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llvm-project/clang/test/CodeGenSYCL/address-space-conversions.cpp
schittir fdfcebb38d
[clang][SYCL] Add sycl_external attribute and restrict emitting device code (#140282) 
This patch is part of the upstreaming effort for supporting SYCL
language front end.
It makes the following changes:
1. Adds sycl_external attribute for functions with external linkage,
which is intended for use to implement the SYCL_EXTERNAL macro as
specified by the SYCL 2020 specification
2. Adds checks to avoid emitting device code when sycl_external and
sycl_kernel_entry_point attributes are not enabled
3. Fixes test failures caused by the above changes

This patch is missing diagnostics for the following diagnostics listed
in the SYCL 2020 specification's section 5.10.1, which will be addressed
in a subsequent PR:
Functions that are declared using SYCL_EXTERNAL have the following
additional restrictions beyond those imposed on other device functions:
1. If the SYCL backend does not support the generic address space then
the function cannot use raw pointers as parameter or return types.
Explicit pointer classes must be used instead;
2. The function cannot call group::parallel_for_work_item;
3. The function cannot be called from a parallel_for_work_group scope.

In addition to that, the subsequent PR will also implement diagnostics
for inline functions including virtual functions defined as inline.

---------

Co-authored-by: Mariya Podchishchaeva <mariya.podchishchaeva@intel.com>
2025-08-20 12:37:37 -04:00

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// RUN: %clang_cc1 -triple spir64 -fsycl-is-device -disable-llvm-passes -emit-llvm %s -o - | FileCheck %s
void bar(int &Data) {}
// CHECK-DAG: define{{.*}} spir_func void @[[RAW_REF:[a-zA-Z0-9_]+]](ptr addrspace(4) noundef align 4 dereferenceable(4) %
void bar2(int &Data) {}
// CHECK-DAG: define{{.*}} spir_func void @[[RAW_REF2:[a-zA-Z0-9_]+]](ptr addrspace(4) noundef align 4 dereferenceable(4) %
void bar(__attribute__((opencl_local)) int &Data) {}
// CHECK-DAG: define{{.*}} spir_func void [[LOC_REF:@[a-zA-Z0-9_]+]](ptr addrspace(3) noundef align 4 dereferenceable(4) %
void foo(int *Data) {}
// CHECK-DAG: define{{.*}} spir_func void @[[RAW_PTR:[a-zA-Z0-9_]+]](ptr addrspace(4) noundef %
void foo2(int *Data) {}
// CHECK-DAG: define{{.*}} spir_func void @[[RAW_PTR2:[a-zA-Z0-9_]+]](ptr addrspace(4) noundef %
void foo(__attribute__((opencl_local)) int *Data) {}
// CHECK-DAG: define{{.*}} spir_func void [[LOC_PTR:@[a-zA-Z0-9_]+]](ptr addrspace(3) noundef %
template <typename T>
void tmpl(T t) {}
// See Check Lines below.
