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Sign extension is the operation, in computer arithmetic, of increasing the number of bits of a binary number while preserving the number's sign (positive/negative) and value. This is done by appending digits to the most significant side of the number, following a procedure dependent on the particular signed number representation used.
Streaming engine with short cut start instructions
A streaming engine employed in a digital data processor specifies a fixed read only data stream recalled memory. Streams are started by one of two types of stream start instructions. A stream start ordinary instruction specifies a register storing a stream start address and a register of storing a stream definition template which specifies stream parameters. A stream start short-cut instruction specifies a register storing a stream start address and an implied stream definition template. A functional unit is responsive to a stream operand instruction to receive at least one operand from a stream head register. The stream template supports plural nested loops with short-cut start instructions limited to a single loop. The stream template supports data element promotion to larger data element size with sign extension or zero extension. A set of allowed stream short-cut start instructions includes various data sizes and promotion factors.
Owner:TEXAS INSTRUMENTS INC