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2007 Oct 04
0
[LLVMdev] RFC: Tail call optimization X86
...testing with
LLCBETAOPTION := -tail-call-opt -tail-call-opt-align-stack
> Please remove -regalloc=local -fast. We want to test this patch
> separately. Can you explain the advantages / disadvantages of -tail-
> call-opt-align-stack?
When you do tail call optimization just before calling/jmping to the
callee you sometimes have to adjust the stack pointer.
e.g
int calller(int arg1, int arg2)
{
return callee(arg2, arg1, 2*arg3;
}
conceptually before jumping to callee the stackpointer has to be
adjusted (by -4 bytes in the example). Now this can cause the stack to
be misaligned (accordin...
2007 Oct 03
4
[LLVMdev] RFC: Tail call optimization X86
On Oct 2, 2007, at 2:27 AM, Arnold Schwaighofer wrote:
> Hi all,
>
> I changed the code that checks whether a tail call is really
> eligible for optimization so that it performs the check/fix in
> SelectionDAGISel.cpp:BuildSelectionDAG() as suggest by Evan. Also
> eliminated an error that caused the remaining failing test cases in
> the test-suite.
>
> The