pan/bi: Don't read base for combined stores
`base` is meaningless for combined stores, so don't read it. This allows us to remove the base index from the intrinsic and simplify the lowering code generating the combined store intrinsic. Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13714>
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@ -574,12 +574,17 @@ bi_emit_fragment_out(bi_builder *b, nir_intrinsic_instr *instr)
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bool emit_blend = writeout & (PAN_WRITEOUT_C);
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bool emit_zs = writeout & (PAN_WRITEOUT_Z | PAN_WRITEOUT_S);
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const nir_variable *var =
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nir_find_variable_with_driver_location(b->shader->nir,
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nir_var_shader_out, nir_intrinsic_base(instr));
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assert(var);
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const nir_variable *var = NULL;
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unsigned loc = ~0;
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if (!combined) {
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var = nir_find_variable_with_driver_location(b->shader->nir,
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nir_var_shader_out, nir_intrinsic_base(instr));
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assert(var);
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loc = var->data.location;
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}
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unsigned loc = var->data.location;
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bi_index src0 = bi_src_index(&instr->src[0]);
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/* By ISA convention, the coverage mask is stored in R60. The store
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@ -595,7 +600,7 @@ bi_emit_fragment_out(bi_builder *b, nir_intrinsic_instr *instr)
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/* Dual-source blending is implemented by putting the color in
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* registers r4-r7. */
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if (var->data.index) {
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if (var && var->data.index) {
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unsigned count = nir_src_num_components(instr->src[0]);
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for (unsigned i = 0; i < count; ++i)
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@ -643,9 +648,7 @@ bi_emit_fragment_out(bi_builder *b, nir_intrinsic_instr *instr)
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}
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if (emit_blend) {
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assert(loc >= FRAG_RESULT_DATA0);
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unsigned rt = (loc - FRAG_RESULT_DATA0);
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unsigned rt = combined ? 0 : (loc - FRAG_RESULT_DATA0);
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bi_index color = bi_src_index(&instr->src[0]);
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/* Explicit copy since BLEND inputs are precoloured to R0-R3,
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