GCC功能后缀“isra”是什么？意思？

问题描述

在分析使用gcc编译的程序时，我注意到了诸如 foo.isra.3 之类的函数。 isra 表示什么？我注意到其中一个函数只在几个地方被调用，其中一个参数总是被指定为一个文字值。也许它意味着它是为某些参数优化的函数的变体？

根据（和我能找到的类似评论）：

IPA SRA是一个：

所以最有可能的是，它是具有这些优化的函数的一个版本。

在你提到的情况下，它可能会用传值代替传递引用，因为它知道没有必要通过引用来传递文字。

While profiling a program compiled with gcc, I noticed functions like foo.isra.3. What does isra indicate? I notice that one of the functions is only called in a few places, and one of the arguments is always specified as a literal value. Maybe it means it's a variant of the function optimised for certain arguments?

解决方案

According to a comment on this bug report (and similar comments I could find):

IPA SRA is an optimization option:

So most likely, it's a version of a function with those optimizations.

In the case you mentioned, it's possible that it's replacing a pass-by-reference with a pass-by-value since it knows there's no point to passing a literal by reference.

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