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Those registers are VFP/NEON and vector instructions should be used instead, but old cores rely on those co-processors to enable VFP unwinding. This change was prompted by the libc++abi's unwinding routine and is also present in many legacy low-level bare-metal code that we ought to compile/assemble. Fixing bug PR20025 and allowing PR20529 to proceed with a fix in libc++abi. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214802 91177308-0d34-0410-b5e6-96231b3b80d8
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