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| author | Richard Henderson <rth@gcc.gnu.org> | 1999-02-21 10:39:33 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 1999-02-21 10:39:33 -0800 |
| commit | 00bc45c1392b6925f8bfde8df8d7d38f827a320a (patch) | |
| tree | a5d5409fe8dbf60dd67476c51f7c00c766b4edbf /gcc | |
| parent | 7ee37ba40c711500d040d253a0cf49c635100d5a (diff) | |
| download | gcc-00bc45c1392b6925f8bfde8df8d7d38f827a320a.zip gcc-00bc45c1392b6925f8bfde8df8d7d38f827a320a.tar.gz gcc-00bc45c1392b6925f8bfde8df8d7d38f827a320a.tar.bz2 | |
Update attribute value documentation.
From-SVN: r25349
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/md.texi | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/gcc/md.texi b/gcc/md.texi index 6177ac2..890030d 100644 --- a/gcc/md.texi +++ b/gcc/md.texi @@ -3555,9 +3555,10 @@ The integer @var{i} specifies the value of a numeric attribute. @var{i} must be non-negative. The value of a numeric attribute can be specified either with a -@code{const_int} or as an integer represented as a string in -@code{const_string}, @code{eq_attr} (see below), and @code{set_attr} -(@pxref{Tagging Insns}) expressions. +@code{const_int}, or as an integer represented as a string in +@code{const_string}, @code{eq_attr} (see below), @code{attr}, +@code{symbol_ref}, simple arithmetic expressions, and @code{set_attr} +overrides on specific instructions (@pxref{Tagging Insns}). @cindex @code{const_string} and attributes @item (const_string @var{value}) @@ -3740,6 +3741,12 @@ The @code{very_unlikely} and @code{unlikely} flags are false if the @code{attr_flag} is only used during delay slot scheduling and has no meaning to other passes of the compiler. + +@findex attr +@item (attr @var{name}) +The value of another attribute is returned. This is most useful +for numeric attributes, as @code{eq_attr} and @code{attr_flag} +produce more efficient code for non-numeric attributes. @end table @node Tagging Insns |