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Clarify the support of constexpr

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This commit is contained in:
Christophe Riccio 2018-08-27 20:19:19 +02:00
parent bde7af55b1
commit 2fdc2dc748
3 changed files with 9 additions and 4 deletions
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8
glm/detail/setup.hpp
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@ -274,12 +274,14 @@
// N2235 Generalized Constant Expressions http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf
// N3652 Extended Constant Expressions http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3652.html
#if (GLM_COMPILER & GLM_COMPILER_CLANG) && !(GLM_ARCH & GLM_ARCH_SIMD_BIT)
#if (GLM_ARCH & GLM_ARCH_SIMD_BIT) // Compiler SIMD intrinsics don't support constexpr...
# define GLM_HAS_CONSTEXPR 0
#elif (GLM_COMPILER & GLM_COMPILER_CLANG)
# define GLM_HAS_CONSTEXPR __has_feature(cxx_relaxed_constexpr)
#elif (GLM_LANG & GLM_LANG_CXX14_FLAG) && !(GLM_ARCH & GLM_ARCH_SIMD_BIT)
#elif (GLM_LANG & GLM_LANG_CXX14_FLAG)
# define GLM_HAS_CONSTEXPR 1
#else
# define GLM_HAS_CONSTEXPR ((GLM_LANG & GLM_LANG_CXX0X_FLAG) && !(GLM_ARCH & GLM_ARCH_SIMD_BIT) && GLM_HAS_INITIALIZER_LISTS && (\
# define GLM_HAS_CONSTEXPR ((GLM_LANG & GLM_LANG_CXX0X_FLAG) && GLM_HAS_INITIALIZER_LISTS && (\
((GLM_COMPILER & GLM_COMPILER_INTEL) && (GLM_COMPILER >= GLM_COMPILER_INTEL17)) || \
((GLM_COMPILER & GLM_COMPILER_VC) && (GLM_COMPILER >= GLM_COMPILER_VC15))))
#endif

4
manual.md
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@ -390,12 +390,14 @@ For example, if a program is compiled with Visual Studio using `/arch:AVX`, GLM
It’s possible to avoid the instruction set detection by forcing the use of a specific instruction set with one of the fallowing define:
`GLM_FORCE_SSE2`, `GLM_FORCE_SSE3`, `GLM_FORCE_SSSE3`, `GLM_FORCE_SSE41`, `GLM_FORCE_SSE42`, `GLM_FORCE_AVX`, `GLM_FORCE_AVX2` or `GLM_FORCE_AVX512`.
The use of intrinsic functions by GLM implementation can be avoided using the define `GLM_FORCE_PURE` before any inclusion of GLM headers.
The use of intrinsic functions by GLM implementation can be avoided using the define `GLM_FORCE_PURE` before any inclusion of GLM headers. This can be particularly useful if we want to rely on C++14 `constexpr`.
```cpp
#define GLM_FORCE_PURE
#include <glm/glm.hpp>
static_assert(glm::vec4::length() == 4, "Using GLM C++ 14 constexpr support for compile time tests");
// GLM code will be compiled using pure C++ code without any intrinsics
```

1
readme.md
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@ -67,6 +67,7 @@ glm::mat4 camera(float Translate, glm::vec2 const& Rotate)
- Added identity functions #765
- Splitted headers into EXT extensions to improve compilation time #670
- Added separated performance tests
- Refactor manual, lists all configuration defines
#### Fixes:
- Fixed SIMD detection on Clang and GCC