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i965/fs: Enables 16-bit load_ubo with sampler

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load_ubo is using 32-bit loads as uniforms surfaces have a 32-bit
surface format defined. So when reading 16-bit components with the
sampler we need to unshuffle two 16-bit components from each 32-bit
component.

Using the sampler avoids the use of the byte_scattered_read message
that needs one message for each component and is supposed to be
slower.

v2: (Jason Ekstrand)
    - Simplify component selection and unshuffling for different bitsizes
    - Remove SKL optimization of reading only two 32-bit components when
      reading 16-bits types.

Reviewed-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
This commit is contained in:
Jason Ekstrand 2017-11-21 00:03:46 +01:00 • committed by Jose Maria Casanova Crespo
parent 3db31c0b06
commit 3282309f74
1 changed files with 14 additions and 7 deletions
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21
src/intel/compiler/brw_fs.cpp
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@ -191,14 +191,21 @@ fs_visitor::VARYING_PULL_CONSTANT_LOAD(const fs_builder &bld,
vec4_result, surf_index, vec4_offset);
inst->size_written = 4 * vec4_result.component_size(inst->exec_size);
if (type_sz(dst.type) == 8) {
shuffle_32bit_load_result_to_64bit_data(
bld, retype(vec4_result, dst.type), vec4_result, 2);
fs_reg dw = offset(vec4_result, bld, (const_offset & 0xf) / 4);
switch (type_sz(dst.type)) {
case 2:
shuffle_32bit_load_result_to_16bit_data(bld, dst, dw, 1);
bld.MOV(dst, subscript(dw, dst.type, (const_offset / 2) & 1));
break;
case 4:
bld.MOV(dst, retype(dw, dst.type));
break;
case 8:
shuffle_32bit_load_result_to_64bit_data(bld, dst, dw, 1);
break;
default:
unreachable("Unsupported bit_size");
}
vec4_result.type = dst.type;
bld.MOV(dst, offset(vec4_result, bld,
(const_offset & 0xf) / type_sz(vec4_result.type)));
}
/**