TARGET_PROMOTE_PROTOTYPES on the SPARC

TARGET_PROMOTE_PROTOTYPES on the SPARC

[Eric Botcazou]

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