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This intrinsic permits the emission of platform specific undefined sequences. ARM has reserved the 0xde opcode which takes a single integer parameter (ignored by the CPU). This permits the operating system to implement custom behaviour on this trap. The llvm.arm.undefined intrinsic is meant to provide a means for generating the target specific behaviour from the frontend. This is particularly useful for Windows on ARM which has made use of a series of these special opcodes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209390 91177308-0d34-0410-b5e6-96231b3b80d8 |
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