[llvm-commits] [llvm] r106952 - in /llvm/trunk: include/llvm/CodeGen/ISDOpcodes.h include/llvm/CodeGen/SelectionDAG.h lib/CodeGen/SelectionDAG/LegalizeDAG.cpp lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp lib/CodeGen/SelectionDAG/SelectionDAG

[Duncan Sands]

Hi Rafael,

> Note that for example in the test I added we only align once with an
> "add r0, r0, 7; and r0, r0, -8". If both VAARG nodes had alignment
> information we would add an extra "add r0, r0, 3; and r0, r0, -4".

I'm more and more confused.  What is the definition of the alignment
argument?  Does a value of A mean: the memory the VAARG is reading
from is guaranteed to be aligned at least A?  That's what I had
understood.  But your example suggests it means something completely
different.  It sounds like a value of A means: this pointer may not
be aligned A, and must be forced to an alignment of A before doing
anything.  Can you please explain.

Ciao,

Duncan.