From ff16e72545bdcf26ae02475d90f911d31518928e Mon Sep 17 00:00:00 2001 From: Brian Ho Date: Fri, 24 Apr 2020 08:22:20 -0700 Subject: [PATCH] turnip: Offset by component when lowering gl_TessLevel* lower_tess_ctrl_block assumes that the gl_TessLevel* intrinsic_store_outputs have already been collapsed into a single instruction before the tess lowering step: store_output ... /* base=0 */ /* wrmask=xyzw */ /* component=0 */ store_output ... /* base=1 */ /* wrmask=xy */ /* component=0 */ While this is true in fd because of st_nir_vectorize_io, we don't do the same lowering in turnip so each tess level component still has its own store instruction: store_output ... /* base=0 */ /* wrmask=x */ /* component=0 */ store_output ... /* base=0 */ /* wrmask=x */ /* component=1 */ store_output ... /* base=0 */ /* wrmask=x */ /* component=2 */ store_output ... /* base=0 */ /* wrmask=x */ /* component=3 */ store_output ... /* base=1 */ /* wrmask=x */ /* component=0 */ store_output ... /* base=1 */ /* wrmask=x */ /* component=1 */ This commit adds a component offset to the tess control lowering. An alternative is to also perform nir_lower_io_to_vector in turnip, but ir3 seems to generate the same assembly either way and it's nice to not have a lowering prereq before tess lowering. Part-of: --- src/freedreno/ir3/ir3_nir_lower_tess.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/src/freedreno/ir3/ir3_nir_lower_tess.c b/src/freedreno/ir3/ir3_nir_lower_tess.c index 458b29848a0..bdb98f3d935 100644 --- a/src/freedreno/ir3/ir3_nir_lower_tess.c +++ b/src/freedreno/ir3/ir3_nir_lower_tess.c @@ -503,9 +503,12 @@ lower_tess_ctrl_block(nir_block *block, nir_builder *b, struct state *state) b->cursor = nir_before_instr(&intr->instr); if (levels) { - for (int i = 0; i < 4; i++) - if (nir_intrinsic_write_mask(intr) & (1 << i)) - levels[i] = nir_channel(b, intr->src[0].ssa, i); + for (int i = 0; i < 4; i++) { + if (nir_intrinsic_write_mask(intr) & (1 << i)) { + uint32_t component = nir_intrinsic_component(intr); + levels[i + component] = nir_channel(b, intr->src[0].ssa, i); + } + } nir_instr_remove(&intr->instr); } else { nir_ssa_def *address = nir_load_tess_param_base_ir3(b); -- 2.30.2