[PATCH] Fix COMPONENT_REF expansion (PR rtl-optimization/77919)

Jakub Jelinek jakub@redhat.com
Sat Oct 29 16:12:00 GMT 2016

On Fri, Oct 28, 2016 at 10:59:35AM +0200, Jakub Jelinek wrote:
> On Fri, Oct 28, 2016 at 10:52:34AM +0200, Richard Biener wrote:
> > > I've already committed the original patch based on Eric's review, but
> > > managed to come up with another testcase that still ICEs (one with two
> > > different complex modes).  Is the following ok for trunk if it passes
> > > bootstrap/regtest?
> > 
> > As we're dealing with memory isn't GET_MODE_SIZE the correct thing to
> > use?
> GET_MODE_PRECISION is what the case VIEW_CONVERT_EXPR case tests:

BTW, testing GET_MODE_SIZE or GET_MODE_BITSIZE doesn't make sense there,
            if (bitpos == 0
                && bitsize == GET_MODE_BITSIZE (GET_MODE (op0))
should already ensure that.  The GET_MODE_PRECISION check will force into
memory say x86 XCmode to {TC,CTI}mode or vice versa conversions, which are
better done through memory anyway.  If it isn't needed, then the question
is why VCE uses it.

Anyway, I've successfully bootstrapped/regtested the patch as is on
x86_64-linux and i686-linux.


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