diff options
Diffstat (limited to 'src/runtime/time_windows_arm64.s')
| -rw-r--r-- | src/runtime/time_windows_arm64.s | 31 |
1 files changed, 6 insertions, 25 deletions
diff --git a/src/runtime/time_windows_arm64.s b/src/runtime/time_windows_arm64.s index ef52ce4c99..ef5b848473 100644 --- a/src/runtime/time_windows_arm64.s +++ b/src/runtime/time_windows_arm64.s @@ -13,34 +13,18 @@ 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 $_INTERRUPT_TIME, R3 + MOVD time_lo(R3), 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 + MOVD time_lo(R3), R0 // 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 @@ -48,17 +32,14 @@ wall: // Code stolen from compiler output for: // // var x uint64 - // func f() (sec uint64, nsec uint32) { return x / 1000000000, uint32(x % 100000000) } + // func f() (sec uint64, nsec uint32) { return x / 1000000000, uint32(x % 1000000000) } // LSR $1, R0, R1 MOVD $-8543223759426509416, R2 - UMULH R2, R1, R1 + UMULH R1, R2, R1 LSR $28, R1, R1 MOVD R1, sec+0(FP) - MOVD $-6067343680855748867, R1 - UMULH R0, R1, R1 - LSR $26, R1, R1 - MOVD $100000000, R2 + MOVD $1000000000, R2 MSUB R1, R0, R2, R0 MOVW R0, nsec+8(FP) RET |