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AArch64 - add speculation barrier

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Similar to Arm, this adds an unconditional speculation barrier for AArch64.

	* config/aarch64.md (unspecv): Add UNSPECV_SPECULAION_BARRIER.
	(speculation_barrier): New insn.

From-SVN: r263170
This commit is contained in:
Richard Earnshaw 2018-07-31 17:35:50 +00:00 committed by Richard Earnshaw
parent bb8b009682
commit def745b2d3
2 changed files with 15 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2018-07-31 Richard Earnshaw <rearnsha@arm.com>
* config/aarch64.md (unspecv): Add UNSPECV_SPECULAION_BARRIER.
(speculation_barrier): New insn.
2018-07-31 Richard Earnshaw <rearnsha@arm.com>
* config/arm/unspecs.md (unspecv): Add VUNSPEC_SPECULATION_BARRIER.

10
gcc/config/aarch64/aarch64.md
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@ -205,6 +205,7 @@
UNSPECV_SET_FPSR ; Represent assign of FPSR content.
UNSPECV_BLOCKAGE ; Represent a blockage
UNSPECV_PROBE_STACK_RANGE ; Represent stack range probing.
UNSPECV_SPECULATION_BARRIER ; Represent speculation barrier.
]
)
@ -6554,6 +6555,15 @@
(match_operand 1))
(clobber (reg:CC CC_REGNUM))])])
;; Hard speculation barrier.
(define_insn "speculation_barrier"
[(unspec_volatile [(const_int 0)] UNSPECV_SPECULATION_BARRIER)]
""
"isb\;dsb\\tsy"
[(set_attr "length" "8")
(set_attr "type" "block")]
)
;; AdvSIMD Stuff
(include "aarch64-simd.md")