33a6ce1837
`-fgpu-rdc` mode allows device functions call device functions in
different TU. However, currently all device objects have to be linked
together since only one fat binary is supported. This is time consuming
for AMDGPU backend since it only supports LTO.
There are use cases that objects can be divided into groups in which
device functions are self-contained but host functions are not. It is
desirable to link/optimize/codegen the device code and generate a fatbin
for each group, whereas partially link the host code with `ld -r` or
generate a static library by using the `--emit-static-lib` option of
clang. This avoids linking all device code together, therefore decreases
the linking time for `-fgpu-rdc`.
Previously, clang emits an external symbol `__hip_fatbin` for all
objects for `-fgpu-rdc`. With this patch, clang emits an unique external
symbol `__hip_fatbin_{cuid}` for the fat binary for each object. When a
group of objects are linked together to generate a fatbin, the symbols
are merged by alias and point to the same fat binary. Each group has its
own fat binary. One executable or shared library can have multiple fat
binaries. Device linking is done for undefined fab binary symbols only
to avoid repeated linking. `__hip_gpubin_handle` is also uniquefied and
merged to avoid repeated registering. Symbol `__hip_cuid_{cuid}` is
introduced to facilitate debugging and tooling.
Fixes: https://github.com/llvm/llvm-project/issues/77018
296 lines
14 KiB
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296 lines
14 KiB
Plaintext
// RUN: echo -n "GPU binary would be here." > %t
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s \
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// RUN: -target-sdk-version=8.0 -fcuda-include-gpubinary %t -o - \
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// RUN: | FileCheck -allow-deprecated-dag-overlap %s \
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// RUN: --check-prefixes=ALL,LNX,NORDC,CUDA,CUDANORDC,CUDA-OLD
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s \
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// RUN: -target-sdk-version=8.0 -fcuda-include-gpubinary %t \
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// RUN: -o - -DNOGLOBALS \
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// RUN: | FileCheck -allow-deprecated-dag-overlap %s \
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// RUN: -check-prefixes=NOGLOBALS,CUDANOGLOBALS
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s \
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// RUN: -target-sdk-version=8.0 -fgpu-rdc -fcuda-include-gpubinary %t \
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// RUN: -o - \
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// RUN: | FileCheck -allow-deprecated-dag-overlap %s \
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// RUN: --check-prefixes=ALL,LNX,RDC,CUDA,CUDARDC,CUDA-OLD
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s \
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// RUN: -target-sdk-version=8.0 -o - \
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// RUN: | FileCheck -allow-deprecated-dag-overlap %s -check-prefix=NOGPUBIN
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s \
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// RUN: -target-sdk-version=9.2 -fcuda-include-gpubinary %t -o - \
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// RUN: | FileCheck %s -allow-deprecated-dag-overlap \
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// RUN: --check-prefixes=ALL,LNX,NORDC,CUDA,CUDANORDC,CUDA-NEW
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s \
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// RUN: -target-sdk-version=9.2 -fcuda-include-gpubinary %t -o - -DNOGLOBALS \
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// RUN: | FileCheck -allow-deprecated-dag-overlap %s \
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// RUN: --check-prefixes=NOGLOBALS,CUDANOGLOBALS
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s \
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// RUN: -target-sdk-version=9.2 -fgpu-rdc -fcuda-include-gpubinary %t -o - \
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// RUN: | FileCheck %s -allow-deprecated-dag-overlap \
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// RUN: --check-prefixes=ALL,LNX,RDC,CUDA,CUDARDC,CUDA-NEW
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s -std=c++17 \
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// RUN: -target-sdk-version=9.2 -fcuda-include-gpubinary %t -o - \
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// RUN: | FileCheck %s -allow-deprecated-dag-overlap \
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// RUN: --check-prefixes=ALL,LNX,NORDC,CUDA,CUDANORDC,CUDA-NEW,LNX_17,NORDC17
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s -std=c++17 \
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// RUN: -target-sdk-version=9.2 -fgpu-rdc -fcuda-include-gpubinary %t -o - \
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// RUN: | FileCheck %s -allow-deprecated-dag-overlap \
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// RUN: --check-prefixes=ALL,LNX,RDC,CUDA,CUDARDC,CUDA-NEW,LNX_17,RDC17
