Compiler Errors on Do While loops

C51 compiler V6.23, at optimization levels of 7 or above generates crash code as shown in the listing below. The compiler PUSHes R1,R2,and R3 on the stack upon return from the function. When the Do While loop terminates, the function returns using the pushed value instead of the return address, in this case, a jump to location 0 causing a reset. Has anyone found a workaround or fix?

C51 COMPILER V6.23a, COMPILATION OF MODULE TEST
OBJECT MODULE PLACED IN Test.OBJ
COMPILER INVOKED BY: C:\SOFTUTIL\KEIL\C51\BIN\C51.EXE Test.c OPTIMIZE(9,SPEED) BROWSE DEBUG OBJECTEXTEND CODE
stmt level    source

   1          char * TestSomething();
   2          bit TestFunction(char *frame)
   3          {
   4   1          char temp;
   5   1          do
   6   1          {   
   7   2              temp = 0;
   8   2          }    
   9   1          while ((frame = TestSomething()) != 0);
  10   1          return (1);
  11   1      }
  12          
ASSEMBLY LISTING OF GENERATED OBJECT CODE
             ; FUNCTION _TestFunction (BEGIN)
                                           ; SOURCE LINE # 2
;---- Variable 'frame' assigned to Register 'R1/R2/R3' ----
                                           ; SOURCE LINE # 3
0000         ?C0003:
                                           ; SOURCE LINE # 6
                                           ; SOURCE LINE # 7
0000 E4                CLR     A
0001 F500        R     MOV     temp,A
                                           ; SOURCE LINE # 8
                                           ; SOURCE LINE # 9
0003 120000      E     LCALL   TestSomething
0006 C003              PUSH    AR3
0008 C002              PUSH    AR2
000A C001              PUSH    AR1
000C E9                MOV     A,R1
000D 4A                ORL     A,R2
000E 70F0              JNZ     ?C0003
                                           ; SOURCE LINE # 10
0010 D3                SETB    C
                                           ; SOURCE LINE # 11
0011         ?C0004:
0011 22                RET     
             ; FUNCTION _TestFunction (END)