https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61577
--- 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, > including > tail calls: > > --- gcc-11.1.0/gcc/config/ia64/ia64.md 2021-04-27 11:00:13.000000000 +0100 > +++ gcc-11.1.0-snake/gcc/config/ia64/ia64.md 2021-05-13 14:49:21.000000000 > +0100 > @@ -4410,7 +4410,9 @@ > (const_int 0)) > (clobber (match_operand:DI 1 "register_operand" "=b,b"))] > "" > - "br.call%+.many %1 = %0" > + "@ > + br.call%+.many %1 = %0 > + brl.call%+.many %1 = %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" "=b,b"))] > "" > - "br.call%+.many %2 = %1" > + "@ > + br.call%+.many %2 = %1 > + brl.call%+.many %2 = %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 == PROCESSOR_ITANIUM2. I wouldn't worry too much about it being slightly less efficient. You can use the pattern constraint to implement this.
