https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62014
--- Comment #6 from ktkachov at gcc dot gnu.org --- One crude way to look is by looking for the "w" constraint that signifies usage of FP registers in the md files and seeing whether those usages are properly guarded by the 'simd' attribute or by TARGET_FLOAT/TARGET_SIMD. One quick search shows the absdi2 define_insn_and_split that uses 'w' in its second alternative to emit "abs\\t%d0, %d1" but doesn't guard it by the 'simd' attribute. Maybe that's a place to start to construct a testcase
