最近，我在64位系统上运行了我的C++程序，该程序是在32位系统中构建和调优的，我注意到有一些糟糕的性能变化。在我的代码中，我使用了很多浮点变量。现在我怀疑这可能是这些糟糕变化的原因。当代码从32位系统移动到64位系统时，是否有任何方法可以避免这种性能变化？谢谢你的帮助。
我对此不是100%确定（可能接近20%），但如果32位浮点变量紧密地封装在一个数组或结构中（您提到它是为32位调优的），那么每一秒都可能“错位”，从而导致读取/写入该地址的开销/延迟。理想情况下，对象应该在64位系统的8字节边界上对齐。在某些系统上，对象必须正确对齐。
我怀疑你是否使用了很多浮点变量。更有可能的是，该系统（你没有给出任何细节）正在糟糕地运行32位->；64位。
典型的例子是运行一个为Windows 32位编译的程序，然后在安腾2 Windows 64位系统上运行。支持这种操作的WoW64子系统需要将x86指令转换为安腾指令，并支持32位应用程序的地址空间。安腾指令与x86非常不同。然而，在x64上做同样的事情会便宜得多，因为x64指令有点像x86的超集。
我希望这能有所帮助。由于我对你的具体情况一无所知，我不确定在这一点上我能不能帮你更多。
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