-@c Copyright 2001, 2002 Free Software Foundation, Inc.
+@c Copyright 2001, 2002, 2003, 2006, 2011 Free Software Foundation, Inc.
@c This is part of the GAS manual.
@c For copying conditions, see the file as.texinfo.
@c MMIX description by Hans-Peter Nilsson, hp@bitrange.com
The @code{mmixal} documentation (@pxref{mmixsite}) specifies that global
registers allocated with the @samp{GREG} directive (@pxref{MMIX-greg}) and
initialized to the same non-zero value, will refer to the same global
-register. This isn't strictly enforcable in @code{@value{AS}} since the
+register. This isn't strictly enforceable in @code{@value{AS}} since the
final addresses aren't known until link-time, but it will do an effort
unless the @samp{--no-merge-gregs} option is specified. (Register merging
isn't yet implemented in @code{@value{LD}}.)
implemented in @code{@value{LD}}.) The option @samp{-x} also imples
@samp{--linker-allocated-gregs}.
+@cindex @samp{--no-pushj-stubs} command line option, MMIX
+@cindex @samp{--no-stubs} command line option, MMIX
+If instruction expansion is enabled, @code{@value{AS}} can expand a
+@samp{PUSHJ} instruction into a series of instructions. The shortest
+expansion is to not expand it, but just mark the call as redirectable to a
+stub, which @code{@value{LD}} creates at link-time, but only if the
+original @samp{PUSHJ} instruction is found not to reach the target. The
+stub consists of the necessary instructions to form a jump to the target.
+This happens if @code{@value{AS}} can assert that the @samp{PUSHJ}
+instruction can reach such a stub. The option @samp{--no-pushj-stubs}
+disables this shorter expansion, and the longer series of instructions is
+then created at assembly-time. The option @samp{--no-stubs} is a synonym,
+intended for compatibility with future releases, where generation of stubs
+for other instructions may be implemented.
+
@cindex @samp{--linker-allocated-gregs} command line option, MMIX
Usually a two-operand-expression (@pxref{GREG-base}) without a matching
@samp{GREG} directive is treated as an error by @code{@value{AS}}. When
The characters @samp{*} and @samp{#} are line comment characters; each
start a comment at the beginning of a line, but only at the beginning of a
line. A @samp{#} prefixes a hexadecimal number if found elsewhere on a
-line.
+line. If a @samp{#} appears at the start of a line the whole line is
+treated as a comment, but the line can also act as a logical line
+number directive (@pxref{Comments}) or a preprocessor control command
+(@pxref{Preprocessing}).
Two other characters, @samp{%} and @samp{!}, each start a comment anywhere
on the line. Thus you can't use the @samp{modulus} and @samp{not}
The directives @samp{WYDE}, @samp{TETRA} and @samp{OCTA} emit constants of
two, four and eight bytes size respectively. Before anything else happens
for the directive, the current location is aligned to the respective
-constant-size bondary. If a label is defined at the beginning of the
+constant-size boundary. If a label is defined at the beginning of the
line, its value will be that after the alignment. A single operand can be
omitted, defaulting to a zero value emitted for the directive. Operands
can be expressed as strings (@pxref{Strings}), in which case each
must write @code{addu $1,$2,3}.
You can't LOC to a lower address than those already visited
-(i.e. ``backwards'').
+(i.e., ``backwards'').
A LOC directive must come before any emitted code.
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