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extend.texi (Extended Asm): The '+' constraint does not require a register. 

* doc/extend.texi (Extended Asm): The '+' constraint does not
	require a register.

From-SVN: r192756
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Ian Lance Taylor 2012-10-24 04:45:55 +00:00 committed by Ian Lance Taylor
parent f6778644d5
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2 changed files with 6 additions and 4 deletions
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@ -1,3 +1,8 @@
2012-10-23 Ian Lance Taylor <iant@google.com>
* doc/extend.texi (Extended Asm): The '+' constraint does not
require a register.
2012-10-23 Jeff Law <law@redhat.com>
* tree-ssa-threadedge.c (thread_across_edge): Remove unused

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gcc/doc/extend.texi
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@ -5864,10 +5864,7 @@ The ordinary output operands must be write-only; GCC will assume that
the values in these operands before the instruction are dead and need
not be generated. Extended asm supports input-output or read-write
operands. Use the constraint character @samp{+} to indicate such an
operand and list it with the output operands. You should only use
read-write operands when the constraints for the operand (or the
operand in which only some of the bits are to be changed) allow a
register.
operand and list it with the output operands.
You may, as an alternative, logically split its function into two
separate operands, one input operand and one write-only output