https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107714
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Stam Markianos-Wright <stamm...@gcc.gnu.org>: https://gcc.gnu.org/g:4269a6567eb991e6838f40bda5be9e3a7972530c commit r13-4935-g4269a6567eb991e6838f40bda5be9e3a7972530c Author: Stam Markianos-Wright <stam.markianos-wri...@arm.com> Date: Fri Dec 30 11:25:22 2022 +0000 Fix memory constraint on MVE v[ld/st][2/4] instructions [PR107714] In the M-Class Arm-ARM: https://developer.arm.com/documentation/ddi0553/bu/?lang=en these MVE instructions only have '!' writeback variant and at: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107714 we found that the Um constraint would also allow through a register offset writeback, resulting in an assembler error. Here I have added a new constraint and predicate for these instructions, which (uniquely, AFAICT), only support a `!` writeback increment by the data size (inside the compiler this is a POST_INC). No regressions in arm-none-eabi with MVE and MVE.FP. gcc/ChangeLog: PR target/107714 * config/arm/arm-protos.h (mve_struct_mem_operand): New protoype. * config/arm/arm.cc (mve_struct_mem_operand): New function. * config/arm/constraints.md (Ug): New constraint. * config/arm/mve.md (mve_vst4q<mode>): Change constraint. (mve_vst2q<mode>): Likewise. (mve_vld4q<mode>): Likewise. (mve_vld2q<mode>): Likewise. * config/arm/predicates.md (mve_struct_operand): New predicate. gcc/testsuite/ChangeLog: PR target/107714 * gcc.target/arm/mve/intrinsics/vldst24q_reg_offset.c: New test.
