Re: A case that PRE optimization hurts performance

[Václav Zeman]

On Tue, 2 Aug 2011 10:37:03 +0800, Jiangning Liu wrote:

Hi,

For the following simple test case, PRE optimization hoists computation (s!=1) into the default branch of the switch statement, and finally causes very poor code generation. This problem occurs in both X86 and ARM, and I

believe it is also a problem for other targets.

[...]

Do you have any idea about this?

Fill a bug report to GCC Bugzilla <http://gcc.gnu.org/bugzilla/>

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VZ