20 May 2021 09:19:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D61577

--- Comment #217 from John Buddery <jvb at cyberscience dot com> ---
Thanks very much for adding the binutils patch.

Sorry, I'm new to .md definitions, so I've probably got this wrong. Did you
mean something like:

(define_insn "call_nogp_longcall"
  [(call (mem:DI (match_operand:DI 0 "call_operand" "?b,s"))
         (const_int 0))
   (clobber (match_operand:DI 1 "register_operand" "=3Db,b"))]
  "TARGET_HPUX && ia64_tune =3D=3D PROCESSOR_ITANIUM2"
  "@
   br.call%+.many %1 =3D %0
   brl.call%+.many %1 =3D %0"
  [(set_attr "itanium_class" "br,scall")])

(define_insn "call_nogp"
  [(call (mem:DI (match_operand:DI 0 "call_operand" "?b,s"))
         (const_int 0))
   (clobber (match_operand:DI 1 "register_operand" "=3Db,b"))]
  ""
  "br.call%+.many %1 =3D %0"
  [(set_attr "itanium_class" "br,scall")])

I assume you need a second instruction to catch the case where the condition
doesn't match ?

Itanium 1 support seems to have been dropped at some point, so -mtune only
accepts options mapping to Itanium2. So, I couldn't test the br case on HP.=