On 08/30/17 02:43, tip-bot for Josh Poimboeuf wrote: > > Those warnings are caused by an unusual GCC non-optimization where it > uses an intermediate register to adjust the stack pointer. It does: > > lea 0x8(%rsp), %rcx > ... > mov %rcx, %rsp > > Instead of the obvious: > > add $0x8, %rsp > > It makes no sense to use an intermediate register, so I opened a GCC bug > to track it: > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81813 > > But it's not exactly a high-priority bug and it looks like we'll be > stuck with this issue for a while. So for now we have to track register > values when they're loaded with stack pointer offsets. > This seems like a good reason to try to extract this information from the DWARF data *if available*? -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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