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From: "dave.anglin at bell dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/61577] [4.9.0 Regression] can't compile on hp-ux v3
 ia64
Date: Thu, 20 May 2021 13:25:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D61577

--- Comment #218 from dave.anglin at bell dot net ---
On 2021-05-20 5:19 a.m., jvb at cyberscience dot com wrote:
> 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 y=
ou
> 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 condit=
ion
> doesn't match ?
Yes.=C2=A0 Note that the call_nogp pattern is output directly in a couple o=
f places
in ia64.c.=C2=A0 These
will need adjustment for hpux.

I'm not a ia64 maintainer.=C2=A0 I can only apply changes specific to hpux.

I have limited knowledge of the ia64 instruction set.=C2=A0 In the above, t=
he
"brl.call" alternative
apples to the "s" constraint for operand 0.=C2=A0 Is that what you want?=C2=
=A0 The
"br.call" form is used
for the disparaged "b" constraint for operand 0.

I'm not sure that the scall call attribute is correct for brl.
>
> 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 H=
P.
Then, we don't need to check the ia64_tune in the above.=