6257ddba78
The big change is that the GeoJSON package has been completely rewritten to fix a few of geometry calculation bugs, increase performance, and to better follow the GeoJSON spec RFC 7946. GeoJSON updates - A LineString now requires at least two points. - All json members, even foreign, now persist with the object. - The bbox member persists too but is no longer used for geometry calculations. This is change in behavior. Previously Tile38 would treat the bbox as the object's physical rectangle. - Corrections to geometry intersects and within calculations. Faster spatial queries - The performance of Point-in-polygon and object intersect operations are greatly improved for complex polygons and line strings. It went from O(n) to roughly O(log n). - The same for all collection types with many children, including FeatureCollection, GeometryCollection, MultiPoint, MultiLineString, and MultiPolygon. Codebase changes - The pkg directory has been renamed to internal - The GeoJSON internal package has been moved to a seperate repo at https://github.com/tidwall/geojson. It's now vendored. Please look out for higher memory usage for datasets using complex shapes. A complex shape is one that has 64 or more points. For these shapes it's expected that there will be increase of least 54 bytes per point.
57 lines
925 B
ArmAsm
57 lines
925 B
ArmAsm
// +build amd64,go1.6
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#include "textflag.h"
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// func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
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TEXT ·cpuid(SB), NOSPLIT, $0-24
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MOVL eaxArg+0(FP), AX
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MOVL ecxArg+4(FP), CX
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CPUID
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MOVL AX, eax+8(FP)
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MOVL BX, ebx+12(FP)
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MOVL CX, ecx+16(FP)
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MOVL DX, edx+20(FP)
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RET
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// func EncodeInt(lat, lng float64) uint64
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TEXT ·EncodeInt(SB), NOSPLIT, $0
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CMPB ·useAsm(SB), $1
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JNE fallback
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#define LATF X0
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#define LATI R8
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#define LNGF X1
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#define LNGI R9
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#define TEMP R10
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#define GHSH R11
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#define MASK BX
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MOVSD lat+0(FP), LATF
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MOVSD lng+8(FP), LNGF
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MOVQ $0x5555555555555555, MASK
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MULSD $(0.005555555555555556), LATF
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ADDSD $(1.5), LATF
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MULSD $(0.002777777777777778), LNGF
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ADDSD $(1.5), LNGF
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MOVQ LNGF, LNGI
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SHRQ $20, LNGI
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MOVQ LATF, LATI
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SHRQ $20, LATI
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PDEPQ MASK, LATI, GHSH
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PDEPQ MASK, LNGI, TEMP
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SHLQ $1, TEMP
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XORQ TEMP, GHSH
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MOVQ GHSH, ret+16(FP)
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RET
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fallback:
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JMP ·encodeInt(SB)
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