Displaying 3 results from an estimated 3 matches for "unreasonnable".
Did you mean:
unreasonable
2010 Oct 19
0
[LLVMdev] How to assign a constant to a register?
...ize into registers or not, as this is really dependent on the target's instruction set. Do we have any pass hoisting the constant loading out of the (inner) loops after isel ? I guess this could be beneficial for most targets --- assuming the pass does not increase the register pressure to some unreasonnable level.
--
Arnaud de Grandmaison
2010 Oct 19
1
[LLVMdev] How to assign a constant to a register?
...ize into registers or not, as this is really dependent on the target's instruction set. Do we have any pass hoisting the constant loading out of the (inner) loops after isel ? I guess this could be beneficial for most targets --- assuming the pass does not increase the register pressure to some unreasonnable level.
Yes; see lib/CodeGen/MachineLICM.cpp.
-Eli
2010 Oct 18
4
[LLVMdev] How to assign a constant to a register?
> let me say that in general doing this is pointless. Due to SSA form,
> if %x is
> set to 5 you can't set it to something else later. Thus everywhere
> that you
> use %x you might as well just directly use 5 there instead.
But the cost of doing that might be greater than the costs
of keeping it in a register. Suppose the code was ORing a value
with 5 and the target only had