[Mesa-dev] [PATCH v2 2/2] radv: implement AMD_gcn_shader extension
Daniel Schürmann
daniel.schuermann at campus.tu-berlin.de
Wed Feb 21 20:03:46 UTC 2018
> On Wed, Feb 21, 2018 at 1:00 PM, <daniel.schuermann at campus.tu-berlin.de> wrote:
>> From: Dave Airlie <airlied at redhat.com>
>>
>> Co-authored-by: Daniel Schürmann <daniel.schuermann at campus.tu-berlin.de>
>> Signed-off-by: Daniel Schürmann <daniel.schuermann at campus.tu-berlin.de>
>> ---
>> src/amd/common/ac_llvm_build.c | 3 +-
>> src/amd/common/ac_nir_to_llvm.c | 39 ++++++++++++++++++++++
>> src/amd/vulkan/radv_extensions.py | 1 +
>> src/compiler/nir/meson.build | 1 +
>> src/compiler/nir/nir_intrinsics.h | 4 +++
>> src/compiler/spirv/spirv_to_nir.c | 2 ++
>> src/compiler/spirv/vtn_amd.c | 68 +++++++++++++++++++++++++++++++++++++++
>> src/compiler/spirv/vtn_private.h | 3 ++
>> 8 files changed, 120 insertions(+), 1 deletion(-)
>> create mode 100644 src/compiler/spirv/vtn_amd.c
>>
>> diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c
>> index 15144addb9..3bb74c2b0b 100644
>> --- a/src/amd/common/ac_llvm_build.c
>> +++ b/src/amd/common/ac_llvm_build.c
>> @@ -370,7 +370,8 @@ LLVMValueRef
>> ac_build_shader_clock(struct ac_llvm_context *ctx)
>> {
>> LLVMValueRef tmp = ac_build_intrinsic(ctx, "llvm.readcyclecounter",
>> - ctx->i64, NULL, 0, 0);
>> + ctx->i64, NULL, 0, AC_FUNC_ATTR_READONLY);
>> + ac_build_optimization_barrier(ctx, &tmp);
> ac_build_optimization_barrier() creates an empty inline asm statement,
> which actually doesn't do much to prevent code motion beyond the
> attributes already added to llvm.readcyclecounter by llvm. It prevents
> duplicating it, but that's about it, and not useful anyways. We only
> use it to work around some problems with cross-wavefront intrinsics,
> which don't exist here. You can just drop this hunk.
It also prevents LLVM from eliminating multiple calls to the same function,
which is the purpose in this case. (And also functions as "kind of" code
motion barrier)
>
>> return LLVMBuildBitCast(ctx->builder, tmp, ctx->v2i32, "");
>> }
>>
>> diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
>> index 2460e105f7..05f28b26a2 100644
>> --- a/src/amd/common/ac_nir_to_llvm.c
>> +++ b/src/amd/common/ac_nir_to_llvm.c
>> @@ -4328,6 +4328,38 @@ load_patch_vertices_in(struct ac_shader_abi *abi)
>> return LLVMConstInt(ctx->ac.i32, ctx->options->key.tcs.input_vertices, false);
>> }
>>
>> +static LLVMValueRef
>> +visit_cube_face_index(struct ac_nir_context *ctx,
>> + nir_intrinsic_instr *instr)
>> +{
>> + LLVMValueRef result;
>> + LLVMValueRef in[3];
>> + LLVMValueRef src0 = ac_to_float(&ctx->ac, get_src(ctx, instr->src[0]));
>> + for (unsigned chan = 0; chan < 3; chan++)
>> + in[chan] = ac_llvm_extract_elem(&ctx->ac, src0, chan);
>> +
>> + result = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.cubeid",
>> + ctx->ac.f32, in, 3, AC_FUNC_ATTR_READNONE);
>> + return result;
>> +}
>> +
>> +static LLVMValueRef
>> +visit_cube_face_coord(struct ac_nir_context *ctx,
>> + nir_intrinsic_instr *instr)
>> +{
>> + LLVMValueRef results[2];
>> + LLVMValueRef in[3];
>> + LLVMValueRef src0 = ac_to_float(&ctx->ac, get_src(ctx, instr->src[0]));
>> + for (unsigned chan = 0; chan < 3; chan++)
>> + in[chan] = ac_llvm_extract_elem(&ctx->ac, src0, chan);
>> +
>> + results[0] = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.cubetc",
>> + ctx->ac.f32, in, 3, AC_FUNC_ATTR_READNONE);
>> + results[1] = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.cubesc",
>> + ctx->ac.f32, in, 3, AC_FUNC_ATTR_READNONE);
>> + return ac_build_gather_values(&ctx->ac, results, 2);
>> +}
>> +
>> static void visit_intrinsic(struct ac_nir_context *ctx,
>> nir_intrinsic_instr *instr)
>> {
>> @@ -4613,6 +4645,13 @@ static void visit_intrinsic(struct ac_nir_context *ctx,
>> result = LLVMBuildSExt(ctx->ac.builder, tmp, ctx->ac.i32, "");
>> break;
