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Diffstat (limited to 'src/runtime/time_windows_arm64.s')
| -rw-r--r-- | src/runtime/time_windows_arm64.s | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/runtime/time_windows_arm64.s b/src/runtime/time_windows_arm64.s new file mode 100644 index 0000000..e0c7d28 --- /dev/null +++ b/src/runtime/time_windows_arm64.s @@ -0,0 +1,47 @@ +// 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. + +//go:build !faketime + +#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 + MOVD time_lo(R3), R0 + MOVD $100, R1 + MUL R1, R0 + MOVD R0, mono+16(FP) + + MOVD $_SYSTEM_TIME, R3 + MOVD time_lo(R3), R0 + // convert to Unix epoch (but still 100ns units) + #define delta 116444736000000000 + 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 % 1000000000) } + // + LSR $1, R0, R1 + MOVD $-8543223759426509416, R2 + UMULH R1, R2, R1 + LSR $28, R1, R1 + MOVD R1, sec+0(FP) + MOVD $1000000000, R2 + MSUB R1, R0, R2, R0 + MOVW R0, nsec+8(FP) + RET +useQPC: + B runtime·nowQPC(SB) // tail call + |