[[clang::sycl_external]] void usages() {
int *NoAS;
// CHECK-DAG: [[NoAS:%[a-zA-Z0-9]+]] = alloca ptr addrspace(4)
__attribute__((opencl_global)) int *GLOB;
// CHECK-DAG: [[GLOB:%[a-zA-Z0-9]+]] = alloca ptr addrspace(1)
__attribute__((opencl_local)) int *LOC;
// CHECK-DAG: [[LOC:%[a-zA-Z0-9]+]] = alloca ptr addrspace(3)
__attribute__((opencl_private)) int *PRIV;
// CHECK-DAG: [[PRIV:%[a-zA-Z0-9]+]] = alloca ptr
__attribute__((opencl_global_device)) int *GLOBDEVICE;
// CHECK-DAG: [[GLOB_DEVICE:%[a-zA-Z0-9]+]] = alloca ptr addrspace(5)
__attribute__((opencl_global_host)) int *GLOBHOST;
// CHECK-DAG: [[GLOB_HOST:%[a-zA-Z0-9]+]] = alloca ptr addrspace(6)
// CHECK-DAG: [[NoAS]].ascast = addrspacecast ptr [[NoAS]] to ptr addrspace(4)
// CHECK-DAG: [[GLOB]].ascast = addrspacecast ptr [[GLOB]] to ptr addrspace(4)
// CHECK-DAG: [[LOC]].ascast = addrspacecast ptr [[LOC]] to ptr addrspace(4)
// CHECK-DAG: [[PRIV]].ascast = addrspacecast ptr [[PRIV]] to ptr addrspace(4)
LOC = nullptr;
// CHECK-DAG: store ptr addrspace(3) null, ptr addrspace(4) [[LOC]].ascast, align 8
GLOB = nullptr;
// CHECK-DAG: store ptr addrspace(1) null, ptr addrspace(4) [[GLOB]].ascast, align 8
// Explicit conversions
// From named address spaces to default address space
// CHECK-DAG: [[GLOB_LOAD:%[a-zA-Z0-9]+]] = load ptr addrspace(1), ptr addrspace(4) [[GLOB]].ascast
// CHECK-DAG: [[GLOB_CAST:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(1) [[GLOB_LOAD]] to ptr addrspace(4)
// CHECK-DAG: store ptr addrspace(4) [[GLOB_CAST]], ptr addrspace(4) [[NoAS]].ascast
NoAS = (int *)GLOB;
// CHECK-DAG: [[LOC_LOAD:%[a-zA-Z0-9]+]] = load ptr addrspace(3), ptr addrspace(4) [[LOC]].ascast
// CHECK-DAG: [[LOC_CAST:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(3) [[LOC_LOAD]] to ptr addrspace(4)
// CHECK-DAG: store ptr addrspace(4) [[LOC_CAST]], ptr addrspace(4) [[NoAS]].ascast
NoAS = (int *)LOC;
// CHECK-DAG: [[PRIV_LOAD:%[a-zA-Z0-9]+]] = load ptr, ptr addrspace(4) [[PRIV]].ascast
// CHECK-DAG: [[PRIV_CAST:%[a-zA-Z0-9]+]] = addrspacecast ptr [[PRIV_LOAD]] to ptr addrspace(4)
// CHECK-DAG: store ptr addrspace(4) [[PRIV_CAST]], ptr addrspace(4) [[NoAS]].ascast
NoAS = (int *)PRIV;
// From default address space to named address space
// CHECK-DAG: [[NoAS_LOAD:%[a-zA-Z0-9]+]] = load ptr addrspace(4), ptr addrspace(4) [[NoAS]].ascast
// CHECK-DAG: [[NoAS_CAST:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(4) [[NoAS_LOAD]] to ptr addrspace(1)
// CHECK-DAG: store ptr addrspace(1) [[NoAS_CAST]], ptr addrspace(4) [[GLOB]].ascast
GLOB = (__attribute__((opencl_global)) int *)NoAS;
// CHECK-DAG: [[NoAS_LOAD:%[a-zA-Z0-9]+]] = load ptr addrspace(4), ptr addrspace(4) [[NoAS]].ascast
// CHECK-DAG: [[NoAS_CAST:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(4) [[NoAS_LOAD]] to ptr addrspace(3)
// CHECK-DAG: store ptr addrspace(3) [[NoAS_CAST]], ptr addrspace(4) [[LOC]].ascast