>> }
>> + case nir_intrinsic_cube_face_index:
>> + result = visit_cube_face_index(ctx, instr);
>> + break;
>> + case nir_intrinsic_cube_face_coord:
>> + result = visit_cube_face_coord(ctx, instr);
>> + break;
>> +
>> default:
>> fprintf(stderr, "Unknown intrinsic: ");
>> nir_print_instr(&instr->instr, stderr);
>> diff --git a/src/amd/vulkan/radv_extensions.py b/src/amd/vulkan/radv_extensions.py
>> index d761895d3a..a63e01faae 100644
>> --- a/src/amd/vulkan/radv_extensions.py
>> +++ b/src/amd/vulkan/radv_extensions.py
>> @@ -88,6 +88,7 @@ EXTENSIONS = [
>> Extension('VK_EXT_external_memory_host', 1, 'device->rad_info.has_userptr'),
>> Extension('VK_EXT_global_priority', 1, 'device->rad_info.has_ctx_priority'),
>> Extension('VK_AMD_draw_indirect_count', 1, True),
>> + Extension('VK_AMD_gcn_shader', 1, True),
>> Extension('VK_AMD_rasterization_order', 1, 'device->rad_info.chip_class >= VI && device->rad_info.max_se >= 2'),
>> Extension('VK_AMD_shader_info', 1, True),
>> ]
>> diff --git a/src/compiler/nir/meson.build b/src/compiler/nir/meson.build
>> index 859a0c1e62..e0011a4dc0 100644
>> --- a/src/compiler/nir/meson.build
>> +++ b/src/compiler/nir/meson.build
>> @@ -189,6 +189,7 @@ files_libnir = files(
>> '../spirv/spirv_info.h',
>> '../spirv/spirv_to_nir.c',
>> '../spirv/vtn_alu.c',
>> + '../spirv/vtn_amd.c',
>> '../spirv/vtn_cfg.c',
>> '../spirv/vtn_glsl450.c',
>> '../spirv/vtn_private.h',
>> diff --git a/src/compiler/nir/nir_intrinsics.h b/src/compiler/nir/nir_intrinsics.h
>> index ede2927787..aefb8a3626 100644
>> --- a/src/compiler/nir/nir_intrinsics.h
>> +++ b/src/compiler/nir/nir_intrinsics.h
>> @@ -318,6 +318,10 @@ INTRINSIC(shared_atomic_xor, 2, ARR(1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
>> INTRINSIC(shared_atomic_exchange, 2, ARR(1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
>> INTRINSIC(shared_atomic_comp_swap, 3, ARR(1, 1, 1), true, 1, 0, 1, BASE, xx, xx, 0)
>>
>> +/* AMD_gcn_shader intrinsics */
>> +INTRINSIC(cube_face_coord, 1, ARR(3), true, 2, 0, 0, xx, xx, xx, 0)
>> +INTRINSIC(cube_face_index, 1, ARR(3), true, 1, 0, 0, xx, xx, xx, 0)
>> +
>> /* Used by nir_builder.h to generate loader helpers for the system values. */
>> #ifndef DEFINE_SYSTEM_VALUE
>> #define DEFINE_SYSTEM_VALUE(name)
>> diff --git a/src/compiler/spirv/spirv_to_nir.c b/src/compiler/spirv/spirv_to_nir.c
>> index c6df764682..40a52da13b 100644
>> --- a/src/compiler/spirv/spirv_to_nir.c
>> +++ b/src/compiler/spirv/spirv_to_nir.c
>> @@ -373,6 +373,8 @@ vtn_handle_extension(struct vtn_builder *b, SpvOp opcode,
>> struct vtn_value *val = vtn_push_value(b, w[1], vtn_value_type_extension);
>> if (strcmp((const char *)&w[2], "GLSL.std.450") == 0) {
>> val->ext_handler = vtn_handle_glsl450_instruction;
>> + } else if (strcmp((const char *)&w[2], "SPV_AMD_gcn_shader") == 0) {
>> + val->ext_handler = vtn_handle_amd_gcn_shader_instruction;
>> } else {
>> vtn_fail("Unsupported extension");
>> }
>> diff --git a/src/compiler/spirv/vtn_amd.c b/src/compiler/spirv/vtn_amd.c
>> new file mode 100644
>> index 0000000000..82a90ff269
>> --- /dev/null
>> +++ b/src/compiler/spirv/vtn_amd.c
>> @@ -0,0 +1,68 @@
>> +/*
>> + * Copyright © 2017 Valve Corporation
>> + * Copyright © 2017 Red Hat
>> + *
>> + * Permission is hereby granted, free of charge, to any person obtaining a
>> + * copy of this software and associated documentation files (the "Software"),
>> + * to deal in the Software without restriction, including without limitation
>> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
>> + * and/or sell copies of the Software, and to permit persons to whom the
>> + * Software is furnished to do so, subject to the following conditions:
>> + *
>> + * The above copyright notice and this permission notice (including the next
>> + * paragraph) shall be included in all copies or substantial portions of the
>> + * Software.
