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From: Peter Wemm <peter@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
Subject: PERFORCE change 28415 for review
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http://perforce.freebsd.org/chv.cgi?CH=28415

Change 28415 by peter@peter_overcee on 2003/04/07 00:58:17

	Constrain registers for xchgb that have byte halves.
	eg: %bh, %bl.  The upper %rXX do not have an upper byte half.

Affected files ...

.. //depot/projects/hammer/sys/x86_64/include/endian.h#6 edit

Differences ...

==== //depot/projects/hammer/sys/x86_64/include/endian.h#6 (text+ko) ====

@@ -86,7 +86,7 @@
 
 #define __byte_swap_word(x) \
 __extension__ ({ register __uint16_t __X = (x); \
-   __asm ("xchgb %h0, %b0" : "+q" (__X)); \
+   __asm ("xchgb %h0, %b0" : "+Q" (__X)); \
    __X; })
 
 static __inline __uint64_t