search for: issubregist

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2010 Apr 21
2
[LLVMdev] On the transitivity of subregisterness
Woud it be reasonable to assert that TargetRegisterInfo::isSubRegister() is a transitive relation? In other words, if A is a subregister of B and B is a subregister of C then A is a subregister of C. With this assumption, we could teach TableGen to sort registers topologically such that all the subregisters of R are numbered R+1, R+2, ... This produces better loca...
2012 Feb 16
1
[LLVMdev] LLVM: MachineCopyPropagation.cpp
...py 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)) && (SrcSrc == Def || TRI->isSubRegister(SrcSrc, Def))) { ... (erase COPY) , should be extended to ... (SrcSrc == Def || (TRI->isSubRegister(SrcSrc, Def) && isMatchingSubRegIdx(%a0, %a0h, %a1, %a1l)))) { , where isMatchingSubRegIdx (or whatever) should make sure that this type of subreg motion is not...