[Issue 9722] optimizer kills GOT to EBX load

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http://d.puremagic.com/issues/show_bug.cgi?id=9722


Martin Nowak <code at dawg.eu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |


--- Comment #6 from Martin Nowak <code at dawg.eu> 2013-03-15 14:25:05 PDT ---
A slightly different case of the bug that still happens.
I haven't had time to reduce it yet though.

--------------------
dmd -c -m32 -fPIC -O druntime/src/core/runtime.d
--------------------
runModuleUnitTests PROC NEAR
        push    ebp                                     ; 0000 _ 55
        mov     ebp, esp                                ; 0001 _ 8B. EC
        sub     esp, 436                                ; 0003 _ 81. EC,
000001B4
        push    ebx                                     ; 0009 _ 53
        mov     ecx, 35                                 ; 000A _ B9, 00000023
        xor     eax, eax                                ; 000F _ 31. C0
        push    esi                                     ; 0011 _ 56
        push    edi                                     ; 0012 _ 57
        lea     edi, [ebp-1B4H]                         ; 0013 _ 8D. BD,
FFFFFE4C
        rep stosd                                       ; 0019 _ F3: AB
        lea     ecx, [ebp-1B0H]                         ; 001B _ 8D. 8D,
FFFFFE50
        push    ecx                                     ; 0021 _ 51
        mov     ebx, dword ptr [ebp-4H]                 ; 0022 _ 8B. 5D, FC
        call    sigfillset                              ; 0025 _ E8,
FFFFFFFC(PLT r)
...

The instruction that loads the GOT address from the stack is there but the part
that stores it on the stack has been optimized away.

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