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pan/bi: Stub FAU lowering pass

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A given tuple can only load a single entry from FAU-RAM, so we need a
lowering pass before scheduling to assign FAU and lower the other
sources to moves.

Right now this only handles constants. Uniforms and general FAU are
todo.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8135>
This commit is contained in:
Alyssa Rosenzweig 2020-12-30 15:50:36 -05:00 • committed by Marge Bot
parent 239ef52216
commit 73169aa0b4
1 changed files with 51 additions and 0 deletions
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51
src/panfrost/bifrost/bifrost_compile.c
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@ -3922,6 +3922,57 @@ glsl_type_size(const struct glsl_type *type, bool bindless)
return glsl_count_attribute_slots(type, false);
}
static unsigned
bi_lower_constant(bi_builder *b, bi_instr *ins, unsigned s, uint32_t *accum, unsigned cwords, bool allow_constant)
{
uint32_t value = ins->src[s].value;
/* Staging registers can't have constants */
allow_constant &= !(s == 0 && bi_opcode_props[ins->op].sr_read);
/* If we're allowed any inline constants, see if this one works */
if (allow_constant) {
for (unsigned i = 0; i < cwords; ++i) {
if (value == accum[i])
return cwords;
}
if (value == 0 && !bi_opcode_props[ins->op].add)
return cwords;
if (cwords < 2) {
accum[cwords] = value;
return cwords + 1;
}
}
/* should be const folded */
assert(!ins->src[s].abs && !ins->src[s].neg);
enum bi_swizzle old_swizzle = ins->src[s].swizzle;
b->cursor = bi_before_instr(ins);
ins->src[s] = bi_mov_i32(b, bi_imm_u32(value));
ins->src[s].swizzle = old_swizzle;
return cwords;
}
static void
bi_lower_fau(bi_context *ctx, bi_block *block)
{
bi_builder b = bi_init_builder(ctx);
bi_foreach_instr_in_block_safe(block, _ins) {
bi_instr *ins = (bi_instr *) _ins;
uint32_t constants[2];
unsigned cwords = 0;
bi_foreach_src(ins, s) {
if (ins->src[s].type == BI_INDEX_CONSTANT)
cwords = bi_lower_constant(&b, ins, s, constants, cwords, true);
}
}
}
static void
bi_optimize_nir(nir_shader *nir)
{