Interpolation attribute and channel:
Syntax Description attr{0..32}.x Attribute 0..32 with x channel. attr{0..32}.y Attribute 0..32 with y channel. attr{0..32}.z Attribute 0..32 with z channel. attr{0..32}.w Attribute 0..32 with w channel.
Examples:
v_interp_p1_f32 v1, v0, attr0.x v_interp_p1_f32 v1, v0, attr32.w