2008-05-08 David Daney <ddaney@avtrex.com>

2008-05-08  David Daney  <ddaney@avtrex.com>

	* lib/target-supports.exp (check_effective_target_sync_int_long): Add
	mips*-*-*.
	(check_effective_target_sync_char_short): Same.

2008-05-08  David Daney  <ddaney@avtrex.com>
	    Richard Sandiford  <rsandifo@nildram.co.uk>

	* config/mips/mips.md (mips_expand_compare_and_swap_12): Handle
	special case of constant zero operands.
	* config/mips/mips.c (mips_expand_compare_and_swap_12): Zero extend
	old and	new values.  Special case constant zero values.
	* config/mips/mips.h (MIPS_COMPARE_AND_SWAP): Skip 'sync' if compare
	fails.
	(MIPS_COMPARE_AND_SWAP_12): Handle constant zero operands.
	(MIPS_COMPARE_AND_SWAP_12_0): New macro.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@135088 138bc75d-0d04-0410-961f-82ee72b054a4