### Description
Compute 1/a, store result in d.
### Syntax
```
rcp.approx{.ftz}.f32 d, a; // fast, approximate reciprocal
rcp.rnd{.ftz}.f32 d, a; // IEEE 754 compliant rounding
rcp.rnd.f64 d, a; // IEEE 754 compliant rounding
.rnd = { .rn, .rz, .rm, .rp };
```
### Semantics
```
d = 1 / a;
```
### Examples
```
rcp.approx.ftz.f32 ri,r;
rcp.rn.ftz.f32 xi,x;
rcp.rn.f64 xi,x;
```