LOC = (__attribute__((opencl_local)) int *)NoAS;
// CHECK-DAG: [[NoAS_LOAD:%[a-zA-Z0-9]+]] = load ptr addrspace(4), ptr addrspace(4) [[NoAS]].ascast
// CHECK-DAG: [[NoAS_CAST:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(4) [[NoAS_LOAD]] to ptr
// CHECK-DAG: store ptr [[NoAS_CAST]], ptr addrspace(4) [[PRIV]].ascast
PRIV = (__attribute__((opencl_private)) int *)NoAS;
// From opencl_global_[host/device] address spaces to opencl_global
// CHECK-DAG: [[GLOBDEVICE_LOAD:%[a-zA-Z0-9]+]] = load ptr addrspace(5), ptr addrspace(4) [[GLOB_DEVICE]].ascast
// CHECK-DAG: [[GLOBDEVICE_CAST:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(5) [[GLOBDEVICE_LOAD]] to ptr addrspace(1)
// CHECK-DAG: store ptr addrspace(1) [[GLOBDEVICE_CAST]], ptr addrspace(4) [[GLOB]].ascast
GLOB = (__attribute__((opencl_global)) int *)GLOBDEVICE;
// CHECK-DAG: [[GLOBHOST_LOAD:%[a-zA-Z0-9]+]] = load ptr addrspace(6), ptr addrspace(4) [[GLOB_HOST]].ascast
// CHECK-DAG: [[GLOBHOST_CAST:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(6) [[GLOBHOST_LOAD]] to ptr addrspace(1)
// CHECK-DAG: store ptr addrspace(1) [[GLOBHOST_CAST]], ptr addrspace(4) [[GLOB]].ascast
GLOB = (__attribute__((opencl_global)) int *)GLOBHOST;
bar(*GLOB);
// CHECK-DAG: [[GLOB_LOAD:%[a-zA-Z0-9]+]] = load ptr addrspace(1), ptr addrspace(4) [[GLOB]].ascast
// CHECK-DAG: [[GLOB_CAST:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(1) [[GLOB_LOAD]] to ptr addrspace(4)
// CHECK-DAG: call spir_func void @[[RAW_REF]](ptr addrspace(4) noundef align 4 dereferenceable(4) [[GLOB_CAST]])
bar2(*GLOB);
// CHECK-DAG: [[GLOB_LOAD2:%[a-zA-Z0-9]+]] = load ptr addrspace(1), ptr addrspace(4) [[GLOB]].ascast
// CHECK-DAG: [[GLOB_CAST2:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(1) [[GLOB_LOAD2]] to ptr addrspace(4)
// CHECK-DAG: call spir_func void @[[RAW_REF2]](ptr addrspace(4) noundef align 4 dereferenceable(4) [[GLOB_CAST2]])
bar(*LOC);
// CHECK-DAG: [[LOC_LOAD:%[a-zA-Z0-9]+]] = load ptr addrspace(3), ptr addrspace(4) [[LOC]].ascast
// CHECK-DAG: call spir_func void [[LOC_REF]](ptr addrspace(3) noundef align 4 dereferenceable(4) [[LOC_LOAD]])
bar2(*LOC);
// CHECK-DAG: [[LOC_LOAD2:%[a-zA-Z0-9]+]] = load ptr addrspace(3), ptr addrspace(4) [[LOC]].ascast
// CHECK-DAG: [[LOC_CAST2:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(3) [[LOC_LOAD2]] to ptr addrspace(4)
// CHECK-DAG: call spir_func void @[[RAW_REF2]](ptr addrspace(4) noundef align 4 dereferenceable(4) [[LOC_CAST2]])
bar(*NoAS);
// CHECK-DAG: [[NoAS_LOAD:%[a-zA-Z0-9]+]] = load ptr addrspace(4), ptr addrspace(4) [[NoAS]].ascast
// CHECK-DAG: call spir_func void @[[RAW_REF]](ptr addrspace(4) noundef align 4 dereferenceable(4) [[NoAS_LOAD]])
bar2(*NoAS);
// CHECK-DAG: [[NoAS_LOAD2:%[a-zA-Z0-9]+]] = load ptr addrspace(4), ptr addrspace(4) [[NoAS]].ascast
// CHECK-DAG: call spir_func void @[[RAW_REF2]](ptr addrspace(4) noundef align 4 dereferenceable(4) [[NoAS_LOAD2]])
