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i965/fs: Read all components of a SSBO field with one send

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Instead of looping through single-component reads, read all components
in one go.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Signed-off-by: Kristian Høgsberg Kristensen <krh@bitplanet.net>
This commit is contained in:
Kristian Høgsberg Kristensen
2015-10-16 21:58:14 -07:00
parent de5a450bd3
commit 24a3a697e5
1 changed files with 7 additions and 18 deletions
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src/mesa/drivers/dri/i965/brw_fs_nir.cpp
+7 -18
View File
@@ -1532,24 +1532,13 @@ fs_visitor::nir_emit_intrinsic(const fs_builder &bld, nir_intrinsic_instr *instr
}
/* Read the vector */
for (int i = 0; i < instr->num_components; i++) {
fs_reg read_result = emit_untyped_read(bld, surf_index, offset_reg,
1 /* dims */, 1 /* size */,
BRW_PREDICATE_NONE);
read_result.type = dest.type;
bld.MOV(dest, read_result);
dest = offset(dest, bld, 1);
/* Vector components are stored contiguous in memory */
if (i < instr->num_components) {
if (!has_indirect) {
const_offset_bytes += 4;
bld.MOV(offset_reg, fs_reg(const_offset_bytes));
} else {
bld.ADD(offset_reg, offset_reg, brw_imm_ud(4));
}
}
}
fs_reg read_result = emit_untyped_read(bld, surf_index, offset_reg,
1 /* dims */,
instr->num_components,
BRW_PREDICATE_NONE);
read_result.type = dest.type;
for (int i = 0; i < instr->num_components; i++)
bld.MOV(offset(dest, bld, i), offset(read_result, bld, i));
break;
}