Prototype:

i32 @__nv_byte_perm(i32 %x, i32 %y, i32 %z) 

Description:

__nv_byte_perm(x,y,s) returns a 32-bit integer consisting of four bytes from eight input bytes provided in the two input integers x and y, as specified by a selector, s.

The input bytes are indexed as follows:

 input[0] = x<7:0>   input[1] = x<15:8>
 input[2] = x<23:16> input[3] = x<31:24>
 input[4] = y<7:0>   input[5] = y<15:8>
 input[6] = y<23:16> input[7] = y<31:24>
 

The selector indices are as follows (the upper 16-bits of the selector are not used):

 selector[0] = s<2:0>  selector[1] = s<6:4>
 selector[2] = s<10:8> selector[3] = s<14:12>
 

Returns:

The returned value r is computed to be: result[n] := input[selector[n]] where result[n] is the nth byte of r.

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes