<p>
Storage-and-storage instructions such as <code>MVC</code> and <code>XC</code> are written
with the length as the first argument.
For example, <code>XC</code> <code>$8,</code> <code>(R9),</code> <code>(R9)</code> would clear
eight bytes at the address specified in <code>R9</code>.
</p>

<p>
If a vector instruction takes a length or an index as an argument then it will be the
first argument.

pkg syscall (freebsd-riscv64), const RTV_SSTHRESH = 32 #53466
pkg syscall (freebsd-riscv64), const RTV_SSTHRESH ideal-int #53466
pkg syscall (freebsd-riscv64), const RTV_WEIGHT = 256 #53466
pkg syscall (freebsd-riscv64), const RTV_WEIGHT ideal-int #53466
pkg syscall (freebsd-riscv64), const RT_CACHING_CONTEXT = 1 #53466
pkg syscall (freebsd-riscv64), const RT_CACHING_CONTEXT ideal-int #53466

repeating the previous list.  The number of identifiers must be equal
to the number of expressions in the previous list.
Together with the <a href="#Iota"><code>iota</code> constant generator</a>
this mechanism permits light-weight declaration of sequential values:
</p>

<pre>
const (
	Sunday = iota
	Monday
	Tuesday
	Wednesday
	Thursday
	Friday
	Partyday
	numberOfDays  // this constant is not exported

pkg syscall (freebsd-arm64), const RTV_SSTHRESH = 32
pkg syscall (freebsd-arm64), const RTV_SSTHRESH ideal-int
pkg syscall (freebsd-arm64), const RTV_WEIGHT = 256
pkg syscall (freebsd-arm64), const RTV_WEIGHT ideal-int
pkg syscall (freebsd-arm64), const RUSAGE_CHILDREN = -1
pkg syscall (freebsd-arm64), const RUSAGE_CHILDREN ideal-int
pkg syscall (freebsd-arm64), const RUSAGE_SELF = 0

repeating the previous list.  The number of identifiers must be equal
to the number of expressions in the previous list.
Together with the <a href="#Iota"><code>iota</code> constant generator</a>
this mechanism permits light-weight declaration of sequential values:
</p>

<pre>
const (
	Sunday = iota
	Monday
	Tuesday
	Wednesday
	Thursday
	Friday
	Partyday
	numberOfDays  // this constant is not exported