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nir: Add a pass to lower mediump temps and shared mem.

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SPIRV and GLSL are reasonable at converting ALU ops to mediump, but
variable storage would be wrapped in a 2f32/2mp on store/load, and if
nir_vars_to_ssa doesn't make that storage go away then you'd have extra
conversions.  For compute shader shared mem, you'd waste memory too.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18259>
This commit is contained in:
Emma Anholt
2022-08-23 14:54:37 -07:00
committed by Marge Bot
parent 65c00ba7cb
commit 0cee5f3918
4 changed files with 210 additions and 0 deletions
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src/compiler/nir/nir.h
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@@ -5345,6 +5345,7 @@ bool nir_lower_doubles(nir_shader *shader, const nir_shader *softfp64,
bool nir_lower_pack(nir_shader *shader);
bool nir_recompute_io_bases(nir_shader *nir, nir_variable_mode modes);
bool nir_lower_mediump_vars(nir_shader *nir, nir_variable_mode modes);
bool nir_lower_mediump_io(nir_shader *nir, nir_variable_mode modes,
uint64_t varying_mask, bool use_16bit_slots);
bool nir_force_mediump_io(nir_shader *nir, nir_variable_mode modes,