[Issue 5364] optimizer kills high dword of -1

[d-bugmail at puremagic.com]

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



--- Comment #7 from Ellery Newcomer <ellery-newcomer at utulsa.edu> 2011-09-26 08:59:08 PDT ---
the compile:

~/Downloads/dmd2/linux/bin32/dmd pest -inline -O

the assembly dump:



08085344 <_D4pest1bFlZl>:
 8085344:       55                      push   ebp
 8085345:       8b ec                   mov    ebp,esp
 8085347:       8b 4d 0c                mov    ecx,DWORD PTR [ebp+0xc]
 808534a:       8b 44 24 08             mov    eax,DWORD PTR [esp+0x8]
 808534e:       85 c9                   test   ecx,ecx
 8085350:       7c 0d                   jl     808535f <_D4pest1bFlZl+0x1b>
 8085352:       7f 04                   jg     8085358 <_D4pest1bFlZl+0x14>
 8085354:       85 c0                   test   eax,eax
 8085356:       72 07                   jb     808535f <_D4pest1bFlZl+0x1b>
 8085358:       b8 ff ff ff ff          mov    eax,0xffffffff
 808535d:       31 c9                   xor    ecx,ecx
 808535f:       5d                      pop    ebp
 8085360:       8b d1                   mov    edx,ecx
 8085362:       c2 08 00                ret    0x8
 8085365:       90                      nop
 8085366:       90                      nop
 8085367:       90                      nop

08085368 <_Dmain>:
 8085368:       55                      push   ebp
 8085369:       8b ec                   mov    ebp,esp
 808536b:       6a 00                   push   0x0
 808536d:       6a 00                   push   0x0
 808536f:       e8 d0 ff ff ff          call   8085344 <_D4pest1bFlZl>
 8085374:       52                      push   edx
 8085375:       50                      push   eax
 8085376:       b8 84 67 0c 08          mov    eax,0x80c6784
 808537b:       6a 0a                   push   0xa
 808537d:       e8 22 00 00 00          call   80853a4
<_D3std5stdio4File14__T5writeTlTaZ5writeMFlaZv>
 8085382:       31 c0                   xor    eax,eax
 8085384:       5d                      pop    ebp
 8085385:       c3                      ret
 8085386:       90                      nop
 8085387:       90                      nop

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