### Description
Convert a const, Kernel Function Parameters
(.param), global, local, or shared address to a generic address, or vice-versa. The
source and destination addresses must be the same size. Use cvt.u32.u64 or cvt.u64.u32 to
truncate or zero-extend addresses.
For variables declared in .const,
Kernel Function Parameters (.param), .global, .local, or .shared
state space, the generic address of the variable may be taken using cvta. The source is either a
register or a variable defined in const,
Kernel Function Parameters (.param), global, local, or shared memory
with an optional offset.
When converting a generic address into a const,
Kernel Function Parameters (.param), global, local, or shared
address, the resulting address is undefined in cases where the generic address does not fall within
the address window of the specified state space. A program may use isspacep to guard against
such incorrect behavior.
For cvta with .shared state space, the address must belong to the space specified by
::cta or ::cluster sub-qualifier, otherwise the behavior is undefined. If no sub-qualifier
is specified with .shared state space, then ::cta is assumed by default.
If .param is specified without any sub-qualifiers then it defaults to .param::entry. For
.param{::entry} state space, operand a must be a kernel parameter address, otherwise
behavior is undefined.
### Syntax
```
// convert const, global, local, or shared address to generic address
cvta.space.size p, a; // source address in register a
cvta.space.size p, var; // get generic address of var
cvta.space.size p, var+imm; // generic address of var+offset
// convert generic address to const, global, local, or shared address
cvta.to.space.size p, a;
.space = { .const, .global, .local, .shared{::cta, ::cluster}, .param{::entry} };
.size = { .u32, .u64 };
```
### Examples
```
cvta.const.u32 ptr,cvar;
cvta.local.u32 ptr,lptr;
cvta.shared::cta.u32 p,As+4;
cvta.shared::cluster.u32 ptr, As;
cvta.to.global.u32 p,gptr;
cvta.param.u64 ptr,pvar;
cvta.to.param::entry.u64 epptr, ptr;
```