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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: Wed, 19 May 2021 16:23:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D61577

--- Comment #216 from dave.anglin at bell dot net ---
On 2021-05-17 5:56 a.m., jvb at cyberscience dot com wrote:
> With the working as, I changed gcc to use brl instructions for calls, inc=
luding
> tail calls:
>
> --- gcc-11.1.0/gcc/config/ia64/ia64.md  2021-04-27 11:00:13.000000000 +01=
00
> +++ gcc-11.1.0-snake/gcc/config/ia64/ia64.md    2021-05-13 14:49:21.00000=
0000
> +0100
> @@ -4410,7 +4410,9 @@
>          (const_int 0))
>     (clobber (match_operand:DI 1 "register_operand" "=3Db,b"))]
>    ""
> -  "br.call%+.many %1 =3D %0"
> +  "@
> +   br.call%+.many %1 =3D %0
> +   brl.call%+.many %1 =3D %0"
>    [(set_attr "itanium_class" "br,scall")])
>
>  (define_insn "call_value_nogp"
> @@ -4419,14 +4421,18 @@
>               (const_int 0)))
>     (clobber (match_operand:DI 2 "register_operand" "=3Db,b"))]
>    ""
> -  "br.call%+.many %2 =3D %1"
> +  "@
> +   br.call%+.many %2 =3D %1
> +   brl.call%+.many %2 =3D %1"
>    [(set_attr "itanium_class" "br,scall")])
>
>  (define_insn "sibcall_nogp"
>    [(call (mem:DI (match_operand:DI 0 "call_operand" "?b,s"))
>          (const_int 0))]
>    ""
> -  "br%+.many %0"
> +  "@
> +   br%+.many %0
> +   brl%+.many %0"
>    [(set_attr "itanium_class" "br,scall")])
>
>  (define_insn "call_gp"
We only should use brl when TARGET_HPUX and ia64_tune =3D=3D PROCESSOR_ITAN=
IUM2.=C2=A0 I
wouldn't worry too much
about it being slightly less efficient.=C2=A0 You can use the pattern const=
raint to
implement this.=