[cfe-dev] RFC: Support x86 interrupt and exception handlers

Joerg Sonnenberger via cfe-dev cfe-dev at lists.llvm.org
Mon Sep 21 13:56:25 PDT 2015

On Mon, Sep 21, 2015 at 01:45:41PM -0700, H.J. Lu via cfe-dev wrote:
> The main purpose of x86 interrupt attribute is to allow programmers
> to write x86 interrupt/exception handlers in C WITHOUT assembly
> stubs to avoid extra branch from assembly stubs to C functions.

Let's take just this statement. Are you sure that the call/ret pair for
such a stub has *any* significant impact on the interrupt latency?
I'm quite doubtful of that. That's completely ignoring the fact that raw
interrupt or exception latency is generally not an issue.


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