Re: New backend

Hi!

On Wed, Dec 31, 2025 at 04:15:31PM +0100, BERTRAND Joël wrote:
> 	NOTICE_UPDATE_CC asks a lot of modifications in m6809.md (cc0 has to be
> replaced by REG:CC HARD_CC_REGNUM.

Yeah, CC0 has gone away.  And good riddance :-)  And yeah, using
something like you do is a good way to do things on most targets.

> 	Now build crashes with following error :
> 
> build/genconditions ../../gcc-15.2.0/gcc/common.md
> ../../gcc-15.2.0/gcc/config/m6809/m6809.md > tmp-condmd.cc
> /bin/bash ../../gcc-15.2.0/gcc/../move-if-change tmp-condmd.cc
> build/gencondmd.cc
> echo timestamp > s-conditions
> build/genpreds -c ../../gcc-15.2.0/gcc/common.md
> ../../gcc-15.2.0/gcc/config/m6809/m6809.md > tmp-constrs.h
> /bin/bash ../../gcc-15.2.0/gcc/../move-if-change tmp-constrs.h tm-constrs.h
> echo timestamp > s-constrs-h
> g++ -c   -g -O2     -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE
> -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall
> -Wno-error=narrowing -Wwrite-strings -Wcast-qual
> -Wmissing-format-attribute -Wconditionally-supported
> -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
> -Wno-overlength-strings  -DHAVE_CONFIG_H  -DGENERATOR_FILE -I. -Ibuild
> -I../../gcc-15.2.0/gcc -I../../gcc-15.2.0/gcc/build
> -I../../gcc-15.2.0/gcc/../include
> -I../../gcc-15.2.0/gcc/../libcpp/include  \
>         -o build/gencondmd.o build/gencondmd.cc
> ../../gcc-15.2.0/gcc/config/m6809/m6809.md:2350:22: error:
> ‘power_of_two_p’ was not declared in this scope
>  2350 |   "reload_completed && power_of_two_p (INTVAL (operands[1]) + 1)"
>       |                      ^~~~~~~~~~~~~~

You can use something like "exact_log2 (...) >= 0".

> ../../gcc-15.2.0/gcc/config/m6809/m6809.md:2350:22: error:
> ‘power_of_two_p’ was not declared in this scope
>  2350 |   "reload_completed && power_of_two_p (INTVAL (operands[1]) + 1)"
>       |                      ^~~~~~~~~~~~~~
> ../../gcc-15.2.0/gcc/config/m6809/m6809.md:1620:2: error:
> ‘far_functionp’ was not declared in this scope; did you mean
> ‘leaf_function_p’?
>  1620 |   "far_functionp (operands[0])"
>       |  ^~~~~~~~~~~~~
>       |  leaf_function_p
> ../../gcc-15.2.0/gcc/config/m6809/m6809.md:1620:2: error:
> ‘far_functionp’ was not declared in this scope; did you mean
> ‘leaf_function_p’?
>  1620 |   "far_functionp (operands[0])"
>       |  ^~~~~~~~~~~~~
>       |  leaf_function_p

No idea what these are about, that is something specific to your
backend?

> ../../gcc-15.2.0/gcc/config/m6809/m6809.md:2064:2: error:
> ‘m6809_match_peephole’ was not declared in this scope
>  2064 |   "m6809_match_peephole2 (PEEP_LSRB_ADCB, PEEP_END)"
>       |  ^~~~~~~~~~~~~~~~~~~~~
> ../../gcc-15.2.0/gcc/config/m6809/m6809.md:2064:2: error:
> ‘m6809_match_peephole’ was not declared in this scope
>  2064 |   "m6809_match_peephole2 (PEEP_LSRB_ADCB, PEEP_END)"
>       |  ^~~~~~~~~~~~~~~~~~~~~
> ../../gcc-15.2.0/gcc/config/m6809/m6809.md:2213:2: error:
> ‘m6809_match_peephole’ was not declared in this scope
>  2213 |   "m6809_match_peephole2 (PEEP_DEC_IMPLIES_CC, PEEP_END)"
>       |  ^~~~~~~~~~~~~~~~~~~~~
> ../../gcc-15.2.0/gcc/config/m6809/m6809.md:2213:2: error:
> ‘m6809_match_peephole’ was not declared in this scope
>  2213 |   "m6809_match_peephole2 (PEEP_DEC_IMPLIES_CC, PEEP_END)"
>       |  ^~~~~~~~~~~~~~~~~~~~~
> ../../gcc-15.2.0/gcc/config/m6809/m6809.md:2292:22: error:
> ‘m6809_match_peephole2’ was not declared in this scope
> 
> 	Of courses, these functions were defined in m6809.cc. I suppose I have
> forgotten something.

This stuff is not in the tarball you previously provided?


Segher