"Ioannis E. Venetis" <[EMAIL PROTECTED]> writes: > I downloaded gcc 4.0.1 and created the manual with 'make dvi'. While > browsing through it, I noticed the option -ftree-dse, which is > mentioned in paragraph 3.1 (Options summary) and in paragraph 3.10 > (Options That Control Optimization) under -O1. > > However, this option is not documented in the manual. What does it do?
It does dead store elimination. To quote from tree-ssa-dce.c: A dead store is a store into a memory location which will later be overwritten by another store without any intervening loads. In this case the earlier store can be deleted. Not describing this option is a documentation bug. If you feel like it, please submit a patch or a bug report (http://gcc.gnu.org/bugzilla/). Thanks. Ian
