Oliver Stannard
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ee0ac39305
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[ARM][AArch64] Add CSDB speculation barrier instruction
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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2018-02-06 09:24:47 +00:00 |