* doc/md.texi: Update documentation of MIPS constraints.

[pf3gnuchains/gcc-fork.git] / gcc / doc / md.texi

diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index 6a3300b..0fc2265 100644 (file)
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -2368,68 +2368,65 @@ Memory addressed using the small base register ($sb).
 $r1h
 @end table
 
-@item MIPS---@file{config/mips/mips.h}
+@item MIPS---@file{config/mips/constraints.md}
 @table @code
 @item d
-General-purpose integer register
+An address register.  This is equivalent to @code{r} unless
+generating MIPS16 code.
 
 @item f
-Floating-point register (if available)
+A floating-point register (if available).
 
 @item h
-@samp{Hi} register
+The @code{hi} register.
 
 @item l
-@samp{Lo} register
+The @code{lo} register.
 
 @item x
-@samp{Hi} or @samp{Lo} register
+The @code{hi} and @code{lo} registers.
+
+@item c
+A register suitable for use in an indirect jump.  This will always be
+@code{$25} for @option{-mabicalls}.
 
 @item y
-General-purpose integer register
+Equivalent to @code{r}; retained for backwards compatibility.
 
 @item z
-Floating-point status register
+A floating-point condition code register.
 
 @item I
-Signed 16-bit constant (for arithmetic instructions)
+A signed 16-bit constant (for arithmetic instructions).
 
 @item J
-Zero
+Integer zero.
 
 @item K
-Zero-extended 16-bit constant (for logic instructions)
+An unsigned 16-bit constant (for logic instructions).
 
 @item L
-Constant with low 16 bits zero (can be loaded with @code{lui})
+A signed 32-bit constant in which the lower 16 bits are zero.
+Such constants can be loaded using @code{lui}.
 
 @item M
-32-bit constant which requires two instructions to load (a constant
-which is not @samp{I}, @samp{K}, or @samp{L})
+A constant that cannot be loaded using @code{lui}, @code{addiu}
+or @code{ori}.
 
 @item N
-Negative 16-bit constant
+A constant in the range -65535 to -1 (inclusive).
 
 @item O
-Exact power of two
+A signed 15-bit constant.
 
 @item P
-Positive 16-bit constant
+A constant in the range 1 to 65535 (inclusive).
 
 @item G
-Floating point zero
-
-@item Q
-Memory reference that can be loaded with more than one instruction
-(@samp{m} is preferable for @code{asm} statements)
+Floating-point zero.
 
 @item R
-Memory reference that can be loaded with one instruction
-(@samp{m} is preferable for @code{asm} statements)
-
-@item S
-Memory reference in external OSF/rose PIC format
-(@samp{m} is preferable for @code{asm} statements)
+An address that can be used in a non-macro load or store.
 @end table
 
 @item Motorola 680x0---@file{config/m68k/m68k.h}
@@ -2931,7 +2928,7 @@ The machine mode of @var{op}.
 @code{const_double}.
 @item rval
 @samp{CONST_DOUBLE_REAL_VALUE (@var{op})}, if @var{op} is a floating-point
-@code{const_@/double}.
+@code{const_double}.
 @end table
 
 The @var{*val} variables should only be used once another piece of the
@@ -3041,7 +3038,7 @@ each @samp{>} with @samp{_g}.  Here are some examples:
 @c the @c's prevent double blank lines in the printed manual.
 @example
 @multitable {Original} {Mangled}
-@headitem Original @tab Mangled        @c
+@item @strong{Original} @tab @strong{Mangled}  @c
 @item @code{x}     @tab @code{x}       @c
 @item @code{P42x}  @tab @code{P42x}    @c
 @item @code{P4_x}  @tab @code{P4__x}   @c