问题描述
我想了解在D语言运行时的一些code。好像有不同的职能为以下两件事情：
I'm trying to understand some code in the D language runtime. It seems like there are separate functions for the following two things:
array1[] += scalar * array2[];
array1[] += array2[] * scalar;
为什么不能将这些可以用一个函数来完成？我想乘即使在不精确的浮点运算是可交换的。
Why can't these be done with one function? I thought multiplication was commutative even in inexact floating-point arithmetic.
推荐答案
我一无所知D语言，但我会高兴地回答您的标题问题：
I know nothing about the D language, but I'll happily answer the question in your title:
时的乘法总是不精确浮点运算可交换？
截至NaN值的有效载荷，是的。 IEEE-754浮点数乘法是可交换的（因此是添加）。如果你不知道什么是楠有效载荷，不用担心。
Up to the "payload" of NaN values, yes. IEEE-754 floating-point multiplication is commutative (and so is addition). If you don't know what the payload of a NaN is, don't worry about it.
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