This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG237c6924bd46: [OpenCL] Add clang extension for bit-fields.
(authored by Anastasia).
Herald added subscribers: foad, ldrumm.
Herald added a project: clang.
Changed prior to commit:
https://reviews.llvm.org/D101843?vs=344784&id=347348#toc
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D101843/new/
https://reviews.llvm.org/D101843
Files:
clang/docs/LanguageExtensions.rst
clang/include/clang/Basic/OpenCLExtensions.def
clang/lib/Basic/Targets/AMDGPU.h
clang/lib/Basic/Targets/NVPTX.h
clang/lib/Sema/SemaDecl.cpp
clang/test/Misc/amdgcn.languageOptsOpenCL.cl
clang/test/Misc/nvptx.languageOptsOpenCL.cl
clang/test/Misc/r600.languageOptsOpenCL.cl
clang/test/SemaOpenCL/unsupported.cl
Index: clang/test/SemaOpenCL/unsupported.cl
===================================================================
--- clang/test/SemaOpenCL/unsupported.cl
+++ clang/test/SemaOpenCL/unsupported.cl
@@ -1,7 +1,15 @@
// RUN: %clang_cc1 -verify %s
+// RUN: %clang_cc1 -verify %s -DBITFIELDS_EXT
-struct {
- int a : 1; // expected-error {{bit-fields are not supported in OpenCL}}
+#ifdef BITFIELDS_EXT
+#pragma OPENCL EXTENSION __cl_clang_bitfields : enable
+#endif
+
+struct test {
+ int a : 1;
+#ifndef BITFIELDS_EXT
+// expected-error@-2 {{bit-fields are not supported in OpenCL}}
+#endif
};
void no_vla(int n) {
Index: clang/test/Misc/r600.languageOptsOpenCL.cl
===================================================================
--- clang/test/Misc/r600.languageOptsOpenCL.cl
+++ clang/test/Misc/r600.languageOptsOpenCL.cl
@@ -39,6 +39,11 @@
#endif
#pragma OPENCL EXTENSION __cl_clang_non_portable_kernel_param_types : enable
+#ifndef __cl_clang_bitfields
+#error "Missing __cl_clang_bitfields define"
+#endif
+#pragma OPENCL EXTENSION __cl_clang_bitfields : enable
+
#ifdef cl_khr_fp16
#error "Incorrect cl_khr_fp16 define"
#endif
Index: clang/test/Misc/nvptx.languageOptsOpenCL.cl
===================================================================
--- clang/test/Misc/nvptx.languageOptsOpenCL.cl
+++ clang/test/Misc/nvptx.languageOptsOpenCL.cl
@@ -33,6 +33,11 @@
#endif
#pragma OPENCL EXTENSION __cl_clang_non_portable_kernel_param_types : enable
+#ifndef __cl_clang_bitfields
+#error "Missing __cl_clang_bitfields define"
+#endif
+#pragma OPENCL EXTENSION __cl_clang_bitfields : enable
+
#ifdef cl_khr_fp16
#error "Incorrect cl_khr_fp16 define"
#endif
Index: clang/test/Misc/amdgcn.languageOptsOpenCL.cl
===================================================================
--- clang/test/Misc/amdgcn.languageOptsOpenCL.cl
+++ clang/test/Misc/amdgcn.languageOptsOpenCL.cl
@@ -29,6 +29,11 @@
#endif
#pragma OPENCL EXTENSION __cl_clang_non_portable_kernel_param_types : enable
+#ifndef __cl_clang_bitfields
+#error "Missing __cl_clang_bitfields define"
+#endif
+#pragma OPENCL EXTENSION __cl_clang_bitfields : enable
+
#ifndef cl_khr_fp16
#error "Missing cl_khr_fp16 define"
#endif
Index: clang/lib/Sema/SemaDecl.cpp
===================================================================
--- clang/lib/Sema/SemaDecl.cpp
+++ clang/lib/Sema/SemaDecl.cpp
@@ -16815,8 +16815,10 @@
Record->setInvalidDecl();
InvalidDecl = true;
}
- // OpenCL v1.2 s6.9.c: bitfields are not supported.
