stack frame optimization problem
sprucely
timberdig at gmail.com
Tue Oct 20 08:45:50 PDT 2009
This works with g++ and inline ATT assembly, but I have had no such luck in D. I have many simple functions that need to be executed sequentially and have identical stack frames. To avoid the overhead of setting up and tearing down the stack frames I want to jmp from the body of one function to the body of the next. A simplified example...
extern(C) byte jumpHere;
byte* jumpTo = &jumpHere;
void f1()
{
asm
{
//jmp dword ptr jumpTo;
mov EAX, jumpTo;
jmp EAX;
//jmp [EAX]
}
}
void f2()
{
asm{jumpHere:;}
}
No matter what I try I get a segfault. My assembly skills are very limited. I'm not using the naked keyword yet, because I want to get a proof-of-concept working first. Anyone see anything wrong with this? Any suggestions?
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