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Arm - add speculation_barrier pattern 

This patch defines a speculation barrier for AArch32.

	* config/arm/unspecs.md (unspecv): Add VUNSPEC_SPECULATION_BARRIER.
	* config/arm/arm.md (speculation_barrier): New expand.
	(speculation_barrier_insn): New pattern.

From-SVN: r263169
This commit is contained in:
Richard Earnshaw 2018-07-31 17:35:41 +00:00 committed by Richard Earnshaw
parent 425fc685dd
commit bb8b009682
3 changed files with 28 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2018-07-31 Richard Earnshaw <rearnsha@arm.com>
* config/arm/unspecs.md (unspecv): Add VUNSPEC_SPECULATION_BARRIER.
* config/arm/arm.md (speculation_barrier): New expand.
(speculation_barrier_insn): New pattern.
2018-07-31 Richard Earnshaw <rearnsha@arm.com> 2018-07-31 Richard Earnshaw <rearnsha@arm.com>
* builtin-types.def (BT_FN_PTR_PTR_VAR): New function type. * builtin-types.def (BT_FN_PTR_PTR_VAR): New function type.

21
gcc/config/arm/arm.md
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@ -12012,6 +12012,27 @@
[(set_attr "length" "4") [(set_attr "length" "4")
(set_attr "type" "coproc")]) (set_attr "type" "coproc")])
(define_expand "speculation_barrier"
[(unspec_volatile [(const_int 0)] VUNSPEC_SPECULATION_BARRIER)]
"TARGET_EITHER"
"
/* Don't emit anything for Thumb1 and suppress the warning from the
generic expansion. */
if (!TARGET_32BIT)
DONE;
"
)
;; Generate a hard speculation barrier when we have not enabled speculation
;; tracking.
(define_insn "*speculation_barrier_insn"
[(unspec_volatile [(const_int 0)] VUNSPEC_SPECULATION_BARRIER)]
"TARGET_32BIT"
"isb\;dsb\\tsy"
[(set_attr "type" "block")
(set_attr "length" "8")]
)
;; Vector bits common to IWMMXT and Neon ;; Vector bits common to IWMMXT and Neon
(include "vec-common.md") (include "vec-common.md")
;; Load the Intel Wireless Multimedia Extension patterns ;; Load the Intel Wireless Multimedia Extension patterns

1
gcc/config/arm/unspecs.md
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@ -168,6 +168,7 @@
VUNSPEC_MCRR2 ; Represent the coprocessor mcrr2 instruction. VUNSPEC_MCRR2 ; Represent the coprocessor mcrr2 instruction.
VUNSPEC_MRRC ; Represent the coprocessor mrrc instruction. VUNSPEC_MRRC ; Represent the coprocessor mrrc instruction.
VUNSPEC_MRRC2 ; Represent the coprocessor mrrc2 instruction. VUNSPEC_MRRC2 ; Represent the coprocessor mrrc2 instruction.
VUNSPEC_SPECULATION_BARRIER ; Represents an unconditional speculation barrier.
]) ])
;; Enumerators for NEON unspecs. ;; Enumerators for NEON unspecs.