- if (BitWidth) {
+ // OpenCL v1.2 s6.9.c: bitfields are not supported, unless Clang extension
+ // is enabled.
+ if (BitWidth && !getOpenCLOptions().isAvailableOption(
+ "__cl_clang_bitfields", LangOpts)) {
Diag(Loc, diag::err_opencl_bitfields);
InvalidDecl = true;
}
Index: clang/lib/Basic/Targets/NVPTX.h
===================================================================
--- clang/lib/Basic/Targets/NVPTX.h
+++ clang/lib/Basic/Targets/NVPTX.h
@@ -136,6 +136,7 @@
Opts["__cl_clang_function_pointers"] = true;
Opts["__cl_clang_variadic_functions"] = true;
Opts["__cl_clang_non_portable_kernel_param_types"] = true;
+ Opts["__cl_clang_bitfields"] = true;
Opts["cl_khr_fp64"] = true;
Opts["__opencl_c_fp64"] = true;
Index: clang/lib/Basic/Targets/AMDGPU.h
===================================================================
--- clang/lib/Basic/Targets/AMDGPU.h
+++ clang/lib/Basic/Targets/AMDGPU.h
@@ -288,6 +288,7 @@
Opts["__cl_clang_variadic_functions"] = true;
Opts["__cl_clang_function_pointers"] = true;
Opts["__cl_clang_non_portable_kernel_param_types"] = true;
+ Opts["__cl_clang_bitfields"] = true;
bool IsAMDGCN = isAMDGCN(getTriple());
Index: clang/include/clang/Basic/OpenCLExtensions.def
===================================================================
--- clang/include/clang/Basic/OpenCLExtensions.def
+++ clang/include/clang/Basic/OpenCLExtensions.def
@@ -88,6 +88,7 @@
OPENCL_EXTENSION(__cl_clang_function_pointers, true, 100)
OPENCL_EXTENSION(__cl_clang_variadic_functions, true, 100)
OPENCL_EXTENSION(__cl_clang_non_portable_kernel_param_types, true, 100)
+OPENCL_EXTENSION(__cl_clang_bitfields, true, 100)
// AMD OpenCL extensions
OPENCL_EXTENSION(cl_amd_media_ops, true, 100)
Index: clang/docs/LanguageExtensions.rst
===================================================================
--- clang/docs/LanguageExtensions.rst
+++ clang/docs/LanguageExtensions.rst
@@ -1741,6 +1741,34 @@
Clang supports internal OpenCL extensions documented below.
+``__cl_clang_bitfields``
+--------------------------------
+
+With this extension it is possible to enable bitfields in structs
+or unions using the OpenCL extension pragma mechanism detailed in
+`the OpenCL Extension Specification, section 1.2
+<https://www.khronos.org/registry/OpenCL/specs/3.0-unified/html/OpenCL_Ext.html#extensions-overview>`_.
+
+Use of bitfields in OpenCL kernels can result in reduced portability as struct
+layout is not guaranteed to be consistent when compiled by different compilers.
+If structs with bitfields are used as kernel function parameters, it can result
+in incorrect functionality when the layout is different between the host and
+device code.
+
+**Example of Use**:
+
+.. code-block:: c++
+
+ #pragma OPENCL EXTENSION __cl_clang_bitfields : enable
+ struct with_bitfield {
+ unsigned int i : 5; // compiled - no diagnostic generated
+ };
+
+ #pragma OPENCL EXTENSION __cl_clang_bitfields : disable
+ struct without_bitfield {
+ unsigned int i : 5; // error - bitfields are not supported
+ };
+
``__cl_clang_function_pointers``
--------------------------------
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