On 10/17/2010 4:49 PM, Ian S. Worthington wrote:
Hmmm. Seems to me that the advantages of the new instructions would have to be pretty dramatic to justify the additional testing time such a strategy would mandate.
Long displacements are supported on every machine that implements z/Architecture. The capability was retrofitted back to the z900 millicode when z990 came out. For the grande instructions, if the displacement is actually > 4K on those old machines then the instruction becomes a millicode instruction. Otherwise, it still runs in hardware. -- Edward E Jaffe Phoenix Software International, Inc 831 Parkview Drive North El Segundo, CA 90245 310-338-0400 x318 [email protected] http://www.phoenixsoftware.com/
