[Bug middle-end/45722] [4.6 Regression] FAIL: gcc.c-torture/execute/20040709-2.c execution at -O1 and -Os

[danglin at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45722

--- Comment #14 from John David Anglin <danglin at gcc dot gnu.org> 2010-10-11 
16:30:09 UTC ---
At -O0, memcpy is used.  So, problem doesn't occur.

;; x = sB;

(insn 81 80 82 (set (reg/f:SI 160)        (high:SI (symbol_ref:SI ("sB") [flags
0x200]  <var_decl 0x4028f420 sB>))
) pr45722-2.c:48 -1
     (nil))

(insn 82 81 83 (set (reg/f:SI 159)
        (lo_sum:SI (reg/f:SI 160)
            (symbol_ref:SI ("sB") [flags 0x200]  <var_decl 0x4028f420 sB>)))
pr4
5722-2.c:48 -1
     (expr_list:REG_EQUAL (symbol_ref:SI ("sB") [flags 0x200]  <var_decl
0x4028f
420 sB>)
        (nil)))

(insn 83 82 84 (set (reg:SI 161)
        (plus:SI (reg/f:SI 91 virtual-stack-vars)
            (const_int 24 [0x18]))) pr45722-2.c:48 -1
     (nil))

(insn 84 83 85 (set (reg/f:SI 162)
        (reg/f:SI 159)) pr45722-2.c:48 -1
     (nil))

(insn 85 84 86 (set (reg:SI 163)
        (const_int 6 [0x6])) pr45722-2.c:48 -1
     (nil))

(insn 86 85 87 (set (reg:SI 26 %r26)
        (reg:SI 161)) pr45722-2.c:48 -1
     (nil))

(insn 87 86 88 (set (reg:SI 25 %r25)
        (reg/f:SI 162)) pr45722-2.c:48 -1
     (nil))

(insn 88 87 89 (set (reg:SI 24 %r24)
        (reg:SI 163)) pr45722-2.c:48 -1
     (nil))

(call_insn 89 88 90 (parallel [
            (set (reg:SI 28 %r28)
                (call (mem:SI (symbol_ref/v:SI ("@memcpy") [flags 0x41] 
<function_decl 0x402abf00 memcpy>) [0 S4 A32])
                    (const_int 16 [0x10])))
            (clobber (reg:SI 1 %r1))
            (clobber (reg:SI 2 %r2))
            (use (const_int 0 [0]))
        ]) pr45722-2.c:48 -1
     (expr_list:REG_EH_REGION (const_int 0 [0])
        (nil))
    (expr_list:REG_DEP_TRUE (use (reg:SI 24 %r24))
        (expr_list:REG_DEP_TRUE (use (reg:SI 25 %r25))
            (expr_list:REG_DEP_TRUE (use (reg:SI 26 %r26))
                (nil)))))

(insn 90 89 0 (set (reg:SI 164)
        (reg:SI 28 %r28)) pr45722-2.c:48 -1
     (nil))

;; r_16 = fn3B (a_13);