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On 06.09.2011 22:51, Rainer Schuetze wrote:
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On 06.09.2011 22:45, Walter Bright wrote:
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On 9/6/2011 12:13 PM, Rainer Schuetze wrote:
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<br>
I can reproduce the issue on Win7 64, but not on XP. I have
debugged it a little until I noticed that the generated code
for TLS access seems broken:<br>
<br>
dmd 2.054 generated this code for the append operation<br>
<br>
push 1 <br>
1000207D mov ecx,dword ptr [__tls_index (1006BF98h)]
<br>
10002083 mov edx,dword ptr fs:[2Ch] <br>
1000208A mov ebx,dword ptr [edx+ecx*4] <br>
1000208D lea esi,[ebx+4] <br>
10002093 push esi <br>
10002094 mov eax,offset TypeInfo_Ai@__init
(1005E9A0h) <br>
10002099 push eax <br>
1000209A call __d_arrayappendcT (10004D68h) <br>
<br>
while the beta generates<br>
<br>
push 1 <br>
10002076 mov ecx,dword ptr fs:[2Ch] <br>
1000207D mov edx,dword ptr [ecx] <br>
1000207F lea ebx,[edx+4] <br>
10002085 push ebx <br>
10002086 mov esi,offset TypeInfo_Ai@__init
(10067A90h) <br>
1000208B push esi <br>
1000208C call __d_arrayappendcT (10004F9Ch) <br>
<br>
so it completely ignores the tls_index. I guess it works on XP
because there are less DLLs that use TLS, so the DLLs index
ends up as 0.<br>
<br>
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<br>
Very interesting. Can you provide the source code for that?<br>
<br>
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</blockquote>
it seems to happen with any code:<br>
<br>
int x;<br>
<br>
int main()<br>
{<br>
return x;<br>
}<br>
<br>
generates<br>
<br>
__Dmain comdat<br>
assume CS:__Dmain<br>
mov EAX,FS:__tls_array<br>
mov ECX,[EAX]<br>
mov EAX,_D1m1xi[ECX]<br>
ret<br>
__Dmain ends<br>
<br>
</blockquote>
<br>
Sorry, this is wrong. This is the usual exe-only optimization that
assumes tls_index==0. It seems the command line options do not
suggest that a DLL is generated. I'll try to reduce it...<br>
<br>
<br>
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