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Hi Gordon, You're talking about Thumb mode code here, right? As I understand it, the ARM mode MOV instruction is valid for everything ARMv4 and up. (nit picky side note: CPY is an obsolete mnemonic as of the introduction of unified syntax) Assuming so, using a high register causes headaches, as R8+ are call preserved registers, and the Thumb push/pop instructions can't reference them.

Hi, I've been thinking about ways to get around this in the short term for some time, http://llvm.org/bugs/show_bug.cgi?id=1388 An end-user workaround is possibly to use at least one register > r7 for the MOV form of the instruction. In that case, what is listed in the bug as the CPY instruction (which is the ARMv6 version generated if both Rd and Rm are <= r7) will become a valid MOV