[Bug target/41246] should "sorry" when regparm=3 and nested functions are encountered

[rth at gcc dot gnu dot org]

------- Comment #15 from rth at gcc dot gnu dot org  2009-09-09 21:28 -------
(In reply to comment #13)
> Could this chain perhaps be moved to %edx?

No, regparm(3) uses all of %eax, %edx, %ecx.  There are no other
available call-clobbered registers.

Incidentally, fastcall functions are currently broken as well,
though for them %eax is available as a scratch.

> Could trampoline just push %ecx as its first operation? this way
> trampoline would "convert" regparm(2) to regparm(3) function

No.  Any change that affects the stack cannot be done in the 
trampoline only, as the stack change needs to be undone in 
the nested function itself.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41246