Names that are not thus known and used in RTL-generation have no
effect; they are equivalent to no name at all.
+For the purpose of debugging the compiler, you may also specify a
+name beginning with the @samp{*} character. Such a name is used only
+for identifying the instruction in RTL dumps; it is entirely equivalent
+to having a nameless pattern for all other purposes.
+
@item
The @dfn{RTL template} (@pxref{RTL Template}) is a vector of incomplete
RTL expressions which show what the instruction should look like. It is
independent @samp{E} or @samp{F} instead)
@end table
+@item AVR family---@file{avr.h}
+@table @code
+@item l
+Registers from r0 to r15
+
+@item a
+Registers from r16 to r23
+
+@item d
+Registers from r16 to r31
+
+@item w
+Register from r24 to r31. This registers can be used in @samp{addw} command
+
+@item e
+Pointer register (r26 - r31)
+
+@item b
+Base pointer register (r28 - r31)
+
+@item t
+Temporary register r0
+
+@item x
+Register pair X (r27:r26)
+
+@item y
+Register pair Y (r29:r28)
+
+@item z
+Register pair Z (r31:r30)
+
+@item I
+Constant greater than -1, less than 64
+
+@item J
+Constant greater than -64, less than 1
+
+@item K
+Constant integer 2
+
+@item L
+Constant integer 0
+
+@item M
+Constant that fits in 8 bits
+
+@item N
+Constant integer -1
+
+@item O
+Constant integer 8
+
+@item P
+Constant integer 1
+
+@item G
+A floating point constant 0.0
+@end table
+
@item IBM RS6000---@file{rs6000.h}
@table @code
@item b
to mode @var{m}. The effect on the rest of the register is undefined.
This class of patterns is special in several ways. First of all, each
-of these names @emph{must} be defined, because there is no other way
-to copy a datum from one place to another.
+of these names up to and including full word size @emph{must} be defined,
+because there is no other way to copy a datum from one place to another.
+If there are patterns accepting operands in larger modes,
+@samp{mov@var{m}} must be defined for integer modes of those sizes.
Second, these patterns are not used solely in the RTL generation pass.
Even the reload pass can generate move insns to copy values from stack
The above discussion also applies to the @samp{mov@var{mode}cc} and
@samp{s@var{cond}} patterns.
+@cindex @code{jump} instruction pattern
+@item @samp{jump}
+A jump inside a function; an unconditional branch. Operand 0 is the
+@code{label_ref} of the label to jump to. This pattern name is mandatory
+on all machines.
+
@cindex @code{call} instruction pattern
@item @samp{call}
Subroutine call instruction returning no value. Operand 0 is the
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