[Bug target/63615] New: [i686][5 Regression] FAIL: gcc.target/i386/addr-sel-1.c

[izamyatin at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63615

            Bug ID: 63615
           Summary: [i686][5 Regression] FAIL:
                    gcc.target/i386/addr-sel-1.c
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: izamyatin at gmail dot com
            Target: i686

There is a new fail for gcc.target/i386/addr-sel-1.c on i686 after r216462

For this test we now have in asm file

        movl    4(%esp), %eax
        leal    1(%eax), %edx
        movsbl  a(%edx), %ecx
        movsbl  b(%edx), %eax
        addl    %ecx, %eax
        ret


instead of earlier

        movl    4(%esp), %eax
        movsbl  a+1(%eax), %ecx
        movsbl  b+1(%eax), %eax
        addl    %ecx, %eax
        ret

Seems the change resticts some opts in postreload. Now in .postreload there are 

(insn 6 21 8 2 (parallel [
              (set (reg:SI 1 dx [orig:83 D.1733 ] [83])
                  (plus:SI (reg:SI 0 ax [96])
                      (const_int 1 [0x1])))
              (clobber (reg:CC 17 flags))
          ]) ../gcc/testsuite/gcc.target/i386/addr-sel-1.c:13 220 {*addsi_1}
       (nil))
(insn 8 6 10 2 (set (reg:SI 2 cx [orig:93 D.1733 ] [93])
          (sign_extend:SI (mem/j:QI (plus:SI (reg:SI 1 dx [orig:83 D.1733 ]
[83])
                      (symbol_ref:SI ("a")  <var_decl 0x7f7b4a70fc60 a>)) [0 a
S1 A8]))) ../gcc/testsuite/gcc.target/i386/addr-sel-1.c:13 148 {extendqisi2}
       (nil))

while earlier there were

(insn 6 21 8 2 (parallel [
            (set (reg:SI 1 dx [orig:83 D.1733 ] [83])
                (plus:SI (reg:SI 0 ax [96])
                    (const_int 1 [0x1])))
            (clobber (reg:CC 17 flags))
        ]) addr-sel-1-good.c:13 220 {*addsi_1}
     (nil))
(insn 8 6 10 2 (set (reg:SI 2 cx [orig:93 D.1733 ] [93])
        (sign_extend:SI (mem/j:QI (plus:SI (reg:SI 0 ax [96])
                    (const:SI (plus:SI (symbol_ref:SI ("a")  <var_decl
0x7fbf3c296c60 a>)
                            (const_int 1 [0x1])))) [0 a S1 A8])))
addr-sel-1-good.c:13 148 {extendqisi2}
     (nil))

so insn 6 is not needed