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nir: Add preserve_mediump as a shader compiler option

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The DXIL backend would like to distinguish between casts to 16-bit
that must cast, vs those that may. If a shader only ever produces
16-bit types from mediump casts and ALU ops on those values, then
the resulting shader can be annotated with DXIL's min-precision
qualifier, basically telling the driver to use 16-bit precision if
it's faster for them. If it uses concrete 16-bit casts, or loads/
stores to externally-visible memory, then it must use the "native"
16-bit flag, which is not supported on all hardware.

Acked-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23344>
This commit is contained in:
Jesse Natalie 2023-05-31 13:10:47 -07:00 • committed by Marge Bot
parent cb965b207e
commit 2d3fbb44f4
2 changed files with 12 additions and 7 deletions
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5
src/compiler/nir/nir.h
View file

@ -3932,6 +3932,11 @@ typedef struct nir_shader_compiler_options {
* of adding it to the atomic source
*/
bool lower_atomic_offset_to_range_base;
/** Don't convert medium-precision casts (e.g. f2fmp) into concrete
* type casts (e.g. f2f16).
*/
bool preserve_mediump;
} nir_shader_compiler_options;
typedef struct nir_shader {

14
src/compiler/nir/nir_opt_algebraic.py
View file

@ -3124,13 +3124,13 @@ late_optimizations += [
# Convert *2*mp instructions to concrete *2*16 instructions. At this point
# any conversions that could have been removed will have been removed in
# nir_opt_algebraic so any remaining ones are required.
(('f2fmp', a), ('f2f16', a)),
(('f2imp', a), ('f2i16', a)),
(('f2ump', a), ('f2u16', a)),
(('i2imp', a), ('i2i16', a)),
(('i2fmp', a), ('i2f16', a)),
(('i2imp', a), ('u2u16', a)),
(('u2fmp', a), ('u2f16', a)),
(('f2fmp', a), ('f2f16', a), "!options->preserve_mediump"),
(('f2imp', a), ('f2i16', a), "!options->preserve_mediump"),
(('f2ump', a), ('f2u16', a), "!options->preserve_mediump"),
(('i2imp', a), ('i2i16', a), "!options->preserve_mediump"),
(('i2fmp', a), ('i2f16', a), "!options->preserve_mediump"),
(('i2imp', a), ('u2u16', a), "!options->preserve_mediump"),
(('u2fmp', a), ('u2f16', a), "!options->preserve_mediump"),
(('fisfinite', a), ('flt', ('fabs', a), float("inf"))),
(('fcsel', ('slt', 0, a), b, c), ('fcsel_gt', a, b, c), "options->has_fused_comp_and_csel"),