How to turn off constan multiplication optmization

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To: "gcc-help@xxxxxxxxxxx" <gcc-help@xxxxxxxxxxx>
Subject: How to turn off constan multiplication optmization
From: Feng Xue <fxue@xxxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 29 Nov 2018 03:32:56 +0000

Hi,

   We just want to evaluate effect of constant multiplication optimization, which translates mul to shift/lea. Is there a switch option to explicitly turn on/off this opt in gcc? Thanks,

Best Regards,
Feng

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