i965: Handle nested uniform array indexing
When converting a uniform array reference to a pull constant load, the `reladdr` expression itself may have its own `reladdr`, arbitrarily deeply. This arises from expressions like: a[b[x]] where a, b are uniform arrays (or lowered const arrays), and x is not a constant. Just iterate the lowering to pull constants until we stop seeing these nested. For most shaders, there will be only one pass through this loop. Fixes the piglit test: tests/spec/glsl-1.20/linker/double-indirect-1.shader_test Signed-off-by: Chris Forbes <chrisf@ijw.co.nz> Cc: "10.3 10.4" <mesa-stable@lists.freedesktop.org> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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@ -3353,6 +3353,7 @@ vec4_visitor::move_uniform_array_access_to_pull_constants()
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{
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int pull_constant_loc[this->uniforms];
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memset(pull_constant_loc, -1, sizeof(pull_constant_loc));
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bool nested_reladdr;
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/* Walk through and find array access of uniforms. Put a copy of that
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* uniform in the pull constant buffer.
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@ -3360,44 +3361,51 @@ vec4_visitor::move_uniform_array_access_to_pull_constants()
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* Note that we don't move constant-indexed accesses to arrays. No
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* testing has been done of the performance impact of this choice.
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*/
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foreach_block_and_inst_safe(block, vec4_instruction, inst, cfg) {
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for (int i = 0 ; i < 3; i++) {
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if (inst->src[i].file != UNIFORM || !inst->src[i].reladdr)
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continue;
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do {
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nested_reladdr = false;
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int uniform = inst->src[i].reg;
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foreach_block_and_inst_safe(block, vec4_instruction, inst, cfg) {
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for (int i = 0 ; i < 3; i++) {
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if (inst->src[i].file != UNIFORM || !inst->src[i].reladdr)
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continue;
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/* If this array isn't already present in the pull constant buffer,
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* add it.
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*/
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if (pull_constant_loc[uniform] == -1) {
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const gl_constant_value **values =
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&stage_prog_data->param[uniform * 4];
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int uniform = inst->src[i].reg;
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pull_constant_loc[uniform] = stage_prog_data->nr_pull_params / 4;
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if (inst->src[i].reladdr->reladdr)
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nested_reladdr = true; /* will need another pass */
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assert(uniform < uniform_array_size);
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for (int j = 0; j < uniform_size[uniform] * 4; j++) {
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stage_prog_data->pull_param[stage_prog_data->nr_pull_params++]
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= values[j];
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}
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}
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/* If this array isn't already present in the pull constant buffer,
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* add it.
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*/
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if (pull_constant_loc[uniform] == -1) {
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const gl_constant_value **values =
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&stage_prog_data->param[uniform * 4];
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/* Set up the annotation tracking for new generated instructions. */
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base_ir = inst->ir;
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current_annotation = inst->annotation;
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pull_constant_loc[uniform] = stage_prog_data->nr_pull_params / 4;
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dst_reg temp = dst_reg(this, glsl_type::vec4_type);
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assert(uniform < uniform_array_size);
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for (int j = 0; j < uniform_size[uniform] * 4; j++) {
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stage_prog_data->pull_param[stage_prog_data->nr_pull_params++]
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= values[j];
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}
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}
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emit_pull_constant_load(block, inst, temp, inst->src[i],
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pull_constant_loc[uniform]);
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/* Set up the annotation tracking for new generated instructions. */
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base_ir = inst->ir;
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current_annotation = inst->annotation;
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inst->src[i].file = temp.file;
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inst->src[i].reg = temp.reg;
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inst->src[i].reg_offset = temp.reg_offset;
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inst->src[i].reladdr = NULL;
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dst_reg temp = dst_reg(this, glsl_type::vec4_type);
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emit_pull_constant_load(block, inst, temp, inst->src[i],
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pull_constant_loc[uniform]);
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inst->src[i].file = temp.file;
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inst->src[i].reg = temp.reg;
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inst->src[i].reg_offset = temp.reg_offset;
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inst->src[i].reladdr = NULL;
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}
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}
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}
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} while (nested_reladdr);
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/* Now there are no accesses of the UNIFORM file with a reladdr, so
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* no need to track them as larger-than-vec4 objects. This will be
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