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pan/midgard: Add emit_explicit_constant helper

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We generalize the constant emission helper used in fragment writeout as
we'll also need it for vertex outputs.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This commit is contained in:
Alyssa Rosenzweig
2019-07-24 12:52:27 -07:00
parent eedd6c1dd0
commit e169301bd8
1 changed files with 16 additions and 10 deletions
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src/panfrost/midgard/midgard_compile.c
+16 -10
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@@ -530,6 +530,21 @@ emit_load_const(compiler_context *ctx, nir_load_const_instr *instr)
_mesa_hash_table_u64_insert(ctx->ssa_constants, def.index + 1, v);
}
/* Normally constants are embedded implicitly, but for I/O and such we have to
* explicitly emit a move with the constant source */
static void
emit_explicit_constant(compiler_context *ctx, unsigned node, unsigned to)
{
void *constant_value = _mesa_hash_table_u64_search(ctx->ssa_constants, node + 1);
if (constant_value) {
midgard_instruction ins = v_mov(SSA_FIXED_REGISTER(REGISTER_CONSTANT), blank_alu_src, to);
attach_constants(ctx, &ins, constant_value, node + 1);
emit_mir_instruction(ctx, ins);
}
}
static unsigned
nir_src_index(compiler_context *ctx, nir_src *src)
{
@@ -2077,16 +2092,7 @@ midgard_opt_pos_propagate(compiler_context *ctx, midgard_block *block)
static void
emit_fragment_epilogue(compiler_context *ctx)
{
/* Special case: writing out constants requires us to include the move
* explicitly now, so shove it into r0 */
void *constant_value = _mesa_hash_table_u64_search(ctx->ssa_constants, ctx->fragment_output + 1);
if (constant_value) {
midgard_instruction ins = v_mov(SSA_FIXED_REGISTER(REGISTER_CONSTANT), blank_alu_src, SSA_FIXED_REGISTER(0));
attach_constants(ctx, &ins, constant_value, ctx->fragment_output + 1);
emit_mir_instruction(ctx, ins);
}
emit_explicit_constant(ctx, ctx->fragment_output, SSA_FIXED_REGISTER(0));
/* Perform the actual fragment writeout. We have two writeout/branch
* instructions, forming a loop until writeout is successful as per the