From: Meng Zhuo <mzh@golangcn.org>
Date: Tue, 6 Jul 2021 07:17:07 +0000 (+0000)
Subject: runtime: use RDCYCLE for cputicks on riscv64
X-Git-Tag: go1.18beta1~1721
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=946e2543f878929752da9d16575dd5e96ac78532;p=gostls13.git

runtime: use RDCYCLE for cputicks on riscv64

Use RDCYCLE instruction instead of RDTIME emulation

Change-Id: Id7b3de42a36d2d1b163c39cc79870eee7c840ad5
Reviewed-on: https://go-review.googlesource.com/c/go/+/332954
Trust: Meng Zhuo <mzh@golangcn.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
---

diff --git a/src/runtime/asm_riscv64.s b/src/runtime/asm_riscv64.s
index d7ab90d1ab..531b46927c 100644
--- a/src/runtime/asm_riscv64.s
+++ b/src/runtime/asm_riscv64.s
@@ -81,7 +81,7 @@ TEXT setg_gcc<>(SB),NOSPLIT,$0-0
 
 // func cputicks() int64
 TEXT runtime·cputicks(SB),NOSPLIT,$0-8
-	RDTIME	A0
+	RDCYCLE	A0
 	MOV	A0, ret+0(FP)
 	RET