编译器有一个选项 -use_fast_math,指定该选项后将在编译时强制下表中的每个函数编译为其对应的内部函数。 内部函数除了会降低函数的计算结果的精度外,还可能在一些特殊情况下与标准函数存在差异。所以推荐通过调用内联函数来选择性地替换标准数学函数,具体是否替换需要用户根据实际任务权衡。 函数操作设备函数 x / y...
normf(dim,arr) An error bound can't be provided because a fast algorithm is used with accuracy loss due to round-off rnormf(dim,arr) An error bound can't be provided because a fast algorithm is used with accuracy loss due to round-off expf(x) 2 (full range) exp2f(x) 2 (full ...
它们映射到更少的原生指令时速度更快。 编译器有一个选项(-use_fast_math),它强制表8中的每个函数编译为其内部对应部分。 除了降低受影响功能的准确性之外,还可能会在特殊情况下处理一些差异。 更稳健的方法是通过调用内部函数来选择性地替换数学函数调用,只有在性能增益的情况下才适用数学函数调用,并且可以容忍更改...
More precisely, the argument reduction code (see Mathematical Functions for implementation) comprises two code paths referred to as the fast path and the slow path,respectively. The fast path is used for arguments sufficiently small in magnitude and essentially consists of a few multiply-add operatio...
Table 9. Functions Affected by -use_fast_math Operator/FunctionDevice Function x/y __fdividef(x,y) sinf(x) __sinf(x) cosf(x) __cosf(x) tanf(x) __tanf(x) sincosf(x,sptr,cptr) __sincosf(x,sptr,cptr) logf(x) __logf(x) log2f(x) __log2f(x) l...
NVIDIA CUDA Toolkit RN-06722-001 _v11.7 | 19 CUDA Libraries 2.3.3. cuRAND: Release 11.0 Update 1 ‣ Resolved Issues ‣ Fixed an issue that caused linker errors about the multiple definitions of mtgp32dc_params_fast_11213 and mtgpdc_params_11213_num when ...
Functions Affected by -use_fast_math ... 295 Table 10. Single-Precision Floating-Point Intrinsic Functions ... 295 Table 11. Double-Precision Floating-Point Intrinsic Functions ... 297 Table 12. C++11 Language Features ...
(x,y) NVIDIA Confidential Compile time optimization CUDA-C -use_fast_math coerces all func() calls to compile as __func() OpenCL -cl-fast-relaxed-math -cl-mad-enable permits use of FMADS NVIDIA Confidential Conversion instructions chars and shorts will likely need to be converted to int...
I’m assuming that timing is using the fast math functions in cuda? What does the final sum come out to be and how does it compare? How does the timing change if you use the more accurate versions? Since I use a slightly different size of data set, I’ll quote my GFLOP/s (assumin...
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