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s \
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// RUN: -target-sdk-version=9.2 -o - \
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// RUN: | FileCheck -allow-deprecated-dag-overlap %s -check-prefix=NOGPUBIN
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s \
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// RUN: -fcuda-include-gpubinary %t -o - -x hip\
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// RUN: | FileCheck -allow-deprecated-dag-overlap %s --check-prefixes=ALL,LNX,NORDC,HIP,HIPEF
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s \
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// RUN: -fcuda-include-gpubinary %t -o - -DNOGLOBALS -x hip \
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// RUN: | FileCheck -allow-deprecated-dag-overlap %s -check-prefixes=NOGLOBALS,HIPNOGLOBALS
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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s \
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// RUN: -fgpu-rdc -fcuda-include-gpubinary %t -o - -x hip \
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// RUN: | FileCheck -allow-deprecated-dag-overlap %s --check-prefixes=ALL,LNX,RDC,HIP,HIPEF
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// RUN: %clang_cc1 -cuid=123 -triple x86_64-linux-gnu -emit-llvm %s -o - -x hip\
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// RUN: | FileCheck -allow-deprecated-dag-overlap %s -check-prefixes=ALL,LNX,NORDC,HIP,HIPNEF
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// RUN: %clang_cc1 -triple x86_64-pc-windows-msvc -aux-triple amdgcn -emit-llvm %s \
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// RUN: -fcuda-include-gpubinary %t -o - -x hip\
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// RUN: | FileCheck -allow-deprecated-dag-overlap %s --check-prefixes=ALL,WIN
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// RUN: %clang_cc1 -cuid=123 -triple x86_64-pc-windows-msvc -aux-triple amdgcn -emit-llvm %s \
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// RUN: -o - -x hip\
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// RUN: | FileCheck -allow-deprecated-dag-overlap %s --check-prefixes=ALL,WIN,HIP,HIPNEF
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#include "Inputs/cuda.h"
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#ifndef NOGLOBALS
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// NORDC-DAG: @device_var = internal global i32
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// RDC-DAG: @device_var = global i32
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// WIN-DAG: @"?device_var@@3HA" = internal global i32
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__device__ int device_var;
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// NORDC-DAG: @constant_var = internal global i32
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// RDC-DAG: @constant_var = global i32
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// WIN-DAG: @"?constant_var@@3HA" = internal global i32
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__constant__ int constant_var;
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// NORDC-DAG: @shared_var = internal global i32
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// RDC-DAG: @shared_var = global i32
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// WIN-DAG: @"?shared_var@@3HA" = internal global i32
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__shared__ int shared_var;
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// Make sure host globals don't get internalized...
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// LNX-DAG: @host_var ={{.*}} global i32
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// WIN-DAG: @"?host_var@@3HA" = dso_local global i32
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int host_var;
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// ... and that extern vars remain external.
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// LNX-DAG: @ext_host_var = external global i32
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// WIN-DAG: @"?ext_host_var@@3HA" = external dso_local global i32
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extern int ext_host_var;
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// external device-side variables -> extern references to their shadows.
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// LNX-DAG: @ext_device_var = external global i32
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// WIN-DAG: @"?ext_device_var@@3HA" = external dso_local global i32
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extern __device__ int ext_device_var;
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// LNX-DAG: @ext_device_var = external global i32
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// WIN-DAG: @"?ext_constant_var@@3HA" = external dso_local global i32
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extern __constant__ int ext_constant_var;
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// external device-side variables with definitions should generate
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// definitions for the shadows.
