The current definition of TARGET_PROMOTE_PROTOTYPES on the SPARC is:
static bool
sparc_promote_prototypes (const_tree fntype ATTRIBUTE_UNUSED)
{
return TARGET_ARCH32 ? true : false;
}
As Jorge pointed out, in 32-bit mode this generates extensions of the argument
registers in the callee that are redundant, at least according to the latest
version (3rd) of the psABI: it says that the argument registers are already
extended by the caller if there is a prototype. Therefore, Jorge suggests
that we return false in 32-bit mode too (this is PR target/46208).
Ironically enough, returning true in 32-bit mode is partly used to implement
the psABI; you cannot simply toggle the return value, further adjustments are
needed to compensate. But this should ultimately work, as in 64-bit mode.
Are there still any good reasons to keep the old setting at this point?
--
Eric Botcazou
