Thanks for the quick response, Alexander!

Vivek Kinhekar

-----Original Message-----
From: Alexander Monakov <> 
Sent: Friday, April 13, 2018 5:58 PM
To: Vivek Kinhekar <>
Subject: Re: GCC Compiler Optimization ignores or mistreats MFENCE memory 
barrier related instruction

On Fri, 13 Apr 2018, Vivek Kinhekar wrote:
> The mfence instruction with memory clobber asm instruction should 
> create a barrier between division and printf instructions.

No, floating-point division does not touch memory, so the asm does not (and 
need not) restrict its motion.


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