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nak: Lower 8 and 16-bit types

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We can do some of these on some hardware but we'll lower them all for
now.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24998>
This commit is contained in:
Faith Ekstrand 2023-01-30 20:53:18 -06:00 • committed by Marge Bot
parent 8f121036ea
commit 44243c4741
1 changed files with 71 additions and 0 deletions
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71
src/nouveau/compiler/nak_nir.c
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@ -106,6 +106,75 @@ nak_optimize_nir(nir_shader *nir, const struct nak_compiler *nak)
optimize_nir(nir, nak, false);
}
static unsigned
lower_bit_size_cb(const nir_instr *instr, void *_data)
{
switch (instr->type) {
case nir_instr_type_alu: {
nir_alu_instr *alu = nir_instr_as_alu(instr);
switch (alu->op) {
case nir_op_bit_count:
case nir_op_ufind_msb:
case nir_op_ifind_msb:
case nir_op_find_lsb:
/* These are handled specially because the destination is always
* 32-bit and so the bit size of the instruction is given by the
* source.
*/
return alu->src[0].src.ssa->bit_size == 32 ? 0 : 32;
default:
break;
}
if (alu->def.bit_size >= 32)
return 0;
/* TODO: Some hardware has native 16-bit support */
if (alu->def.bit_size & (8 | 16))
return 32;
return 0;
}
case nir_instr_type_intrinsic: {
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
switch (intrin->intrinsic) {
case nir_intrinsic_vote_feq:
case nir_intrinsic_vote_ieq:
case nir_intrinsic_read_invocation:
case nir_intrinsic_read_first_invocation:
case nir_intrinsic_shuffle:
case nir_intrinsic_shuffle_xor:
case nir_intrinsic_shuffle_up:
case nir_intrinsic_shuffle_down:
case nir_intrinsic_quad_broadcast:
case nir_intrinsic_quad_swap_horizontal:
case nir_intrinsic_quad_swap_vertical:
case nir_intrinsic_quad_swap_diagonal:
case nir_intrinsic_reduce:
case nir_intrinsic_inclusive_scan:
case nir_intrinsic_exclusive_scan:
if (intrin->src[0].ssa->bit_size != 32)
return 32;
return 0;
default:
return 0;
}
}
case nir_instr_type_phi: {
nir_phi_instr *phi = nir_instr_as_phi(instr);
if (phi->def.bit_size != 32)
return 32;
return 0;
}
default:
return 0;
}
}
void
nak_preprocess_nir(nir_shader *nir, const struct nak_compiler *nak)
{
@ -113,6 +182,8 @@ nak_preprocess_nir(nir_shader *nir, const struct nak_compiler *nak)
nir_validate_ssa_dominance(nir, "before nak_preprocess_nir");
OPT(nir, nir_lower_bit_size, lower_bit_size_cb, (void *)nak);
const nir_lower_tex_options tex_options = {
.lower_txp = ~0,
/* TODO: More lowering */