forked from OSchip/llvm-project
d9ca1f1596
This makes it possible for runtime implementations to disable subnormal handling at runtime. When this flag is enabled, decisions about how to handle subnormals in the library will be controlled by an external variable called __CLC_SUBNORMAL_DISABLE. Function implementations should use these new helpers for querying subnormal support: __clc_fp16_subnormals_supported(); __clc_fp32_subnormals_supported(); __clc_fp64_subnormals_supported(); In order for the library to link correctly with this feature, users will be required to either: 1. Insert this variable into the module (if using the LLVM/Clang C++/C APIs). 2. Pass either subnormal_disable.bc or subnormal_use_default.bc to the linker. These files are distributed with liblclc and installed to $(installdir). e.g.: llvm-link -o kernel-out.bc kernel.bc builtins-nosubnormal.bc subnormal_disable.bc or llvm-link -o kernel-out.bc kernel.bc builtins-nosubnormal.bc subnormal_use_default.bc If you do not supply the --enable-runtime-subnormal then the library behaves the same as it did before this commit. In addition to these changes, the patch adds helper functions that should be used when implementing library functions that need special handling for denormals: __clc_fp16_subnormals_supported(); __clc_fp32_subnormals_supported(); __clc_fp64_subnormals_supported(); llvm-svn: 235329 |
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| generic | ||
| ptx/lib | ||
| ptx-nvidiacl/lib | ||
| r600/lib | ||
| test | ||
| utils | ||
| www | ||
| CREDITS.TXT | ||
| LICENSE.TXT | ||
| README.TXT | ||
| compile-test.sh | ||
| configure.py | ||
README.TXT
libclc ------ libclc is an open source, BSD licensed implementation of the library requirements of the OpenCL C programming language, as specified by the OpenCL 1.1 Specification. The following sections of the specification impose library requirements: * 6.1: Supported Data Types * 6.2.3: Explicit Conversions * 6.2.4.2: Reinterpreting Types Using as_type() and as_typen() * 6.9: Preprocessor Directives and Macros * 6.11: Built-in Functions * 9.3: Double Precision Floating-Point * 9.4: 64-bit Atomics * 9.5: Writing to 3D image memory objects * 9.6: Half Precision Floating-Point libclc is intended to be used with the Clang compiler's OpenCL frontend. libclc is designed to be portable and extensible. To this end, it provides generic implementations of most library requirements, allowing the target to override the generic implementation at the granularity of individual functions. libclc currently only supports the PTX target, but support for more targets is welcome. Compiling and installing with Make ---------------------------------- $ ./configure.py --with-llvm-config=/path/to/llvm-config && make $ make install Note you can use the DESTDIR Makefile variable to do staged installs. $ make install DESTDIR=/path/for/staged/install Compiling and installing with Ninja ----------------------------------- $ ./configure.py -g ninja --with-llvm-config=/path/to/llvm-config && ninja $ ninja install Note you can use the DESTDIR environment variable to do staged installs. $ DESTDIR=/path/for/staged/install ninja install Website ------- http://www.pcc.me.uk/~peter/libclc/