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How to define PSImode for a target?
- From: Lev Yudalevich <lyudalev at gmail dot com>
- To: gcc at gcc dot gnu dot org
- Date: Sun, 22 Nov 2009 20:08:58 +0200
- Subject: How to define PSImode for a target?
Hi,
While working on a port for my custom target I'm looking for some
advice on how to define a smaller-than-integer scalar mode.
I'd like to use it together with
__attribute__((__libgcc_cmp_return__)) mode attribute.
In my target xx-modes.def file I have PARTIAL_MODE_INT(SI) defined.
And my TARGET_LIBGCC_CMP_RETURN_MODE hook is set to a function
returning PSImode.
However, compilation of the libgcc fails in libgcc2.h at line 172 with
an error message: no data type for mode libgcc_cmp_return (the gcc
version I'm working on is 4.4.1).
PARTIAL_MODE_INT seems to be kind of undocumented feature. Can anybody
suggest the steps required to use it properly?
Sincerely,
-- Lev.