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2017 Mar 29
2
sdiv in array subscript
Hi Eli,
Thanks. Do you mean ideally we should extend SimplifyIndVar to do the
sdiv->udiv replacement?
Thanks
Hongbin
On Wed, Mar 29, 2017 at 10:59 AM, Friedman, Eli <efriedma at codeaurora.org>
wrote:
> On 3/29/2017 10:35 AM, Hongbin Zheng via llvm-dev wrote:
>
>> Hi llvm-dev,
>>
>> Looks like currently ScalarEvolution will...
2017 Mar 29
2
sdiv in array subscript
Hi llvm-dev,
Looks like currently ScalarEvolution will give up if there is a sdiv in
array subscript, e.g.
int i;
A[i * 64 / 2]
in this case ScalarEvolution will just return an unknown for (i * 64 / 2).
For this case, InstCombine will do the jobs, but in general, is there a
pass to deal with the sdiv here? like replace sdiv by udiv based on the
range of "i"?
Thanks
Hongbin