https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63259
--- Comment #11 from Oleg Endo <olegendo at gcc dot gnu.org> --- (In reply to thopre01 from comment #10) > > I have the same gimple and for me the bswap is correctly detected. Can you > break at find_bswap_or_nop just after calling find_bswap_or_nop_1 on the if > (!source_stmt) and show me the output of p/x n->n ? n->n = 0x0000000000000102 limit = 4 For both, test_099 and test_08. > Indeed, my mistake. Ok I tested a bit and found that the problem is the > depth at which it's looking. Try to recompile tree-ssa-math-opts.c after > increasing the limit number in find_bswap_or_nop. Right now the limit will > evaluate to 4 and the gimple I have has a depth of 5. I've tried ... limit += 10 + (int) ceil_log2 ((unsigned HOST_WIDE_INT) limit); ... but it doesn't change anything here.
