[llvm-dev] Most efficient way to check if a <n x i1> vector only contains 1s

[zhi chen via llvm-dev]

BTW, I also used bitcast to cast <nxi1> to i_n and then compare it with a
n-bit data with all 1s to check equivalence. But it seemed that it was
still slow.

Best,
Zhi

On Wed, Jan 20, 2016 at 5:18 PM, zhi chen <zchenhn at gmail.com> wrote:

> Hi all,
>
> What's is the most efficient way to check if a vectorType Value a <n x i1>
> only contains 1s in LLVM, where n is even? I tried to extract each element
> and then insert an ICmpInst with low efficiency because I didn't see a
> reduction operation. Is there any better way?
>
> Best,
> Zhi
>
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