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IRIX 6.2 Overview
The IRIX 6.2 release is the successor to both IRIX 5.3 and IRIX 6.1 and provides a common operating system across all SGI platforms running on R4000 (rev level 2.2) processors and above. It introduces the high performance 32-bit (N32) programming environment and continues support for both 64-bit virtual addressing and the MIPS R8000 processor. N32 is described in the N32 ABI Guide. A brief overview of the R8000 is provided below.
The R8000 processor has the following capabilities:
- Executes MIPS1 user code, compatible with the R3000.
- Executes MIPS2 instruction set extensions introduced in the R4000.
- Executes MIPS3 64-bit addressing and instructions introduced in the R4400.
- Integrates features for floating point performance improvements and integer improvements, which are called MIPS4 instructions.
The MIPS3 and MIPS4 64-bit capabilities provide both 64-bit virtual addressing and instructions which manipulate 64-bit integer data. Processor registers are 64 bits in size.
For more information about the R8000, please consult the MIPS R8000 Microprocessor User's Manual.
- IRIX 6.2 Objectives
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- What is Not in the IRIX 6.2 Release
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- Compatibility and Supported ABIs
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