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runtime: use riscv64 RDTIME instruction

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Use the actual RDTIME instruction, rather than a WORD.
Generated code is the same.

Change-Id: I6f6f5a1836eae2d05af34d4a22db2ede4fdcb458
Reviewed-on: https://go-review.googlesource.com/c/go/+/231997
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Joel Sing 2020-05-05 03:15:58 +10:00
parent b6ad288032
commit cf9b4f63a5
1 changed files with 1 additions and 1 deletions
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2
src/runtime/asm_riscv64.s
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@ -79,7 +79,7 @@ TEXT setg_gcc<>(SB),NOSPLIT,$0-0
// func cputicks() int64
TEXT runtime·cputicks(SB),NOSPLIT,$0-8
WORD $0xc0102573 // rdtime a0
RDTIME A0
MOV A0, ret+0(FP)
RET