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...ens with architectures, where stack alignment is smaller than the biggest preferred alignment for any data type SP pointer may point anywhere with alignment of stack alignment (4 in our case) SelectionDAGBuilder however calls CreateStackObject with preferred alignment is given data type(8 in our problemaric case. The ABI alignment for this data type is only 4) This means, that the MachineFrameInfo thinks that the stack object is aligned by 8 bytes, even though in reality if may also be aligned only by 4 bytes, of the SP points to address which is aligned by 4, but not 8. r125471 introduced optimiza...