[Issue 5364] optimizer kills high dword of -1

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5364



--- Comment #8 from Don <clugdbug at yahoo.com.au> 2011-10-15 16:03:33 PDT ---
Here's what it does on 32-bit Windows. The commented line is where the
difference is.

            mov     ECX,8[ESP]
            mov     EAX,4[ESP]
            test    ECX,ECX
            jl      Lsecond
            jg      Lfirst
            test    EAX,EAX
            jb      Lsecond
Lfirst:     mov     EAX,0xFFFFFFFF
            mov     ECX,EAX    // xor ECX, ECX on failing case
Lsecond:    mov     EDX,ECX
            ret     8

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