On Mon, 8 Dec 2014, Richard Biener wrote: > The alternative is to decide "used" in the middle-end at one point, > for example at the end of all_lowering_passes where hopefully > we have constant folded and removed dead code enough. We can also > compute an overall "uses libm" flag to fix the testcase I reported > (of course we'd like to re-compute that at LTO time).
If you do that, of course any optimizations before deciding "used" need to be conservative - assume that any function except the one you're optimizing a call of is not "used". -- Joseph S. Myers jos...@codesourcery.com
