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Re: [PATCH] Workaround for ffs() on LP64 targets

From: Sebastian Huber <sebastian dot huber at embedded-brains dot de>
To: Kito Cheng <kito dot cheng at gmail dot com>
Cc: newlib at sourceware dot org
Date: Thu, 27 Jul 2017 10:40:25 +0200
Subject: Re: [PATCH] Workaround for ffs() on LP64 targets
Authentication-results: sourceware.org; auth=none
References: <20170727080624.24818-1-sebastian.huber@embedded-brains.de> <CA+yXCZBKQQpJ+Gwo2odKC7GoBHUY_JiFarFuweNOQcHVMpB11w@mail.gmail.com>

On 27/07/17 10:29, Kito Cheng wrote:

it's will make aarch64 gen worse code (compare to __builtin_ffs
version) since aarch64 have clz, but I don't have better idea too...

Maybe we should add a defined(__riscv__). A count leading zerosinstruction is quite common.


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Sebastian Huber, embedded brains GmbH

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Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.

Follow-Ups:
- Re: [PATCH] Workaround for ffs() on LP64 targets
  - From: Kito Cheng

References:
- [PATCH] Workaround for ffs() on LP64 targets
  - From: Sebastian Huber
- Re: [PATCH] Workaround for ffs() on LP64 targets
  - From: Kito Cheng

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