Preserving the content of a first register without affecting the content of a second register

   
   

Techniques are disclosed for preserving first content in a first register. In one embodiment, the first register is a general register, a second register is a UNaT register, and each general register is associated with a NaT bit. To preserve the content of the UNaT register while saving the content of a general register and its associated NaT bit, the content of the general register is saved to a floating-point register, and the NaT bit associated with the general register is also saved. If the NaT bit is set, then only the NaT bit is restored. Conversely, if the NaT bit is not set, then both the content of the general register and the NaT bit are restored.

As técnicas são divulgadas para preservar o primeiro índice em um primeiro registo. Em uma incorporação, o primeiro registo é um registo geral, um segundo registo é um registo de UNaT, e cada registo geral é associado com um bocado naT. Para preservar o índice do UNaT registe ao conservar o índice de um registo geral e de seu bocado naT associado, o índice do registo geral é conservado a um registo floating-point, e o bocado naT associado com o registo geral está conservado também. Se o bocado naT for ajustado, a seguir somente o bocado naT está restaurado. Inversamente, se o bocado naT não for ajustado, então o índice do registo geral e o bocado naT são restaurados.

 
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