foo(GLOB);
// CHECK-DAG: [[GLOB_LOAD3:%[a-zA-Z0-9]+]] = load ptr addrspace(1), ptr addrspace(4) [[GLOB]].ascast
// CHECK-DAG: [[GLOB_CAST3:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(1) [[GLOB_LOAD3]] to ptr addrspace(4)
// CHECK-DAG: call spir_func void @[[RAW_PTR]](ptr addrspace(4) noundef [[GLOB_CAST3]])
foo2(GLOB);
// CHECK-DAG: [[GLOB_LOAD4:%[a-zA-Z0-9]+]] = load ptr addrspace(1), ptr addrspace(4) [[GLOB]].ascast
// CHECK-DAG: [[GLOB_CAST4:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(1) [[GLOB_LOAD4]] to ptr addrspace(4)
// CHECK-DAG: call spir_func void @[[RAW_PTR2]](ptr addrspace(4) noundef [[GLOB_CAST4]])
foo(LOC);
// CHECK-DAG: [[LOC_LOAD3:%[a-zA-Z0-9]+]] = load ptr addrspace(3), ptr addrspace(4) [[LOC]].ascast
// CHECK-DAG: call spir_func void [[LOC_PTR]](ptr addrspace(3) noundef [[LOC_LOAD3]])
foo2(LOC);
// CHECK-DAG: [[LOC_LOAD4:%[a-zA-Z0-9]+]] = load ptr addrspace(3), ptr addrspace(4) [[LOC]].ascast
// CHECK-DAG: [[LOC_CAST4:%[a-zA-Z0-9]+]] = addrspacecast ptr addrspace(3) [[LOC_LOAD4]] to ptr addrspace(4)
// CHECK-DAG: call spir_func void @[[RAW_PTR2]](ptr addrspace(4) noundef [[LOC_CAST4]])
foo(NoAS);
// CHECK-DAG: [[NoAS_LOAD3:%[a-zA-Z0-9]+]] = load ptr addrspace(4), ptr addrspace(4) [[NoAS]].ascast
// CHECK-DAG: call spir_func void @[[RAW_PTR]](ptr addrspace(4) noundef [[NoAS_LOAD3]])
foo2(NoAS);
// CHECK-DAG: [[NoAS_LOAD4:%[a-zA-Z0-9]+]] = load ptr addrspace(4), ptr addrspace(4) [[NoAS]].ascast
// CHECK-DAG: call spir_func void @[[RAW_PTR2]](ptr addrspace(4) noundef [[NoAS_LOAD4]])
// Ensure that we still get 3 different template instantiations.
tmpl(GLOB);
// CHECK-DAG: [[GLOB_LOAD4:%[a-zA-Z0-9]+]] = load ptr addrspace(1), ptr addrspace(4) [[GLOB]].ascast
// CHECK-DAG: call spir_func void @_Z4tmplIPU3AS1iEvT_(ptr addrspace(1) noundef [[GLOB_LOAD4]])
tmpl(LOC);
// CHECK-DAG: [[LOC_LOAD5:%[a-zA-Z0-9]+]] = load ptr addrspace(3), ptr addrspace(4) [[LOC]].ascast
// CHECK-DAG: call spir_func void @_Z4tmplIPU3AS3iEvT_(ptr addrspace(3) noundef [[LOC_LOAD5]])
tmpl(PRIV);
// CHECK-DAG: [[PRIV_LOAD5:%[a-zA-Z0-9]+]] = load ptr, ptr addrspace(4) [[PRIV]].ascast
// CHECK-DAG: call spir_func void @_Z4tmplIPU3AS0iEvT_(ptr noundef [[PRIV_LOAD5]])
tmpl(NoAS);
// CHECK-DAG: [[NoAS_LOAD5:%[a-zA-Z0-9]+]] = load ptr addrspace(4), ptr addrspace(4) [[NoAS]].ascast
// CHECK-DAG: call spir_func void @_Z4tmplIPiEvT_(ptr addrspace(4) noundef [[NoAS_LOAD5]])
}
// CHECK-DAG: define linkonce_odr spir_func void @_Z4tmplIPU3AS1iEvT_(ptr addrspace(1) noundef %
// CHECK-DAG: define linkonce_odr spir_func void @_Z4tmplIPU3AS3iEvT_(ptr addrspace(3) noundef %
// CHECK-DAG: define linkonce_odr spir_func void @_Z4tmplIPU3AS0iEvT_(ptr noundef %
// CHECK-DAG: define linkonce_odr spir_func void @_Z4tmplIPiEvT_(ptr addrspace(4) noundef %
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