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Re: Missing _BitScanReverse64()

From: Gisle Vanem
Subject: Re: Missing _BitScanReverse64()
Date: Mon, 05 Jan 2015 21:32:03 +0000
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:34.0) Gecko/20100101 Firefox/34.0 SeaMonkey/2.31

Pádraig Brady wrote:

Does the following address the issue for you?
It should drop back to the more generic slow path on 32 bit.

But I do have _BitReverse. That could be an intrinsic.

BTW do we have the same issue with __popcnt64 in count-one-bits.h?

Seems so:
  __MACHINEX64(unsigned __int64 __popcnt64(unsigned __int64))

X86 compilers only.


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