Messages in this thread | | | Date | Mon, 25 Apr 2005 11:50:29 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [PATCH GIT 0.6] make use of register variables & size_t |
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On Mon, 25 Apr 2005, Matthias-Christian Ott wrote: > > But this makes, like "register", direct use of processor registers (it > stores int arguments in eax, ebx, etc.).
No. It make _unlike_ "register", direct use of processor registers.
The "register" keyword does _not_ use processor registers. It's just syntactic fluff, and tells the compiler exactly one thing:
- that the compiler should warn if you take the address of such a thing.
In addition, the compiler may generate code that takes it into account, which most likely means _worse_ code than if it didn't take it into account.
In contrast regparm() actually says something very relevant: it says that the function uses a totally different calling convention.
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