On Thu, Feb 16, 2017 at 6:48 PM, Bin Cheng <bin.ch...@arm.com> wrote: > Hi, > After fixing PR79347, the main problem with vectorizer is we scale down > profiling counters > for vect_loop by VF, regardless of context CFG's profiling information. This > is wrong and > sometimes makes vect_loop not hot code, which may confuses following > optimizers. This > patch generates well-formed profiling information as generic tree unroller > does. It borrows > code from tree-ssa-loop-manip.c and does small refactors to existing code. > Vectorizer will > not introduce mismatch counters with it, and unroll and vrp2 are the two > major passes > messing up profiling counters now. Though it removes all mismatch in > vectorizer, I am not > sure if this counts as a regression fix. > BTW, it may also help PR78116? Hi Pat, could you please help verify this? > Thanks! > > Bootstrap and test on x86_64 and AArch64 ongoing. Is it OK if no failures?
The patch looks good to me but please wait for Honza to comment. Thanks, Richard. > Thanks, > bin > > 2017-02-16 Bin Cheng <bin.ch...@arm.com> > > PR tree-optimization/77536 > * tree-ssa-loop-manip.c (niter_for_unrolled_loop): New function. > (tree_transform_and_unroll_loop): Use above function to compute the > estimated niter of unrolled loop. > * tree-ssa-loop-manip.h niter_for_unrolled_loop(): New declaration. > * tree-vect-loop.c (scale_profile_for_vect_loop): New function. > (vect_transform_loop): Call above function. > > gcc/testsuite/ChangeLog > 2017-02-16 Bin Cheng <bin.ch...@arm.com> > > PR tree-optimization/77536 > * gcc.dg/vect/pr79347.c: Revise testing string.
