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nir: Add NVIDIA-specific I/O intrinsics

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NVIDIA hardware doesn't take a vertex index for per-vertex I/O.
Instead, it takes an offset into the primitive.  This has to be fetched
using a combination of SR_INVOCATION_INFO and the ISBERD instruction.
To keep things simple and allow for maximum CSE, we do the lowering in
NIR and patch the load/store_per_vertex_input/output intrinsic.

Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25000>
This commit is contained in:
Faith Ekstrand 2023-09-30 02:16:51 -05:00 • committed by Marge Bot
parent 8188842fdc
commit 1fa7c37a36
3 changed files with 17 additions and 0 deletions
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1
src/compiler/nir/nir.h
View file

@ -2085,6 +2085,7 @@ nir_intrinsic_can_reorder(nir_intrinsic_instr *instr)
instr->intrinsic == nir_intrinsic_bindless_image_load ||
instr->intrinsic == nir_intrinsic_image_deref_load ||
instr->intrinsic == nir_intrinsic_image_load ||
instr->intrinsic == nir_intrinsic_ald_nv ||
instr->intrinsic == nir_intrinsic_load_sysval_nv) {
return nir_intrinsic_access(instr) & ACCESS_CAN_REORDER;
} else {

3
src/compiler/nir/nir_divergence_analysis.c
View file

@ -614,6 +614,9 @@ visit_intrinsic(nir_shader *shader, nir_intrinsic_instr *instr)
case nir_intrinsic_load_ray_triangle_vertex_positions:
case nir_intrinsic_cmat_extract:
case nir_intrinsic_cmat_muladd_amd:
case nir_intrinsic_isberd_nv:
case nir_intrinsic_al2p_nv:
case nir_intrinsic_ald_nv:
is_divergent = true;
break;

13
src/compiler/nir/nir_intrinsics.py
View file

@ -1958,6 +1958,19 @@ system_value("ray_query_global_intel", 1, bit_sizes=[64])
# NVIDIA-specific intrinsics
intrinsic("load_sysval_nv", dest_comp=1, src_comp=[], bit_sizes=[32, 64],
indices=[ACCESS, BASE], flags=[CAN_ELIMINATE])
intrinsic("isberd_nv", dest_comp=1, src_comp=[1], bit_sizes=[32],
flags=[CAN_ELIMINATE, CAN_REORDER])
intrinsic("al2p_nv", dest_comp=1, src_comp=[1], bit_sizes=[32],
indices=[BASE, FLAGS], flags=[CAN_ELIMINATE, CAN_REORDER])
# src[] = { vtx, offset }.
# FLAGS is struct nak_nir_attr_io_flags
intrinsic("ald_nv", dest_comp=0, src_comp=[1, 1], bit_sizes=[32],
indices=[BASE, RANGE_BASE, RANGE, FLAGS, ACCESS],
flags=[CAN_ELIMINATE])
# src[] = { data, vtx, offset }.
# FLAGS is struct nak_nir_attr_io_flags
intrinsic("ast_nv", src_comp=[0, 1, 1],
indices=[BASE, RANGE_BASE, RANGE, FLAGS], flags=[])
# In order to deal with flipped render targets, gl_PointCoord may be flipped
# in the shader requiring a shader key or extra instructions or it may be