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md.texi (movMM): Clarify semantics of storing into a non-paradoxical SUBREG.

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* doc/md.texi (movMM): Clarify semantics of storing into a
        non-paradoxical SUBREG.

From-SVN: r46494
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Jeffrey A Law 2001-10-25 18:25:08 +00:00 committed by Jeff Law
parent 37207ee73d
commit 8feb4e2800
2 changed files with 8 additions and 1 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
Thu Oct 25 12:21:58 2001 Jeffrey A Law (law@cygnus.com)
* doc/md.texi (movMM): Clarify semantics of storing into a
non-paradoxical SUBREG.
2001-10-25 Zack Weinberg <zack@codesourcery.com>
* langhooks.c (lang_hook_default_clear_binding_stack): New.

4
gcc/doc/md.texi
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@ -2024,7 +2024,9 @@ This instruction pattern moves data with that machine mode from operand
If operand 0 is a @code{subreg} with mode @var{m} of a register whose
own mode is wider than @var{m}, the effect of this instruction is
to store the specified value in the part of the register that corresponds
to mode @var{m}. The effect on the rest of the register is undefined.
to mode @var{m}. Bits outside of @var{m}, but which are within the
same target word as the @code{subreg} are undefined. Bits which are
outside the target word are left unchanged.
This class of patterns is special in several ways. First of all, each
of these names up to and including full word size @emph{must} be defined,