On Tue, Dec 10, 2013 at 9:04 AM, Kirill Yukhin <kirill.yuk...@gmail.com> wrote: > On 10 Dec 08:23, H.J. Lu wrote: >> What is wrong to pass the correct offset to >> CANNOT_CHANGE_MODE_CLASS? Backends are free to >> ignore it. > > Yes, but as fas as understand this hook as a predicate > saying if it not-safe to change mode1 to mode2 for given
In many places, the macro is used with the known offset. I have a follow up patch which improves x86 code generation, in cases like: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45198 > register class. I don't think that offsets should be > involved here. IMHO it is safe to change V4SF->SF > for SSE/AVX register... -- H.J.
