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ir3/nir: Lower indirect references of compact variables

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Fixes Sascha Willems "tessellation" demo on Turnip (it contains
indirect dereference of tessellation levels).

Fixes: 643f2cb ("ir3, tu: Cleanup indirect i/o lowering")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11781>
This commit is contained in:
Connor Abbott 2021-07-08 12:39:22 +02:00 • committed by Marge Bot
parent 57f54bb9cc
commit d53984ce97
1 changed files with 12 additions and 0 deletions
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12
src/freedreno/ir3/ir3_nir.c
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@ -332,6 +332,18 @@ ir3_nir_lower_io_to_temporaries(nir_shader *s)
NIR_PASS_V(s, nir_lower_var_copies);
NIR_PASS_V(s, nir_lower_global_vars_to_local);
}
/* Regardless of the above, we need to lower indirect references to
* compact variables such as clip/cull distances because due to how
* TCS<->TES IO works we cannot handle indirect accesses that "straddle"
* vec4 components. nir_lower_indirect_derefs has a special case for
* compact variables, so it will actually lower them even though we pass
* in 0 modes.
*
* Using temporaries would be slightly better but
* nir_lower_io_to_temporaries currently doesn't support TCS i/o.
*/
NIR_PASS_V(s, nir_lower_indirect_derefs, 0, UINT32_MAX);
}
void