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i965/fs: Pass a BAD_FILE register to the logical FB write when oMask is unused.

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This will let the optimizer know that the sample mask value is unused
so its definition can be DCE'ed.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Francisco Jerez 2016-04-29 19:47:44 -07:00
parent aac90ba292
commit b0c8e5e0c8
2 changed files with 3 additions and 2 deletions
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2
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -3797,7 +3797,7 @@ lower_fb_write_logical_send(const fs_builder &bld, fs_inst *inst,
length++;
}
if (prog_data->uses_omask) {
if (sample_mask.file != BAD_FILE) {
sources[length] = fs_reg(VGRF, bld.shader->alloc.allocate(1),
BRW_REGISTER_TYPE_UD);

3
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
View file

@ -394,7 +394,8 @@ fs_visitor::emit_single_fb_write(const fs_builder &bld,
const fs_reg sources[] = {
color0, color1, src0_alpha, src_depth, dst_depth, src_stencil,
sample_mask, brw_imm_ud(components)
(prog_data->uses_omask ? sample_mask : fs_reg()),
brw_imm_ud(components)
};
assert(ARRAY_SIZE(sources) - 1 == FB_WRITE_LOGICAL_SRC_COMPONENTS);
fs_inst *write = bld.emit(FS_OPCODE_FB_WRITE_LOGICAL, fs_reg(),