From: Cherry Zhang <cherryyz@google.com>
Date: Sat, 31 Oct 2020 21:21:40 +0000 (-0400)
Subject: runtime: use indexed load/store in ARM64 assembly
X-Git-Tag: go1.16beta1~356
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=202aa085abfc2aa7f3095102b9d47c83e177fb84;p=gostls13.git

runtime: use indexed load/store in ARM64 assembly

Minor optimization. Spotted while working on that code.

Change-Id: Ia02dee10d74bce79a0bef1eaba7fac1bfc27df38
Reviewed-on: https://go-review.googlesource.com/c/go/+/266899
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: fannie zhang <Fannie.Zhang@arm.com>
Reviewed-by: David Chase <drchase@google.com>
---

diff --git a/src/runtime/race_arm64.s b/src/runtime/race_arm64.s
index 5b1a1cb89a..6bc389f69f 100644
--- a/src/runtime/race_arm64.s
+++ b/src/runtime/race_arm64.s
@@ -38,8 +38,7 @@
 	MRS_TPIDR_R0 \
 	TP_ALIGN \
 	MOVD    runtime·tls_g(SB), R11 \
-	ADD     R11, R0 \
-	MOVD    0(R0), g
+	MOVD    (R0)(R11), g
 
 // func runtime·raceread(addr uintptr)
 // Called from instrumented code.
diff --git a/src/runtime/tls_arm64.s b/src/runtime/tls_arm64.s
index 701abae105..3f02974d5b 100644
--- a/src/runtime/tls_arm64.s
+++ b/src/runtime/tls_arm64.s
@@ -20,8 +20,7 @@ TEXT runtime·load_g(SB),NOSPLIT,$0
 	AND	$0xfffffffffffffff8, R0
 #endif
 	MOVD	runtime·tls_g(SB), R27
-	ADD	R27, R0
-	MOVD	0(R0), g
+	MOVD	(R0)(R27), g
 
 nocgo:
 	RET
@@ -38,8 +37,7 @@ TEXT runtime·save_g(SB),NOSPLIT,$0
 	AND	$0xfffffffffffffff8, R0
 #endif
 	MOVD	runtime·tls_g(SB), R27
-	ADD	R27, R0
-	MOVD	g, 0(R0)
+	MOVD	g, (R0)(R27)
 
 nocgo:
 	RET