------- Comment #4 from rguenth at gcc dot gnu dot org 2010-04-21 22:13 ------- (In reply to comment #2) > Here's what the compiler currently says about one of these calls using "-flto > -fipa-pta -fwhole-program -fdump-tree-optimized-alias -O3 -fomit-frame-pointer > -ffastmath": > > # PT = nonlocal unit-escaped > D.9637_762 = h_79(D)->mc.mc_luma; > # PT = nonlocal unit-escaped > D.9343_763 = m_61(D)->weight; > bmy_764 = bmy_20 + 1; > D.9344_765 = m_61(D)->i_stride[0]; > # USE = anything > # CLB = anything > D.9637_762 (&pix[16], 64, D.9345_761, D.9344_765, bmx_5, bmy_764, bw_63, > bh_65, > D.9343_763); > > After the linking step, using LTO: > > # PT = anything > D.54843_762 = h_79(D)->mc.mc_luma; > # PT = anything > D.55040_763 = m_61(D)->weight; > bmy_764 = bmy_20 + 1; > D.55039_765 = m_61(D)->i_stride[0]; > # USE = anything > # CLB = anything > D.54843_762 (&pix[16], 64, D.55038_761, D.55039_765, bmx_5, bmy_764, bw_63, > bh_65, D.55040_763); > > If I'm reading this right, it doesn't seem it's able to infer anything > whatsoever about it.
It indeed looks like not useful information (though it's odd that at link time it drops to all "anything"). -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43827
