Hi!
__floatunditf and __fixtfdi and a couple of other libgcc{.a,_s.so}
entrypoints for backwards compatibility should mean IBM double double
handling (i.e. IFmode), gcc emits such calls for that format and
form IEEE long double emits *kf* instead.
When gcc is configured without --with-long-double-format=ieee ,
everything is fine, but when it is not, we need to compile those
libgcc sources with -mno-gnu-attribute -mabi=ibmlongdouble.
The following snippet in libgcc/config/rs6000/t-linux was attempting
to ensure that, and for some routines it works fine (e.g. for _powitf2).
But, due to 4 different types of bugs it doesn't work for most of those
functions, which means that in --with-long-double-format=ieee
configured gcc those *tf* entrypoints instead handle the long double
arguments as if they were KFmode.
The bugs are:
1) the first few objs properly use $(objext) as suffix, but
several other contain a typo and use $(object) instead,
which is a variable that isn't set to anything, so we don't
add .o etc. extensions
2) while unsigned fix are properly called _fixuns*, unsigned float
are called _floatun* (without s), but the var was using there
the extra s and so didn't match
3) the variable didn't cover any of the TF <-> TI conversions,
only TF <-> DI conversions
4) nothing in libgcc_s.so was handled, as those object files are
called *_s.o rather than *.o and IBM128_SHARED_OBJS used wrong
syntax of the GNU make substitution reference, which should be
$(var:a=b) standing for $(patsubst a,b,$(var)) but it used
$(var:a:b) instead
Bootstrapped/regtested on powerpc64le-linux --with-long-double-format=ieee,
ok for trunk?
2021-03-31 Jakub Jelinek <ja...@redhat.com>
PR target/97653
* config/rs6000/t-linux (IBM128_STATIC_OBJS): Fix spelling, use
$(objext) instead of $(object). Use _floatunditf instead of
_floatunsditf. Add tf <-> ti conversion objects.
(IBM128_SHARED_OBJS): Use proper substitution reference syntax.
--- libgcc/config/rs6000/t-linux.jj 2020-12-04 08:08:06.556434569 +0100
+++ libgcc/config/rs6000/t-linux 2021-03-31 14:20:50.953852864 +0200
@@ -11,10 +11,12 @@ HOST_LIBGCC2_CFLAGS += -mno-minimal-toc
# the IBM extended double format. Also turn off gnu attributes on the static
# modules.
IBM128_STATIC_OBJS = ibm-ldouble$(objext) _powitf2$(objext) \
- ppc64-fp$(objext) _divtc3$(object) _multc3$(object) \
- _fixtfdi$(object) _fixunstfdi$(object) \
- _floatditf$(objext) _floatunsditf$(objext)
-IBM128_SHARED_OBJS = $(IBM128_STATIC_OBJS:$(objext):_s$(objext))
+ ppc64-fp$(objext) _divtc3$(objext) _multc3$(objext) \
+ _fixtfdi$(objext) _fixunstfdi$(objext) \
+ _floatditf$(objext) _floatunditf$(objext) \
+ _fixtfti$(objext) _fixunstfti$(objext) \
+ _floattitf$(objext) _floatuntitf$(objext)
+IBM128_SHARED_OBJS = $(IBM128_STATIC_OBJS:$(objext)=_s$(objext))
IBM128_OBJS = $(IBM128_STATIC_OBJS) $(IBM128_SHARED_OBJS)
IBM128_CFLAGS = -Wno-psabi -mabi=ibmlongdouble -mno-gnu-attribute
Jakub
