diff options
Diffstat (limited to 'Eigen/src/Core/util/Macros.h')
| -rw-r--r-- | Eigen/src/Core/util/Macros.h | 64 |
1 files changed, 63 insertions, 1 deletions
diff --git a/Eigen/src/Core/util/Macros.h b/Eigen/src/Core/util/Macros.h index ac514cbb4..43890eab1 100644 --- a/Eigen/src/Core/util/Macros.h +++ b/Eigen/src/Core/util/Macros.h @@ -51,7 +51,11 @@ #ifndef EIGEN_STACK_ALLOCATION_LIMIT // 131072 == 128 KB -#define EIGEN_STACK_ALLOCATION_LIMIT 131072 +#if defined(__AVX512F__) + #define EIGEN_STACK_ALLOCATION_LIMIT 0 +#else + #define EIGEN_STACK_ALLOCATION_LIMIT 16384 +#endif #endif //------------------------------------------------------------------------------------------ @@ -1063,6 +1067,64 @@ namespace Eigen { #endif +// Acts as a barrier preventing operations involving `X` from crossing. This +// occurs, for example, in the fast rounding trick where a magic constant is +// added then subtracted, which is otherwise compiled away with -ffast-math. +// +// See bug 1674 +#if !defined(EIGEN_OPTIMIZATION_BARRIER) + #if EIGEN_COMP_GNUC + // According to https://gcc.gnu.org/onlinedocs/gcc/Constraints.html: + // X: Any operand whatsoever. + // r: A register operand is allowed provided that it is in a general + // register. + // g: Any register, memory or immediate integer operand is allowed, except + // for registers that are not general registers. + // w: (AArch32/AArch64) Floating point register, Advanced SIMD vector + // register or SVE vector register. + // x: (SSE) Any SSE register. + // (AArch64) Like w, but restricted to registers 0 to 15 inclusive. + // v: (PowerPC) An Altivec vector register. + // wa:(PowerPC) A VSX register. + // + // "X" (uppercase) should work for all cases, though this seems to fail for + // some versions of GCC for arm/aarch64 with + // "error: inconsistent operand constraints in an 'asm'" + // Clang x86_64/arm/aarch64 seems to require "g" to support both scalars and + // vectors, otherwise + // "error: non-trivial scalar-to-vector conversion, possible invalid + // constraint for vector type" + // + // GCC for ppc64le generates an internal compiler error with x/X/g. + // GCC for AVX generates an internal compiler error with X. + // + // Tested on icc/gcc/clang for sse, avx, avx2, avx512dq + // gcc for arm, aarch64, + // gcc for ppc64le, + // both vectors and scalars. + // + // Note that this is restricted to plain types - this will not work + // directly for std::complex<T>, Eigen::half, Eigen::bfloat16. For these, + // you will need to apply to the underlying POD type. + #if EIGEN_ARCH_PPC + // General, Altivec, VSX. + #define EIGEN_OPTIMIZATION_BARRIER(X) __asm__ ("" : "+r,v,wa" (X)); + #elif EIGEN_ARCH_ARM_OR_ARM64 + // General, NEON. + #define EIGEN_OPTIMIZATION_BARRIER(X) __asm__ ("" : "+g,w" (X)); + #elif EIGEN_ARCH_i386_OR_x86_64 + // General, SSE. + #define EIGEN_OPTIMIZATION_BARRIER(X) __asm__ ("" : "+g,x" (X)); + #else + // Not implemented for other architectures. + #define EIGEN_OPTIMIZATION_BARRIER(X) + #endif + #else + // Not implemented for other compilers. + #define EIGEN_OPTIMIZATION_BARRIER(X) + #endif +#endif + #if EIGEN_COMP_MSVC // NOTE MSVC often gives C4127 warnings with compiletime if statements. See bug 1362. // This workaround is ugly, but it does the job. |