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| author | Ian Lance Taylor <iant@golang.org> | 2021-04-27 16:04:56 -0700 |
|---|---|---|
| committer | Ian Lance Taylor <iant@golang.org> | 2021-04-28 20:16:36 +0000 |
| commit | b36596b14f8d3bee586479323c56b5db416a49e5 (patch) | |
| tree | 3a1c6f695e50e811844070decfc8b1e1d26e086b /src/runtime/time_windows_arm64.s | |
| parent | 07e006dd9322cc484303e1bef3d58c7e51d4f92c (diff) | |
| download | go-b36596b14f8d3bee586479323c56b5db416a49e5.tar.gz go-b36596b14f8d3bee586479323c56b5db416a49e5.zip | |
runtime: move Windows time.now implementations into separate files
This is a step toward separating whether time.now is implemented in
assembly from whether we are using faketime.
Change-Id: I8bf059b44a103b034835e3d3b799319cc05e9552
Reviewed-on: https://go-review.googlesource.com/c/go/+/314273
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Diffstat (limited to 'src/runtime/time_windows_arm64.s')
| -rw-r--r-- | src/runtime/time_windows_arm64.s | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/runtime/time_windows_arm64.s b/src/runtime/time_windows_arm64.s new file mode 100644 index 0000000000..61ce7577ce --- /dev/null +++ b/src/runtime/time_windows_arm64.s @@ -0,0 +1,64 @@ +// Copyright 2018 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. + +#include "go_asm.h" +#include "textflag.h" +#include "time_windows.h" + +TEXT time·now(SB),NOSPLIT|NOFRAME,$0-24 + MOVB runtime·useQPCTime(SB), R0 + CMP $0, R0 + BNE useQPC + MOVD $_INTERRUPT_TIME, R3 +loop: + MOVWU time_hi1(R3), R1 + MOVWU time_lo(R3), R0 + MOVWU time_hi2(R3), R2 + CMP R1, R2 + BNE loop + + // wintime = R1:R0, multiply by 100 + ORR R1<<32, R0 + MOVD $100, R1 + MUL R1, R0 + MOVD R0, mono+16(FP) + + MOVD $_SYSTEM_TIME, R3 +wall: + MOVWU time_hi1(R3), R1 + MOVWU time_lo(R3), R0 + MOVWU time_hi2(R3), R2 + CMP R1, R2 + BNE wall + + // w = R1:R0 in 100ns units + // convert to Unix epoch (but still 100ns units) + #define delta 116444736000000000 + ORR R1<<32, R0 + SUB $delta, R0 + + // Convert to nSec + MOVD $100, R1 + MUL R1, R0 + + // Code stolen from compiler output for: + // + // var x uint64 + // func f() (sec uint64, nsec uint32) { return x / 1000000000, uint32(x % 100000000) } + // + LSR $1, R0, R1 + MOVD $-8543223759426509416, R2 + UMULH R2, R1, R1 + LSR $28, R1, R1 + MOVD R1, sec+0(FP) + MOVD $-6067343680855748867, R1 + UMULH R0, R1, R1 + LSR $26, R1, R1 + MOVD $100000000, R2 + MSUB R1, R0, R2, R0 + MOVW R0, nsec+8(FP) + RET +useQPC: + B runtime·nowQPC(SB) // tail call + |