The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 2007
Filed:
Dec. 26, 2002
Richard A. Fuhler, Santa Cruz, CA (US);
Thomas J. Pennello, Santa Cruz, CA (US);
Michael Lee Jalkut, Santa Cruz, CA (US);
Peter Warnes, East Ham, GB;
Richard A. Fuhler, Santa Cruz, CA (US);
Thomas J. Pennello, Santa Cruz, CA (US);
Michael Lee Jalkut, Santa Cruz, CA (US);
Peter Warnes, East Ham, GB;
ARC International, St. Albans, GB;
Abstract
Methods and apparatus optimized for compiling instructions in a data processor are disclosed. In one aspect, a method of address calculation is disclosed, comprising operating a compiler to generate at least one instruction; canonicalizing the address calculation in a plurality of different approaches: in one exemplary embodiment, the first approach comprises canonicalizing the 'regular' 32-bit instruction addressing modes, and the second for the 'compressed' 16-bit instruction addressing modes. In another aspect, a plurality of functions (up to and including all available functions) are called indirectly to allow addresses to be placed in a constant pool. Improved methods for instruction selection, register allocation and spilling, and instruction compression are provided. An improved SoC integrated circuit device having an optimized 32-bit/16-bit processor core implementing at least one of the foregoing improvements is also disclosed.