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// NORDC-DAG: @ext_device_var_def = internal global i32 undef,
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// RDC-DAG: @ext_device_var_def = global i32 undef,
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// WIN-DAG: @"?ext_device_var_def@@3HA" = internal global i32 undef
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extern __device__ int ext_device_var_def;
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__device__ int ext_device_var_def = 1;
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// NORDC-DAG: @ext_device_var_def = internal global i32 undef,
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// RDC-DAG: @ext_device_var_def = global i32 undef,
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// WIN-DAG: @"?ext_constant_var_def@@3HA" = internal global i32 undef
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__constant__ int ext_constant_var_def = 2;
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#if __cplusplus > 201402L
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// NORDC17: @inline_var = internal global i32 undef, comdat, align 4{{$}}
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// RDC17: @inline_var = linkonce_odr global i32 undef, comdat, align 4{{$}}
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// NORDC17-NOT: @inline_var2 =
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// RDC17-NOT: @inline_var2 =
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// NORDC17: @_ZN1C17member_inline_varE = internal constant i32 undef, comdat, align 4{{$}}
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// RDC17: @_ZN1C17member_inline_varE = linkonce_odr constant i32 undef, comdat, align 4{{$}}
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// Check inline variable ODR-used by host is emitted on host and registered.
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__device__ inline int inline_var = 3;
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// Check inline variable not ODR-used by host is not emitted on host or registered.
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__device__ inline int inline_var2 = 5;
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struct C {
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__device__ static constexpr int member_inline_var = 4;
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};
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#endif
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void use_pointers() {
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const int *p;
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p = &device_var;
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p = &constant_var;
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p = &shared_var;
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p = &host_var;
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p = &ext_device_var;
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p = &ext_constant_var;
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p = &ext_host_var;
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#if __cplusplus > 201402L
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p = &inline_var;
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decltype(inline_var2) tmp;
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p = &C::member_inline_var;
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#endif
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}
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__device__ void device_use() {
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#if __cplusplus > 201402L
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const int *p = &inline_var2;
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#endif
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}
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// Make sure that all parts of GPU code init/cleanup are there:
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// * constant unnamed string with the device-side kernel name to be passed to
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// __hipRegisterFunction/__cudaRegisterFunction.
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// ALL: @0 = private unnamed_addr constant [18 x i8] c"_Z10kernelfunciii\00"
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// * constant unnamed string with the device-side kernel name to be passed to
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// __hipRegisterVar/__cudaRegisterVar.
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// ALL: @1 = private unnamed_addr constant [11 x i8] c"device_var\00"
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// ALL: @2 = private unnamed_addr constant [13 x i8] c"constant_var\00"
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// ALL: @3 = private unnamed_addr constant [19 x i8] c"ext_device_var_def\00"
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// ALL: @4 = private unnamed_addr constant [21 x i8] c"ext_constant_var_def\00"
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// * constant unnamed string with GPU binary
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// CUDA: @[[FATBIN:.*]] = private constant{{.*}} c"GPU binary would be here.",
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// HIPEF: @[[FATBIN:.*]] = private constant{{.*}} c"GPU binary would be here.",{{.*}}align 4096
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// HIPNEF: @[[FATBIN:__hip_fatbin_[0-9a-f]+]] = external constant i8, section ".hip_fatbin"
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// CUDANORDC-SAME: section ".nv_fatbin", align 8
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// CUDARDC-SAME: section "__nv_relfatbin", align 8
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// * constant struct that wraps GPU binary
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// ALL: @__[[PREFIX:cuda|hip]]_fatbin_wrapper = internal constant
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// LNX-SAME: { i32, i32, ptr, ptr }
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// CUDA-SAME: { i32 1180844977, i32 1,
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// HIP-SAME: { i32 1212764230, i32 1,
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// CUDA-SAME: ptr @[[FATBIN]],
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// HIPEF-SAME: ptr @[[FATBIN]],
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// HIPNEF-SAME: ptr @[[FATBIN]],
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// LNX-SAME: ptr null }
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// CUDA-SAME: section ".nvFatBinSegment"
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// HIP-SAME: section ".hipFatBinSegment"
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// * variable to save GPU binary handle after initialization
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// CUDANORDC: @__[[PREFIX]]_gpubin_handle = internal global ptr null
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// HIPNEF: @__[[PREFIX]]_gpubin_handle_{{[0-9a-f]+}} = external hidden global ptr, align 8
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// * constant unnamed string with NVModuleID
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// CUDARDC: [[MODULE_ID_GLOBAL:@.*]] = private constant
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// CUDARDC-SAME: c"[[MODULE_ID:.+]]\00", section "__nv_module_id", align 32
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// * Make sure our constructor was added to global ctor list.
