[Bug target/109465] New: LoongArch: The expansion of memcpy is slow and bloated for some sizes

[xry111 at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109465

            Bug ID: 109465
           Summary: LoongArch: The expansion of memcpy is slow and bloated
                    for some sizes
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: xry111 at gcc dot gnu.org
  Target Milestone: ---

extern char *a, *b;

void test() { __builtin_memcpy(a, b, 15); }

With -mno-strict-align, this is compiled to 15 ld.bu/st.b pairs instead of the
optimal (4 pairs).

All size values >= 19 (except 24) seem affected.