Ian Romanick
a2bf41ec65
When a = -1.0, pack_half_2x16(vec2(0x0000, 0xBC00)) will produce
0xBC000000. The ishr will produce 0xFFFFBC00. The replacement
pack_half_2x16(vec2(0xBC00, 0x0000)) will produce 0x0000BC00.
Fixes: 1f72857739 ("nir/algebraic: add some half packing optimizations")
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Cc: Connor Abbott <cwabbott0@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4515>
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