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// LNX: @llvm.global_ctors = appending global {{.*}}@__[[PREFIX]]_module_ctor
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// * Alias to global symbol containing the NVModuleID.
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// CUDARDC: @__fatbinwrap[[MODULE_ID]] ={{.*}} alias { i32, i32, ptr, ptr }
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// CUDARDC-SAME: ptr @__[[PREFIX]]_fatbin_wrapper
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// Test that we build the correct number of calls to cudaSetupArgument followed
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// by a call to cudaLaunch.
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// LNX: define{{.*}}kernelfunc
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// New launch sequence stores arguments into local buffer and passes array of
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// pointers to them directly to cudaLaunchKernel
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// CUDA-NEW: alloca
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// CUDA-NEW: store
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// CUDA-NEW: store
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// CUDA-NEW: store
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// CUDA-NEW: call{{.*}}__cudaPopCallConfiguration
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// CUDA-NEW: call{{.*}}cudaLaunchKernel
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// Legacy style launch sequence sets up arguments by passing them to
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// [cuda|hip]SetupArgument.
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// CUDA-OLD: call{{.*}}[[PREFIX]]SetupArgument
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// CUDA-OLD: call{{.*}}[[PREFIX]]SetupArgument
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// CUDA-OLD: call{{.*}}[[PREFIX]]SetupArgument
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// CUDA-OLD: call{{.*}}[[PREFIX]]Launch
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// HIP: call{{.*}}[[PREFIX]]SetupArgument
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// HIP: call{{.*}}[[PREFIX]]SetupArgument
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// HIP: call{{.*}}[[PREFIX]]SetupArgument
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// HIP: call{{.*}}[[PREFIX]]Launch
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__global__ void kernelfunc(int i, int j, int k) {}
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// Test that we've built correct kernel launch sequence.
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// LNX: define{{.*}}hostfunc
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// CUDA-OLD: call{{.*}}[[PREFIX]]ConfigureCall
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// CUDA-NEW: call{{.*}}__cudaPushCallConfiguration
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// HIP: call{{.*}}[[PREFIX]]ConfigureCall
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// LNX: call{{.*}}kernelfunc
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void hostfunc(void) { kernelfunc<<<1, 1>>>(1, 1, 1); }
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#endif
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// Test that we've built a function to register kernels and global vars.
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// ALL: define internal void @__[[PREFIX]]_register_globals
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// ALL: call{{.*}}[[PREFIX]]RegisterFunction(ptr %0, {{.*}}kernelfunc{{[^,]*}}, {{[^@]*}}@0
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// ALL-DAG: call void {{.*}}[[PREFIX]]RegisterVar(ptr %0, {{.*}}device_var{{[^,]*}}, {{[^@]*}}@1, {{.*}}i32 0, {{i32|i64}} 4, i32 0, i32 0
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// ALL-DAG: call void {{.*}}[[PREFIX]]RegisterVar(ptr %0, {{.*}}constant_var{{[^,]*}}, {{[^@]*}}@2, {{.*}}i32 0, {{i32|i64}} 4, i32 1, i32 0
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// ALL-DAG: call void {{.*}}[[PREFIX]]RegisterVar(ptr %0, {{.*}}ext_device_var_def{{[^,]*}}, {{[^@]*}}@3, {{.*}}i32 0, {{i32|i64}} 4, i32 0, i32 0
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// ALL-DAG: call void {{.*}}[[PREFIX]]RegisterVar(ptr %0, {{.*}}ext_constant_var_def{{[^,]*}}, {{[^@]*}}@4, {{.*}}i32 0, {{i32|i64}} 4, i32 1, i32 0
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// LNX_17-DAG: [[PREFIX]]RegisterVar(ptr %0, {{.*}}inline_var
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// LNX_17-NOT: [[PREFIX]]RegisterVar(ptr %0, {{.*}}inline_var2
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// ALL: ret void
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// Test that we've built a constructor.
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// LNX: define internal void @__[[PREFIX]]_module_ctor
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// In separate mode it calls __[[PREFIX]]RegisterFatBinary(&__[[PREFIX]]_fatbin_wrapper)
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// HIP only register fat binary once.
