c106825b93
In discussions with Andrew we realized varying_p() was returning true for a range of the entire domain with a non-empty nonzero mask. This is confusing as varying_p() should only return true when absolutely no information is available. A nonzero mask that has any cleared bits is extra information and must return false for varying_p(). This patch fixes this oversight. Now a range of the entire domain with nonzero bits, is internally set to VR_RANGE (with the appropriate end points set). VR_VARYING ranges must have a null nonzero mask. Also, the union and intersect code were not quite right in the presence of nonzero masks. Sometimes we would drop masks to -1 unnecessarily. I was trying to be too smart in avoiding extra work when the mask was NULL, but there's also an implicit mask in the range that must be taken into account. For example, [0,0] may have no nonzero bits set explicitly, but the mask is really 0x0. This will all be simpler when we drop trees, because the nonzero bits will always be set, even if -1. Finally, I've added unit tests to the nonzero mask code. This should help us maintain sanity going forward. There should be no visible changes, as the main consumer of this code is the SSA_NAME_RANGE_INFO patchset which has yet to be committed. Tested on x86-64 Linux. gcc/ChangeLog: * value-range.cc (irange::operator=): Call verify_range. (irange::irange_set): Normalize kind after everything else has been set. (irange::irange_set_anti_range): Same. (irange::set): Same. (irange::verify_range): Disallow nonzero masks for VARYING. (irange::irange_union): Call verify_range. Handle nonzero masks better. (irange::irange_intersect): Same. (irange::set_nonzero_bits): Calculate mask if either range has an explicit mask. (irange::intersect_nonzero_bits): Same. (irange::union_nonzero_bits): Same. (range_tests_nonzero_bits): New. (range_tests): Call range_tests_nonzero_bits. * value-range.h (class irange): Remove set_nonzero_bits method with trees. (irange::varying_compatible_p): Set nonzero mask. |
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