[Bug target/34526] no-altivec ABI should be fixed or no longer be the default

[janis at gcc dot gnu dot org]

------- Comment #6 from janis at gcc dot gnu dot org  2008-02-05 02:23 -------
There's another mess hiding under the ABI change, which is that synthetic
vectors of the same size as AltiVec vectors are passed differently for
-mabi=altivec than for -mabi=no-altivec.  There are warnings for synthetic
vectors passed by reference with "-mno-altivec -mabi=no-altivec" (currently the
-m32 default) but no warning for "-mno-altivec -mabi=altivec" (the planned -m32
default).  Varargs are apparently broken for "-mno-altivec -mabi=altivec", or
at least test gcc.c-torture/execute/va-arg-25.c fails with those options as the
default.

I wonder if anything actually uses synthetic vectors and if so, whether they
are ever passed as arguments or return values.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34526