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asm_x86.s
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asm_x86.s
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// +build amd64,go1.6
#include "textflag.h"
// func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
TEXT ·cpuid(SB), NOSPLIT, $0-24
MOVL eaxArg+0(FP), AX
MOVL ecxArg+4(FP), CX
CPUID
MOVL AX, eax+8(FP)
MOVL BX, ebx+12(FP)
MOVL CX, ecx+16(FP)
MOVL DX, edx+20(FP)
RET
// func EncodeInt(lat, lng float64) uint64
TEXT ·EncodeInt(SB), NOSPLIT, $0
CMPB ·useAsm(SB), $1
JNE fallback
#define LATF X0
#define LATI R8
#define LNGF X1
#define LNGI R9
#define TEMP R10
#define GHSH R11
#define MASK BX
MOVSD lat+0(FP), LATF
MOVSD lng+8(FP), LNGF
MOVQ $0x5555555555555555, MASK
MULSD $(0.005555555555555556), LATF
ADDSD $(1.5), LATF
MULSD $(0.002777777777777778), LNGF
ADDSD $(1.5), LNGF
MOVQ LNGF, LNGI
SHRQ $20, LNGI
MOVQ LATF, LATI
SHRQ $20, LATI
PDEPQ MASK, LATI, GHSH
PDEPQ MASK, LNGI, TEMP
SHLQ $1, TEMP
XORQ TEMP, GHSH
MOVQ GHSH, ret+16(FP)
RET
fallback:
JMP ·encodeInt(SB)