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Re: atomic ops for powerpc

>>>>> Geoffrey Keating writes:

Geoff> GNU as has supported lwsync since 2003, it's in 2.15 and 2.16.  I 
Geoff> presume AIX as has supported it for even longer than that since the 
Geoff> instruction originated at IBM.

	One could test at configure time if lwsync mnemonic is recognized
and emit a "sync" instruction if it is not.

Geoff> What do you suggest?  Again, we could use a .long, or I guess 'bne- 
Geoff> .-16', if that works everywhere.

	One could use "bne- $-16" and "bne- $+16", or explicitly generate
and emit labels, as is done by other patterns in rs6000.md.

Thanks, David
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