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// HIP: load ptr, ptr @__hip_gpubin_handle
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// HIP-NEXT: icmp eq ptr {{.*}}, null
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// HIP-NEXT: br i1 {{.*}}, label %if, label %exit
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// HIP: if:
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// CUDANORDC: call{{.*}}[[PREFIX]]RegisterFatBinary{{.*}}__[[PREFIX]]_fatbin_wrapper
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// .. stores return value in __[[PREFIX]]_gpubin_handle
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// CUDANORDC-NEXT: store{{.*}}__[[PREFIX]]_gpubin_handle
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// .. and then calls __[[PREFIX]]_register_globals
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// HIP: call{{.*}}[[PREFIX]]RegisterFatBinary{{.*}}__[[PREFIX]]_fatbin_wrapper
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// .. stores return value in __[[PREFIX]]_gpubin_handle
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// HIP-NEXT: store{{.*}}__[[PREFIX]]_gpubin_handle
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// .. and then calls __[[PREFIX]]_register_globals
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// HIP-NEXT: br label %exit
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// HIP: exit:
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// HIP-NEXT: load ptr, ptr @__hip_gpubin_handle
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// CUDANORDC-NEXT: call void @__[[PREFIX]]_register_globals
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// HIP-NEXT: call void @__[[PREFIX]]_register_globals
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// * In separate mode we also register a destructor.
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// CUDANORDC-NEXT: call i32 @atexit(ptr @__[[PREFIX]]_module_dtor)
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// HIP-NEXT: call i32 @atexit(ptr @__[[PREFIX]]_module_dtor)
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// With relocatable device code we call __[[PREFIX]]RegisterLinkedBinary%NVModuleID%
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// CUDARDC: call{{.*}}__[[PREFIX]]RegisterLinkedBinary[[MODULE_ID]](
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// CUDARDC-SAME: __[[PREFIX]]_register_globals, {{.*}}__[[PREFIX]]_fatbin_wrapper
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// CUDARDC-SAME: [[MODULE_ID_GLOBAL]]
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// Test that we've created destructor.
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// CUDANORDC: define internal void @__[[PREFIX]]_module_dtor
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// HIP: define internal void @__[[PREFIX]]_module_dtor
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// CUDANORDC: load{{.*}}__[[PREFIX]]_gpubin_handle
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// HIP: load{{.*}}__[[PREFIX]]_gpubin_handle
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// CUDANORDC-NEXT: call void @__[[PREFIX]]UnregisterFatBinary
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// HIP-NEXT: icmp ne ptr {{.*}}, null
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// HIP-NEXT: br i1 {{.*}}, label %if, label %exit
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// HIP: if:
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// HIP-NEXT: call void @__[[PREFIX]]UnregisterFatBinary
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// HIP-NEXT: store ptr null, ptr @__hip_gpubin_handle
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// HIP-NEXT: br label %exit
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// HIP: exit:
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// There should be no __[[PREFIX]]_register_globals if we have no
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// device-side globals, but we still need to register GPU binary.
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// Skip GPU binary string first.
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// CUDANOGLOBALS-NOT: @{{.*}} = private constant{{.*}}
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// HIPNOGLOBALS-NOT: @{{.*}} = internal constant{{.*}}
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// NOGLOBALS-NOT: define internal void @__{{.*}}_register_globals
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// NOGLOBALS-NOT: define internal void @__{{cuda|hip}}_module_ctor
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// NOGLOBALS-NOT: call{{.*}}{{cuda|hip}}RegisterFatBinary{{.*}}__{{cuda|hip}}_fatbin_wrapper
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// NOGLOBALS-NOT: call void @__{{cuda|hip}}_register_globals
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// NOGLOBALS-NOT: define internal void @__{{cuda|hip}}_module_dtor
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// NOGLOBALS-NOT: call void @__{{cuda|hip}}UnregisterFatBinary
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// There should be no constructors/destructors if we have no GPU binary.
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// NOGPUBIN-NOT: define internal void @__{{cuda|hip}}_register_globals
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// NOGPUBIN-NOT: define internal void @__{{cuda|hip}}_module_ctor
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// NOGPUBIN-NOT: define internal void @__{{cuda|hip}}_module_dtor
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