ptx preliminary rtl patches [3/4]

Steven Bosscher
Thu Sep 11 16:16:00 GMT 2014

On Thu, Sep 11, 2014 at 6:06 PM, Bernd Schmidt wrote:
> On 09/11/2014 05:55 PM, Steven Bosscher wrote:
>> On Thu, Sep 11, 2014 at 3:26 PM, Bernd Schmidt wrote:
>>> nvptx will be the first port to use BImode and have STORE_FLAG_VALUE==-1.
>>> That has exposed a bug in combine where we can end up calling
>>> num_sign_bit_copies for a BImode value. However, the return value is
>>> always
>>> 1 in that case, so it doesn't tell us anything and is going to be
>>> misinterpreted by the caller.
>>> Bootstrapped and tested on x86_64-linux, together with the other patches.
>>> Ok?
>> This should be handled in num_sign_bit_copies itself, i.e. handle BImode
>> there.
> What do you expect that function to do different? It returns the correct
> value.

No different. Just that if you want to check whether DECL is a global
variable then we have a predicate for it. So why use TREE_STATIC

In other words: Just trying to make/keep certain checks consistent. (A
hopeless cause, but a noble one... ;-)


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