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aco/isel: Improve vector splits for image_bvh8_intersect_ray

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Using split_vector to split everything into scalars allows copy-prop to
eliminate the final p_create_vector. Considerably reduces copies and
register thrashing.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35269>
This commit is contained in:
Natalie Vock 2025-04-17 19:45:11 +02:00 • committed by Marge Bot
parent 76f1e08222
commit f17fe05e32
1 changed files with 11 additions and 2 deletions
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13
src/amd/compiler/instruction_selection/aco_select_nir_intrinsics.cpp
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@ -1850,9 +1850,18 @@ visit_bvh8_intersect_ray_amd(isel_context* ctx, nir_intrinsic_instr* instr)
mimg->dmask = 0xf;
mimg->unrm = true;
mimg->r128 = true;
emit_split_vector(ctx, result, 10);
emit_split_vector(ctx, new_origin, 3);
emit_split_vector(ctx, new_dir, 3);
bld.pseudo(aco_opcode::p_create_vector, Definition(dst), Operand(result), Operand(new_origin),
Operand(new_dir));
Temp vec[16];
for (unsigned i = 0; i < 10; ++i)
vec[i] = emit_extract_vector(ctx, result, i, RegClass::v1);
for (unsigned i = 0; i < 3; ++i) {
vec[10 + i] = emit_extract_vector(ctx, new_origin, i, RegClass::v1);
vec[13 + i] = emit_extract_vector(ctx, new_dir, i, RegClass::v1);
}
create_vec_from_array(ctx, vec, 16, RegType::vgpr, 4, 0, dst);
}
static std::vector<Temp>