------- Comment #1 from ebotcazou at gcc dot gnu dot org 2010-09-20 21:59
-------
> Even though the use of the "m" constraint will fix this testcase, "m" cannot
> be used in general, because it allows the operand to be offsetable.
Right.
> The casx instruction will not tolerate an offset. According to gcc info page,
> "V" should be just like "m", but not offsetable. Wonder why "V" does not work
> when "m" does in this case.
Because essentially all memory operands are offsettable on the SPARC. And the
operand required by 'casx', i.e [reg], is also offsettable.
The fix is to use 'casx [%0]' instead and adjust.
--
ebotcazou at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ebotcazou at gcc dot gnu dot
| |org
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36558
