https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103169
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Tamar Christina <tnfch...@gcc.gnu.org>: https://gcc.gnu.org/g:55d83cdf23b5f284b4e0bd0a6d1af3d947b2e7c3 commit r12-6993-g55d83cdf23b5f284b4e0bd0a6d1af3d947b2e7c3 Author: Tamar Christina <tamar.christ...@arm.com> Date: Wed Feb 2 10:39:03 2022 +0000 vect: Simplify and extend the complex numbers validation routines. This patch boosts the analysis for complex mul,fma and fms in order to ensure that it doesn't create an incorrect output. Essentially it adds an extra verification to check that the two nodes it's going to combine do the same operations on compatible values. The reason it needs to do this is that if one computation differs from the other then with the current implementation we have no way to deal with it since we have to remove the permute. When we can keep the permute around we can probably handle these by unrolling. While implementing this since I have to do the traversal anyway I took advantage of it by simplifying the code a bit. Previously we would determine whether something is a conjugate and then try to figure out which conjugate it is and then try to see if the permutes match what we expect. Now the code that does the traversal will detect this in one go and return to us whether the operation is something that can be combined and whether a conjugate is present. Secondly because it does this I can now simplify the checking code itself to essentially just try to apply fixed patterns to each operation. The patterns represent the order operations should appear in. For instance a complex MUL operation combines : Left 1 + Right 1 Left 2 + Right 2 with a permute on the nodes consisting of: { Even, Even } + { Odd, Odd } { Even, Odd } + { Odd, Even } By abstracting over these patterns the checking code becomes quite simple. As part of this I was checking the order of the operands which was left in "slp" order. as in, the same order they showed up in during SLP, which means that the accumulator is first. However it looks like I didn't document this and the x86 optab was implemented assuming the same order as FMA, i.e. that the accumulator is last. I have this changed the order to match that of FMA and FMS which corrects the x86 codegen and will update the Arm targets. This has now also been documented. gcc/ChangeLog: PR tree-optimization/102819 PR tree-optimization/103169 * doc/md.texi: Update docs for cfms, cfma. * tree-data-ref.h (same_data_refs): Accept optional offset. * tree-vect-slp-patterns.cc (is_linear_load_p): Fix issue with repeating patterns. (vect_normalize_conj_loc): Remove. (is_eq_or_top): Change to take two nodes. (enum _conj_status, compatible_complex_nodes_p, vect_validate_multiplication): New. (class complex_add_pattern, complex_add_pattern::matches, complex_add_pattern::recognize, class complex_mul_pattern, complex_mul_pattern::recognize, class complex_fms_pattern, complex_fms_pattern::recognize, class complex_operations_pattern, complex_operations_pattern::recognize, addsub_pattern::recognize): Pass new cache. (complex_fms_pattern::matches, complex_mul_pattern::matches): Pass new cache and use new validation code. * tree-vect-slp.cc (vect_match_slp_patterns_2, vect_match_slp_patterns, vect_analyze_slp): Pass along cache. (compatible_calls_p): Expose. * tree-vectorizer.h (compatible_calls_p, slp_node_hash, slp_compat_nodes_map_t): New. (class vect_pattern): Update signatures include new cache. gcc/testsuite/ChangeLog: PR tree-optimization/102819 PR tree-optimization/103169 * g++.dg/vect/pr99149.cc: xfail for now. * gcc.dg/vect/complex/pr102819-1.c: New test. * gcc.dg/vect/complex/pr102819-2.c: New test. * gcc.dg/vect/complex/pr102819-3.c: New test. * gcc.dg/vect/complex/pr102819-4.c: New test. * gcc.dg/vect/complex/pr102819-5.c: New test. * gcc.dg/vect/complex/pr102819-6.c: New test. * gcc.dg/vect/complex/pr102819-7.c: New test. * gcc.dg/vect/complex/pr102819-8.c: New test. * gcc.dg/vect/complex/pr102819-9.c: New test. * gcc.dg/vect/complex/pr103169.c: New test.
