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Fixes for the ARM-specific bswap_16, bswap_32, and bswap_64.

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1. Make the feature test work by excluding known-deficient processors, so
we don't have to maintain a complete list of all the processors that support
REV and REV16.

2. Don't abuse 'register' to get an effect similar to GCC's +l constraint,
but which was unnecessarily restrictive.

3. Fix __swap64md so _x isn't clobbered, breaking 64-bit swaps.

4. Make <byteswap.h> (which declars bswap_16 and friends) use <endian.h>
rather than <sys/endian.h>, so we get the machine-dependent implementations.

Change-Id: I6a38fad7a9fbe394aff141489617eb3883e1e944
This commit is contained in:
Elliott Hughes
2010-09-24 17:55:58 -07:00
parent 312be567a0
commit 3cf53d1a78
2 changed files with 27 additions and 30 deletions
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3
libc/include/byteswap.h
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@@ -28,7 +28,8 @@
#ifndef _BYTESWAP_H_
#define _BYTESWAP_H_
#include <sys/endian.h>
/* endian.h rather than sys/endian.h so we get the machine-specific file. */
#include <endian.h>
#define bswap_16(x) swap16(x)
#define bswap_32(x) swap32(x)