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nir: Add lowering support for unpacking opcodes.

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Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
This commit is contained in:
Matt Turner
2016-01-25 11:07:02 -08:00
parent 9b8786eba9
commit 955d052058
2 changed files with 32 additions and 0 deletions
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4
src/compiler/nir/nir.h
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@@ -1474,6 +1474,10 @@ typedef struct nir_shader_compiler_options {
bool lower_pack_unorm_4x8;
bool lower_pack_snorm_4x8;
bool lower_unpack_half_2x16;
bool lower_unpack_unorm_2x16;
bool lower_unpack_snorm_2x16;
bool lower_unpack_unorm_4x8;
bool lower_unpack_snorm_4x8;
bool lower_extract_byte;
bool lower_extract_word;

28
src/compiler/nir/nir_opt_algebraic.py
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@@ -278,6 +278,34 @@ optimizations = [
('pack_uvec4_to_uint',
('f2i', ('fround_even', ('fmul', ('fmin', 1.0, ('fmax', -1.0, 'v')), 127.0)))),
'options->lower_pack_snorm_4x8'),
(('unpack_unorm_2x16', 'v'),
('fdiv', ('u2f', ('vec2', ('extract_u16', 'v', 0),
('extract_u16', 'v', 1))),
65535.0),
'options->lower_unpack_unorm_2x16'),
(('unpack_unorm_4x8', 'v'),
('fdiv', ('u2f', ('vec4', ('extract_u8', 'v', 0),
('extract_u8', 'v', 1),
('extract_u8', 'v', 2),
('extract_u8', 'v', 3))),
255.0),
'options->lower_unpack_unorm_4x8'),
(('unpack_snorm_2x16', 'v'),
('fmin', 1.0, ('fmax', -1.0, ('fdiv', ('i2f', ('vec2', ('extract_i16', 'v', 0),
('extract_i16', 'v', 1))),
32767.0))),
'options->lower_unpack_snorm_2x16'),
(('unpack_snorm_4x8', 'v'),
('fmin', 1.0, ('fmax', -1.0, ('fdiv', ('i2f', ('vec4', ('extract_i8', 'v', 0),
('extract_i8', 'v', 1),
('extract_i8', 'v', 2),
('extract_i8', 'v', 3))),
127.0))),
'options->lower_unpack_snorm_4x8'),
]
# Add optimizations to handle the case where the result of a ternary is