https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100000
--- Comment #2 from Richard Earnshaw <rearnsha at gcc dot gnu.org> --- If the testcase is built with -march=armv8.1-m.main+mve.fp then the useless stack adjustments go away. I think that's because V4SFmode is not a supported vector mode for integer MVE - see arm_vector_mode_supported_p() in arm.cc. When it isn't a builtin type we end up with a BLKmode object that the compiler creates a stack-slot for, even though no RTL is ever generated to use the slot in this case.
