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md.texi (reload_in/out): Document restrictions in predicates and constraints for these patterns.

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* doc/md.texi (reload_in/out): Document restrictions in predicates
        and constraints for these patterns.  Document empty string matching
        ALL_REGS.

From-SVN: r44134
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Richard Henderson 2001-07-18 14:34:15 -07:00 • committed by Richard Henderson
parent 31831acf29
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gcc/ChangeLog
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@ -1,3 +1,9 @@
2001-07-18 Richard Henderson <rth@redhat.com>
* doc/md.texi (reload_in/out): Document restrictions in predicates
and constraints for these patterns. Document empty string matching
ALL_REGS.
2001-07-18 Rainer Orth <ro@TechFak.Uni-Bielefeld.DE>
* defaults.h (ASM_OUTPUT_WEAK_ALIAS): Check for ASM_WEAKEN_LABEL.

11
gcc/doc/md.texi
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@ -2076,6 +2076,17 @@ move between operand 0 and operand 1. Operand 2 describes the scratch
register. See the discussion of the @code{SECONDARY_RELOAD_CLASS}
macro in @pxref{Register Classes}.
There are special restrictions on the form of the @code{match_operand}s
used in these patterns. First, only the predicate for the reload
operand is examined, i.e. @code{reload_in} examines operand 1, but not
the predicates for operand 0 or 2. Second, there may only be one
alternative in the constraints. Third, only a single register class
letter may be used for the constraint; subsequent constraint letters
are ignored. As a special exception, an empty constraint string
matches the @code{ALL_REGS} register class. This may relieve ports
of the burden of defining an @code{ALL_REGS} constraint letter just
for these patterns.
@cindex @code{movstrict@var{m}} instruction pattern
@item @samp{movstrict@var{m}}
Like @samp{mov@var{m}} except that if operand 0 is a @code{subreg}