Invention Application
- Patent Title: TABLE LOOKUP USING SIMD INSTRUCTIONS
- Patent Title (中): 表使用SIMD指令
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Application No.: US14826199Application Date: 2015-08-14
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Publication No.: US20170046156A1Publication Date: 2017-02-16
- Inventor: Eric Wayne MAHURIN , Lucian CODRESCU , Erich James PLONDKE , David HOYLE , Mao ZENG , Kim-Chyan GAN
- Applicant: QUALCOMM Incorporated
- Main IPC: G06F9/30
- IPC: G06F9/30

Abstract:
Systems and methods pertain to looking up entries of a table. A processor receives one or more single instruction multiple data (SIMD) instructions, including a first SIMD instruction which specifies a first subset of indices. A first subset of table entries is looked up, using a crossbar, with the first subset of indices. A first vector output of the first SIMD instruction is based on whether the outputs of the crossbar belong to a desired subset of table entries. Similarly, second, third, and fourth SIMD instructions specify corresponding second, third, and fourth subsets of indices to lookup the remaining table entries using the crossbar. The size of the crossbar is based on the number of indices in the subset of indices used to lookup table entries.
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