Eric Anholt
f301eec9a3
In nouveau's PBO path with GS support and no VS layer export, we got:
intrinsic store_output (ssa_1, ssa_0) (0, 15, 0, 160, 128) /* base=0 */ /* wrmask=xyzw */ /* component=0 */ /* src_type=float32 */ /* location=0 slots=1 */ /* out_pos */
[...]
vec3 32 ssa_4 = mov ssa_3.xxx
intrinsic store_output (ssa_4, ssa_0) (0, 4, 0, 160, 128) /* base=0 */ /* wrmask=z */ /* component=0 */ /* src_type=float32 */ /* location=0 slots=1 *//* out_pos */
The mov's SSA value we would decide we could store directly to the output,
since nothing else used it. However, the store has a writemask, and the
ALU op was stomping over it instead of ANDing with the output decl's
existing writemask.
Fixes: f79f382c81 ("nir_to_tgsi: Store directly to TGSI outputs when possible.")
Closes: #4380
Tested-by: Ilia Mirkin <imirkin@alum.mit.edu>
Acked-by: Ilia Mirkin <imirkin@alum.mit.edu>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9376>
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