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aco: optimize some masked swizzles to DPP

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Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5695>
This commit is contained in:
Rhys Perry 2020-07-02 12:12:12 +01:00 • committed by Marge Bot
parent 09f48de582
commit d377fbf95d
2 changed files with 40 additions and 3 deletions
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7
src/amd/compiler/aco_builder_h.py
View file

@ -69,6 +69,13 @@ dpp_row_sr(unsigned amount)
return (dpp_ctrl)(((unsigned) _dpp_row_sr) | amount);
}
inline dpp_ctrl
dpp_row_rr(unsigned amount)
{
assert(amount > 0 && amount < 16);
return (dpp_ctrl)(((unsigned) _dpp_row_rr) | amount);
}
inline unsigned
ds_pattern_bitmode(unsigned and_mask, unsigned or_mask, unsigned xor_mask)
{

36
src/amd/compiler/aco_instruction_selection.cpp
View file

@ -207,6 +207,36 @@ static Temp emit_bpermute(isel_context *ctx, Builder &bld, Temp index, Temp data
}
}
static Temp emit_masked_swizzle(isel_context *ctx, Builder &bld, Temp src, unsigned mask)
{
if (ctx->options->chip_class >= GFX8) {
unsigned and_mask = mask & 0x1f;
unsigned or_mask = (mask >> 5) & 0x1f;
unsigned xor_mask = (mask >> 10) & 0x1f;
uint16_t dpp_ctrl = 0xffff;
// TODO: we could use DPP8 for some swizzles
if (and_mask == 0x1f && or_mask < 4 && xor_mask < 4) {
unsigned res[4] = {0, 1, 2, 3};
for (unsigned i = 0; i < 4; i++)
res[i] = ((res[i] | or_mask) ^ xor_mask) & 0x3;
dpp_ctrl = dpp_quad_perm(res[0], res[1], res[2], res[3]);
} else if (and_mask == 0x1f && !or_mask && xor_mask == 8) {
dpp_ctrl = dpp_row_rr(8);
} else if (and_mask == 0x1f && !or_mask && xor_mask == 0xf) {
dpp_ctrl = dpp_row_mirror;
} else if (and_mask == 0x1f && !or_mask && xor_mask == 0x7) {
dpp_ctrl = dpp_row_half_mirror;
}
if (dpp_ctrl != 0xffff)
return bld.vop1_dpp(aco_opcode::v_mov_b32, bld.def(v1), src, dpp_ctrl);
}
return bld.ds(aco_opcode::ds_swizzle_b32, bld.def(v1), src, mask, 0, false);
}
Temp as_vgpr(isel_context *ctx, Temp val)
{
if (val.type() == RegType::sgpr) {
@ -7923,13 +7953,13 @@ void visit_intrinsic(isel_context *ctx, nir_intrinsic_instr *instr)
uint32_t mask = nir_intrinsic_swizzle_mask(instr);
if (dst.regClass() == v1) {
emit_wqm(ctx,
bld.ds(aco_opcode::ds_swizzle_b32, bld.def(v1), src, mask, 0, false),
emit_masked_swizzle(ctx, bld, src, mask),
dst);
} else if (dst.regClass() == v2) {
Temp lo = bld.tmp(v1), hi = bld.tmp(v1);
bld.pseudo(aco_opcode::p_split_vector, Definition(lo), Definition(hi), src);
lo = emit_wqm(ctx, bld.ds(aco_opcode::ds_swizzle_b32, bld.def(v1), lo, mask, 0, false));
hi = emit_wqm(ctx, bld.ds(aco_opcode::ds_swizzle_b32, bld.def(v1), hi, mask, 0, false));
lo = emit_wqm(ctx, emit_masked_swizzle(ctx, bld, lo, mask));
hi = emit_wqm(ctx, emit_masked_swizzle(ctx, bld, hi, mask));
bld.pseudo(aco_opcode::p_create_vector, Definition(dst), lo, hi);
emit_split_vector(ctx, dst, 2);
} else {