[PATCH] D15568: [X86] Add signed aliases for popcnt intrinsics

[Kuperstein, Michael M via llvm-commits]

The exact same semantics as for positive, the sign bit counts:

https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=popcnt&expand=4047
vs.
https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=popcnt&expand=4045

(To be honest, I have no idea *why* these aliases exist.)

-----Original Message-----
From: llvm-commits [mailto:llvm-commits-bounces at lists.llvm.org] On Behalf Of Joerg Sonnenberger via llvm-commits
Sent: Wednesday, December 16, 2015 17:35
To: llvm-commits at lists.llvm.org
Subject: Re: [PATCH] D15568: [X86] Add signed aliases for popcnt intrinsics

On Wed, Dec 16, 2015 at 02:07:08PM +0000, Michael Kuperstein via llvm-commits wrote:
> The Intel manual documents both an unsigned form (_mm_popcnt_u32) and a signed form (_popcnt32) of the intrinsic.

What's the semantic for negative input?

Joerg
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