[Bug target/60431] [PATCH] [TIC6X] target description missing abssi2 insn

["joseph at codesourcery dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60431

--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
The semantics of the abssi2 insn pattern on the most negative integer are 
that it returns the argument unchanged (RTL operations are generally 
modulo; the semantics don't depend on whether -fwrapv is used).  Thus, a 
saturating abs instruction is unsuitable for implementing that pattern; 
you need to make the machine-independent compiler able to use ssabssi2 to 
expand ABS_EXPR-with-undefined-overflow (i.e. ABS_EXPR without flag_wrapv 
or flag_trapv), when the saturating pattern is present but not the 
non-saturating pattern.