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cmd/internal/obj/arm64: add NOOP description in Go assembly syntax

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This Patch describes NOOP in Go assembly syntax and gives Go assembly
example and corresponding GNU assembly example.

Change-Id: I9db659cc5e3dc6b1f1450f2064255af8872d4b1c
Reviewed-on: https://go-review.googlesource.com/c/go/+/207400
Run-TryBot: eric fang <eric.fang@arm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
diaxu01 2019-10-25 06:19:23 +00:00 committed by Cherry Zhang
parent 9940c77682
commit 01f15b62b3
1 changed files with 5 additions and 0 deletions
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src/cmd/internal/obj/arm64/doc.go
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@ -53,12 +53,17 @@ Special Cases.
(3) No need to add "W" suffix: LDARB, LDARH, LDAXRB, LDAXRH, LDTRH, LDXRB, LDXRH. (3) No need to add "W" suffix: LDARB, LDARH, LDAXRB, LDAXRH, LDTRH, LDXRB, LDXRH.
(4) In Go assembly syntax, NOP is a zero-width pseudo-instruction serves generic purpose, nothing
related to real ARM64 instruction. NOOP serves for the hardware nop instruction. NOOP is an alias of
HINT $0.
Examples: Examples:
VMOV V13.B[1], R20 <=> mov x20, v13.b[1] VMOV V13.B[1], R20 <=> mov x20, v13.b[1]
VMOV V13.H[1], R20 <=> mov w20, v13.h[1] VMOV V13.H[1], R20 <=> mov w20, v13.h[1]
JMP (R3) <=> br x3 JMP (R3) <=> br x3
CALL (R17) <=> blr x17 CALL (R17) <=> blr x17
LDAXRB (R19), R16 <=> ldaxrb w16, [x19] LDAXRB (R19), R16 <=> ldaxrb w16, [x19]
NOOP <=> nop
Register mapping rules Register mapping rules