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Improve movstrXX documentation.

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From-SVN: r17587
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Jeff Law 1998-02-01 17:17:02 -07:00
parent a703fb388b
commit 8c01d9b6f7
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gcc/md.texi
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@ -1956,6 +1956,12 @@ destination, in the form of a @code{const_int} rtx. Thus, if the
compiler knows that both source and destination are word-aligned,
it may provide the value 4 for this operand.
Descriptions of multiple @code{movstr@var{m}} patterns can only be
beneficial if the patterns for smaller modes have less restrictions
on their first, second and fourth operands. Note that the mode @var{m}
in @code{movstr@var{m}} does not impose any restriction on the mode of
individually moved data units in the block.
These patterns need not give special consideration to the possibility
that the source and destination strings might overlap.
@ -1970,6 +1976,8 @@ of a @code{const_int} rtx. Thus, if the compiler knows that the
destination is word-aligned, it may provide the value 4 for this
operand.
The use for multiple @code{clrstr@var{m}} is as for @code{movstr@var{m}}.
@cindex @code{cmpstr@var{m}} instruction pattern
@item @samp{cmpstr@var{m}}
Block compare instruction, with five operands. Operand 0 is the output;