On Fri, Sep 16, 2016 at 12:56:37PM +0300, Niko Tyni wrote:

> I haven't found the exact optimization that's triggering it yet,

At -O1 it goes away with -fno-inline-functions-called-once .

> and I haven't looked at the code GCC generates.

Diffstat for timer.s between -O1 and "-O1 -fno-inline-functions-called-once" is

 1 file changed, 605 insertions(+), 492 deletions(-)

Not sure how helpful that is.
-- 
Niko

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