Pack/Unpack

Overview

Pack/unpack operations convert between two representations of vector types.

Vector packing operations
These intrinsics perform saturation based on the control register here: Control Register. Rounding is not done. No status flags are updated. Parameters v The input vector
v32int8	pack (v32int16 v)
v32uint8	pack (v32uint16 v)
v64int4	pack (v64int8 v)
v64uint4	pack (v64uint8 v)

Vector unpacking operations
Parameters v The input vector
v32int16	unpack (v32int8 v)
v32uint16	unpack (v32uint8 v)
v64int8	unpack (v64int4 v)
v64uint8	unpack (v64uint4 v)

Vector packing operations (dynamic sign)
These intrinsics perform saturation based on the control register here: Control Register. Rounding is not done. No status flags are updated. The sign argument affects the extension the elements in the vector. For instance, in pseudo-code: v = {0b0000000011111111, ...} assert pack(v, true)[0] == 0b01111111 assert pack(v, false)[0] == 0b11111111 # Reasoning: # v is signed 255, truncating will result in -128 so the top bit is truncated to give INT_MAX for 8b (127) == 0b01111111 # v is unsigned so just truncate and saturate the value == 0b11111111 Parameters v The input vector sign indicates the sign of the pack conversion
v32int8	pack (v32int16 v, int sign)
v32uint8	pack (v32uint16 v, int sign)
v64int4	pack (v64int8 v, int sign)
v64uint4	pack (v64uint8 v, int sign)

Vector unpacking operations (dynamic sign)
These intrinsics perform saturation based on the control register here: Control Register. Rounding is not done. No status flags are updated. The sign argument affects the extension the elements in the vector. For instance, in pseudo-code: v = {0b11111111, ...} assert unpack(v, true)[0] == 0b1111111111111111 assert unpack(v, false)[0] == 0b0000000011111111 # Reasoning: # true means v is signed so -1_8b should extend to -1_16b == 0b1111111111111111 # false means v is unsigned so 0b11111111 is 255_8b and should stay 255 in 16b == 0b0000000011111111 Parameters v The input vector sign indicates the sign of the pack conversion
v32int16	unpack (v32int8 v, uint1_t sign)
v32uint16	unpack (v32uint8 v, uint1_t sign)
v64int8	unpack (v64int4 v, uint1_t sign)
v64uint8	unpack (v64uint4 v, uint1_t sign)

Function Documentation

pack() [1/8]

v32int8 pack

(

v32int16

v

)

pack() [2/8]

v32int8 pack	(	v32int16	v,
		int	sign
	)

pack() [3/8]

v32uint8 pack

(

v32uint16

v

)

pack() [4/8]

v32uint8 pack	(	v32uint16	v,
		int	sign
	)

pack() [5/8]

v64int4 pack

(

v64int8

v

)

pack() [6/8]

v64int4 pack	(	v64int8	v,
		int	sign
	)

pack() [7/8]

v64uint4 pack

(

v64uint8

v

)

pack() [8/8]

v64uint4 pack	(	v64uint8	v,
		int	sign
	)

unpack() [1/8]

v32int16 unpack

(

v32int8

v

)

unpack() [2/8]

v32int16 unpack	(	v32int8	v,
		uint1_t	sign
	)

unpack() [3/8]

v32uint16 unpack

(

v32uint8

v

)

unpack() [4/8]

v32uint16 unpack	(	v32uint8	v,
		uint1_t	sign
	)

unpack() [5/8]

v64int8 unpack

(

v64int4

v

)

unpack() [6/8]

v64int8 unpack	(	v64int4	v,
		uint1_t	sign
	)

unpack() [7/8]

v64uint8 unpack

(

v64uint4

v

)

unpack() [8/8]

v64uint8 unpack	(	v64uint4	v,
		uint1_t	sign
	)