print gcc optimization log
Ian Lance Taylor
iant@google.com
Thu Aug 16 18:31:00 GMT 2012
On Thu, Aug 16, 2012 at 8:15 AM, Xin Tong <xerox.time.tech@gmail.com> wrote:
> are these options enabled on production build, i.e. build i install
> with apt-get install gcc on ubuntu ?
Yes.
Ian
> On Wed, Aug 15, 2012 at 10:21 PM, Ian Lance Taylor <iant@google.com> wrote:
>> On Wed, Aug 15, 2012 at 8:58 PM, Xin Tong <xerox.time.tech@gmail.com> wrote:
>>> 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 ?
>>
>> Unfortunately GCC has very little in the way of logs intended for end
>> users. About all I know is the -ftree-vectorizer-verbose information,
>> which gives useful feedback about the vectorization optimizations.
>>
>> You can a lot of information by using -fdump-tree-all-details
>> -fdump-rtl-all-details, but it's difficult to interpret without the
>> source code and a working knowledge of GCC internals.
>>
>> Ian
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