aco: fix non-rtz pack_half_2x16

We were using the wrong conversion opcode. The high bits are also not
zero'd on GFX10, which can cause v_cvt_pk_u16_u32 to clamp.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Fixes: df645fa369d ('aco: implement VK_KHR_shader_float_controls')
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6346>
(cherry picked from commit 9c1e0d86a813af7609acf42cfe6bec7401d6405f)
2 files changed