print gcc optimization log

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To: gcc-help@xxxxxxxxxxx
Subject: print gcc optimization log
From: Xin Tong <xerox.time.tech@xxxxxxxxx>
Date: Wed, 15 Aug 2012 20:58:55 -0700
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I sometimes run into issues where i want to figure out why gcc is
performing a specific optimization and what the optimization affects
the tree. is there any documents on how to print gcc optimizations and
code generation logs ?

Xin

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