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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/97653] [11 Regression] Incorrect long double calculation
 with -mabi=ibmlongdouble
Date: Wed, 31 Mar 2021 11:59:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97653

--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So, just completely untested possibility:
--- libgcc/config/rs6000/t-float128.jj  2021-03-30 18:11:52.572091848 +0200
+++ libgcc/config/rs6000/t-float128     2021-03-31 13:55:47.199756547 +0200
@@ -90,8 +90,16 @@ ibm128_dec_objs              =3D $(addsuffix $(objext)
 FP128_CFLAGS_DECIMAL   =3D -mno-gnu-attribute -Wno-psabi -mabi=3Dieeelongd=
ouble
 IBM128_CFLAGS_DECIMAL  =3D -mno-gnu-attribute -Wno-psabi -mabi=3Dibmlongdo=
uble

+ibm128_siditi_tf_funcs =3D \
+  $(foreach f,$(sifuncs) $(difuncs) $(tifuncs),$(if $(findstring tf,$f),$f=
))
+ibm128_siditi_tf_objs =3D $(patsubst %,%$(objext),$(ibm128_siditi_tf_funcs=
))
+ifeq ($(enable_shared),yes)
+ibm128_siditi_tf_objs +=3D $(patsubst %,%_s$(objext),$(ibm128_siditi_tf_fu=
ncs))
+endif
+
 $(fp128_dec_objs)      : INTERNAL_CFLAGS +=3D $(FP128_CFLAGS_DECIMAL)
 $(ibm128_dec_objs)     : INTERNAL_CFLAGS +=3D $(IBM128_CFLAGS_DECIMAL)
+$(ibm128_siditi_tf_objs) : INTERNAL_CFLAGS +=3D $(IBM128_CFLAGS_DECIMAL)

 $(fp128_softfp_src) : $(srcdir)/soft-fp/$(subst -sw,,$(subst kf,tf,$@))
$(fp128_dep)
        @src=3D"$(srcdir)/soft-fp/$(subst -sw,,$(subst kf,tf,$@))"; \


(though IBM128_CFLAGS_DECIMAL is misnamed for those because it has nothing =
to
do with decimal).=