[Bug target/60539] New: [SH] builtin string functions ignore loop and label alignment

[olegendo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60539

            Bug ID: 60539
           Summary: [SH] builtin string functions ignore loop and label
                    alignment
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: olegendo at gcc dot gnu.org
                CC: christian.bruel at st dot com
            Target: sh*-*-*

The following function:

unsigned int test (const char* x)
{
  return __builtin_strlen (x);
}

compiled with -m4 -O2:
        mov     r4,r0
        tst     #3,r0
        bf/s    .L14
        mov     r4,r1
        mov     #0,r3
.L12:
        mov.l   @r1+,r2
        cmp/str r3,r2
        bf      .L12
        add     #-4,r1
.L14:
        mov.b   @r1+,r2
        tst     r2,r2
        bf/s    .L14
        mov     r1,r0
        rts
        subc    r4,r0

The loop and label alignments are missing.  E.g. when not optimizing for size,
the loop alignment is set to '4 bytes' (.align 2), which seems to be ignored by
the code that expands the builtin functions.