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* [ARM][AArch64] Add CSDB speculation barrier instructionOliver Stannard2018-02-061-0/+4
This adds the CSDB instruction, which is a new barrier instruction described by the whitepaper at [1]. This is in encoding space which was previously executed as a NOP, so it is available for all targets that have the relevant NOP encoding space. This matches the binutils behaviour for these instructions [2][3]. [1] https://developer.arm.com/support/security-update [2] https://sourceware.org/ml/binutils/2018-01/msg00116.html [3] https://sourceware.org/ml/binutils/2018-01/msg00120.html llvm-svn: 324324
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