From 4b1a14fd47134a3810f9c15d137af4336819e081 Mon Sep 17 00:00:00 2001 From: Andreas Baierl Date: Tue, 20 Aug 2019 18:19:55 +0200 Subject: lima/ppir: Add undef handling Add a ppir dummy node for nir_ssa_undef_instr, create a reg for it and mark it as undefined, so that regalloc can set it non-interfering to avoid register pressure. Signed-off-by: Andreas Baierl Reviewed-by: Vasily Khozuzhick Reviewed-by: Erico Nunes --- src/gallium/drivers/lima/ir/pp/nir.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) (limited to 'src/gallium/drivers/lima/ir/pp/nir.c') diff --git a/src/gallium/drivers/lima/ir/pp/nir.c b/src/gallium/drivers/lima/ir/pp/nir.c index faccb9dea2d..13b117eb183 100644 --- a/src/gallium/drivers/lima/ir/pp/nir.c +++ b/src/gallium/drivers/lima/ir/pp/nir.c @@ -142,7 +142,8 @@ static void ppir_node_add_src(ppir_compiler *comp, ppir_node *node, break; } - ppir_node_add_dep(node, child); + if (child->op != ppir_op_undef) + ppir_node_add_dep(node, child); } else { nir_register *reg = ns->reg.reg; @@ -418,8 +419,19 @@ static ppir_node *ppir_emit_load_const(ppir_block *block, nir_instr *ni) static ppir_node *ppir_emit_ssa_undef(ppir_block *block, nir_instr *ni) { - ppir_error("nir_ssa_undef_instr not support\n"); - return NULL; + nir_ssa_undef_instr *undef = nir_instr_as_ssa_undef(ni); + ppir_node *node = ppir_node_create_ssa(block, ppir_op_undef, &undef->def); + if (!node) + return NULL; + ppir_alu_node *alu = ppir_node_to_alu(node); + + ppir_dest *dest = &alu->dest; + dest->ssa.undef = true; + ppir_reg *ssa = &dest->ssa; + + list_add(&ssa->list, &block->comp->reg_list); + + return node; } static ppir_node *ppir_emit_tex(ppir_block *block, nir_instr *ni) -- cgit v1.2.1