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2012 Feb 16
1
[LLVMdev] LLVM: MachineCopyPropagation.cpp
Hi,
I have the following code:
%a1<def> = COPY %a0<kill>
...
%a0h<def> = COPY %a1l
, as input to MachineCopyPropagation.
The second copy is illegally erased! This is wrong, because it is the low part of a1 that is copied to the high part of a0.
At a first glance, it seems that
if (!ReservedRegs.test(Def) &&
(!ReservedRegs.test(Src) || NoInterveningSideEffect(CopyMI, MI)) &&
(Sr...