>> + *
>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
>> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
>> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
>> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
>> + * IN THE SOFTWARE.
>> + *
>> + */
>> +
>> +#include "vtn_private.h"
>> +#include "GLSL.ext.AMD.h"
>> +
>> +bool
>> +vtn_handle_amd_gcn_shader_instruction(struct vtn_builder *b, uint32_t ext_opcode,
>> + const uint32_t *w, unsigned count)
>> +{
>> + nir_intrinsic_op op;
>> + const struct glsl_type *dest_type =
>> + vtn_value(b, w[1], vtn_value_type_type)->type->type;
>> +
>> + switch ((enum GcnShaderAMD)ext_opcode) {
>> + case CubeFaceIndexAMD:
>> + op = nir_intrinsic_cube_face_index;
>> + break;
>> + case CubeFaceCoordAMD:
>> + op = nir_intrinsic_cube_face_coord;
>> + break;
>> + case TimeAMD:
>> + op = nir_intrinsic_shader_clock;
>> + break;
>> + default:
>> + unreachable("Invalid opcode");
>> + }
>> +
>> + struct vtn_value *val = vtn_push_value(b, w[2], vtn_value_type_ssa);
>> + nir_intrinsic_instr *intrin = nir_intrinsic_instr_create(b->nb.shader, op);
>> +
>> + if (ext_opcode != TimeAMD) {
>> + intrin->src[0] = nir_src_for_ssa(vtn_ssa_value(b, w[5])->def);
>> + nir_ssa_dest_init(&intrin->instr, &intrin->dest, glsl_get_vector_elements(dest_type),
>> + glsl_get_bit_size(dest_type), NULL);
>> + nir_builder_instr_insert(&b->nb, &intrin->instr);
>> + val->ssa = vtn_create_ssa_value(b, dest_type);
>> + val->ssa->def = &intrin->dest.ssa;
>> + } else {
>> + nir_ssa_dest_init(&intrin->instr, &intrin->dest, 2, 32, NULL);
>> + nir_builder_instr_insert(&b->nb, &intrin->instr);
>> + val->ssa = vtn_create_ssa_value(b, dest_type);
>> + val->ssa->def = nir_build_alu(&b->nb, nir_op_pack_64_2x32, &intrin->dest.ssa, NULL, NULL, NULL);
> You can use the autogenerated nir_pack_64_2x32() function here
> directly, rather than using nir_build_alu().
Thx
>
>> + }
>> + return true;
>> +}
>> diff --git a/src/compiler/spirv/vtn_private.h b/src/compiler/spirv/vtn_private.h
>> index 3e49df4dac..a703d45b18 100644
>> --- a/src/compiler/spirv/vtn_private.h
>> +++ b/src/compiler/spirv/vtn_private.h
>> @@ -723,4 +723,7 @@ vtn_u64_literal(const uint32_t *w)
>> return (uint64_t)w[1] << 32 | w[0];
>> }
>>
>> +bool vtn_handle_amd_gcn_shader_instruction(struct vtn_builder *b, uint32_t ext_opcode,
>> + const uint32_t *words, unsigned count);
>> +
>> #endif /* _VTN_PRIVATE_H_ */
>> --
>> 2.14.1
>>
More information about the mesa-dev
mailing list