https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91255
Bug ID: 91255
Summary: Can't use define_subst in target that uses
set_attr_alternative
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: internal-improvement
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: ktkachov at gcc dot gnu.org
CC: rsandifo at gcc dot gnu.org
Target Milestone: ---
I'm trying to add a define_subst use in the arm backend but am getting many
build errors complaining about:
`set_attr_alternative' is unsupported by `define_subst'
Looking at the gensupport.c code it iterates over all define_insns and errors
if any of them have set_attr_alternative.
The usecase I'm targetting doesn't involve patterns with set_attr_alternative,
so could we make the define_subst handling more robust to only error out if the
define_subst is actually attempted on a set_attr_alternative?
grepping around the sources it looks like the only ports that make use of
define_subst don't have any set_attr_alternative occurrences
