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Re: PRE (sometimes) confuses ivopts/scev?




On Wed, 26 Jan 2005, Richard Guenther wrote:

On Wed, 26 Jan 2005, Richard Guenther wrote:

and the code produced is even better than before with -fno-tree-pre!

For a runtime test of the tramp3d testcase we gain about 2% in
runtime compared to -fno-tree-pre and about 5% compared to -ftree-pre
without your patch.

Btw., we take a compile-time hit of ~0.5% for the tramp3d testcase, but this could well be noise.

Can you give this patch a try and let me know if it still has the same effect?
It's like the last patch, only it will remove dead code that is not inserted.
(It's currently in stage2 of bootstrap, but my last version of itpassed all regressions test, and all i did was update the comments and remove the processed sbitmap :P)


--Dan

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