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bab06ba696
This patch matches GCC behavior: the code used to only allow unaligned load/store on ARM for v6+ Darwin, it will now allow unaligned load/store for v6+ Darwin as well as for v7+ on Linux and NaCl. The distinction is made because v6 doesn't guarantee support (but LLVM assumes that Apple controls hardware+kernel and therefore have conformant v6 CPUs), whereas v7 does provide this guarantee (and Linux/NaCl behave sanely). The patch keeps the -arm-strict-align command line option, and adds -arm-no-strict-align. They behave similarly to GCC's -mstrict-align and -mnostrict-align. I originally encountered this discrepancy in FastIsel tests which expect unaligned load/store generation. Overall this should slightly improve performance in most cases because of reduced I$ pressure. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182175 91177308-0d34-0410-b5e6-96231b3b80d8
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