On 03/16/2016 11:35 PM, Dominik Vogt wrote: > How does combine get this idea (it's the only match in the > function)? > > Trying 7 -> 12: > Successfully matched this instruction: > (set (reg/i:DI 2 %r2) > (and:DI (subreg:DI (reg:SI 64) 0) > (const_int 4294901775 [0xffff000f]))) > allowing combination of insns 7 and 12
>From the recorded nonzero_bits. > (Eventually the two "and"s with constant values > are not merged into a single "and" with a single constant.) That's a concern... r~
