1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !faketime
// +build !faketime
#include "go_asm.h"
#include "textflag.h"
#include "time_windows.h"
TEXT time·now(SB),NOSPLIT,$0-24
CMPB runtime·useQPCTime(SB), $0
JNE useQPC
MOVQ $_INTERRUPT_TIME, DI
MOVQ time_lo(DI), AX
IMULQ $100, AX
MOVQ AX, mono+16(FP)
MOVQ $_SYSTEM_TIME, DI
MOVQ time_lo(DI), AX
MOVQ $116444736000000000, DI
SUBQ DI, AX
IMULQ $100, AX
// generated code for
// func f(x uint64) (uint64, uint64) { return x/1000000000, x%1000000000 }
// adapted to reduce duplication
MOVQ AX, CX
MOVQ $1360296554856532783, AX
MULQ CX
ADDQ CX, DX
RCRQ $1, DX
SHRQ $29, DX
MOVQ DX, sec+0(FP)
IMULQ $1000000000, DX
SUBQ DX, CX
MOVL CX, nsec+8(FP)
RET
useQPC:
JMP runtime·nowQPC(SB)
RET
|
