Adhemerval Zanella 2149da3683 riscv: Fix alignment-ignorant memcpy implementation ... The memcpy optimization (commit 587a1290a1) has a series of mistakes: - The implementation is wrong: the chunk size calculation is wrong leading to invalid memory access. - It adds ifunc supports as default, so --disable-multi-arch does not work as expected for riscv. - It mixes Linux files (memcpy ifunc selection which requires the vDSO/syscall mechanism) with generic support (the memcpy optimization itself). - There is no __libc_ifunc_impl_list, which makes testing only check the selected implementation instead of all supported by the system. This patch also simplifies the required bits to enable ifunc: there is no need to memcopy.h; nor to add Linux-specific files. The __memcpy_noalignment tail handling now uses a branchless strategy similar to aarch64 (overlap 32-bits copies for sizes 4..7 and byte copies for size 1..3). Checked on riscv64 and riscv32 by explicitly enabling the function on __libc_ifunc_impl_list on qemu-system. Changes from v1: * Implement the memcpy in assembly to correctly handle RISCV strict-alignment. Reviewed-by: Evan Green <evan@rivosinc.com> Acked-by: Palmer Dabbelt <palmer@rivosinc.com>		2024-03-12 14:38:08 -03:00
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memcpy_noalignment.S	riscv: Fix alignment-ignorant memcpy implementation	2024-03-12 14:38:08 -03:00
memcpy-generic.c	riscv: Fix alignment-ignorant memcpy implementation	2024-03-12 14:38:08 -03:00