Invalid register operand when updating

The Open RISC 1000 architecture allows for a spectrum of chip and system implementations at a variety of price/performance points for a range of applications.It is a 32/64-bit load and store RISC architecture designed with emphasis on performance, simplicity, low power requirements, and scalability.Description Compares the single-precision floating-point values in the low doublewords of operand 1 (first operand) and operand 2 (second operand), and sets the ZF, PF, and CF flags in the EFLAGS register according to the result (unor-dered, greater than, less than, or equal).The OF, SF and AF flags in the EFLAGS register are set to 0.It is anticipated that revisions of the OR1K architecture will come about as architectural modifications are made over time.This document shall be valid for the latest version stated in it.The Open RISC 1000 architecture targets medium and high performance networking and embedded computer environments.This manual covers the instruction set, register set, cache management and coherency, memory model, exception model, addressing modes, operands conventions, and the application binary interface (ABI).

Note: and are reserved and must be 1111b, otherwise instructions will #UD. L=1 may encounter unpredictable behavior across different processor generations.A vectored transfer of control to supervisor software through an exception vector table.A way in which a processor can request operating system assistance (division by zero, TLB miss, external interrupt etc). Binary and other numbers are marked with their base.The full source for implementations of the Open RISC 1000 architecture is available at and is supported with GNU software development tools and a behavioral simulator.Most Open RISC implementations are designed to be modular and vendor-independent.Performance features include a full 32/64-bit architecture; vector, DSP and floating-point instructions; powerful virtual memory support; cache coherency; optional SMP and SMT support, and support for fast context switching.


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