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例如，我有一个像a = b * c + d * e + f * g + h * i + j. 我应该写a = fma(a, c, fma(d, e, fma(f, g, fma(h, i, j))))吗？
a = b * c + d * e + f * g + h * i + j
a = fma(a, c, fma(d, e, fma(f, g, fma(h, i, j))))
编译器会自动优化表达式吗？还是 fma 形式实际上比普通形式更好？
我发现很难知道内核在 C++AMP 中编译成什么......我应该切换到 OpenCL 吗？