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While filter is similar to Compress, some extensions to the [[wikipedia:x86|x86]] instruction set are exactly equivalent to Compress on particular data types. In [[wikipedia:BMI2|BMI2]], the PEXT and PDEP instructions (parallel bit extract and deposit) are identical to Compress and [[Expand]] on the bits of a register argument. Indeed, [[Dyalog APL]] uses these instructions to implement those primitives (see [[Dyalog APL#Instruction set usage]]). The [[wikipedia:AVX-512|AVX-512]] instructions VPCOMPRESSQ and VPEXPANDQ (and variations) are not only equivalent to Compress and Expand using a mask register for the [[Boolean]] argument and a vector register for the other argument, but are named after the APL functions. These instructions allow compression of 4-byte and 8-byte elements, and with AVX-512_VBMI2 support was added for 1-byte and 2-byte elements as well. | While filter is similar to Compress, some extensions to the [[wikipedia:x86|x86]] instruction set are exactly equivalent to Compress on particular data types. In [[wikipedia:BMI2|BMI2]], the PEXT and PDEP instructions (parallel bit extract and deposit) are identical to Compress and [[Expand]] on the bits of a register argument. Indeed, [[Dyalog APL]] uses these instructions to implement those primitives (see [[Dyalog APL#Instruction set usage]]). The [[wikipedia:AVX-512|AVX-512]] instructions VPCOMPRESSQ and VPEXPANDQ (and variations) are not only equivalent to Compress and Expand using a mask register for the [[Boolean]] argument and a vector register for the other argument, but are named after the APL functions. These instructions allow compression of 4-byte and 8-byte elements, and with AVX-512_VBMI2 support was added for 1-byte and 2-byte elements as well. | ||
== See also == | |||
* [[Reshape]] | |||
== External Links == | == External Links == | ||