https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96682
--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Joe Ramsay <joeram...@gcc.gnu.org>: https://gcc.gnu.org/g:10e0d2010f0597e6ae7efb88142b8820608c585e commit r10-8643-g10e0d2010f0597e6ae7efb88142b8820608c585e Author: Joe Ramsay <joe.ram...@arm.com> Date: Wed Jul 29 14:04:28 2020 +0100 arm: Enable no-writeback vldr.16/vstr.16. There was previously no way to specify that a register operand cannot have any writeback modifiers, and as a result the argument to vldr.16 and vstr.16 could be erroneously output with post-increment. This change adds a constraint which forbids all writeback, and selects it in the relevant case for vldr.16 and vstr.16 gcc/ChangeLog: PR target/96682 * config/arm/arm-protos.h (arm_coproc_mem_operand_no_writeback): Declare prototype. (arm_mve_mode_and_operands_type_check): Declare prototype. * config/arm/arm.c (arm_coproc_mem_operand): Refactor to use _arm_coproc_mem_operand. (arm_coproc_mem_operand_wb): New function to cover full, limited and no writeback. (arm_coproc_mem_operand_no_writeback): New constraint for memory operand with no writeback. (arm_print_operand): Extend 'E' specifier for memory operand that does not support writeback. (arm_mve_mode_and_operands_type_check): New constraint check for MVE memory operands. * config/arm/constraints.md: Add Uj constraint for VFP vldr.16 and vstr.16. * config/arm/vfp.md (*mov_load_vfp_hf16): New pattern for vldr.16. (*mov_store_vfp_hf16): New pattern for vstr.16. (*mov<mode>_vfp_<mode>16): Remove MVE moves. gcc/testsuite/ChangeLog: PR target/96682 * gcc.target/arm/mve/intrinsics/mve-vldstr16-no-writeback.c: New test. (cherry picked from commit 9f6abd2db90151c8966d2d2718ab8c299abf1105)
