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How to turn off spontaneous deferral on Itanium?
Hi,
I'm a graduate student developing JAVA JIT compiler on Itanium. Working with Itanium, I got a problem with speculative loads and needs your kind help to get out of it. Here's my situation, I'm trying to use the "speculative load" feature of IA64 for performance. But I found speculative loads sometimes mark target register with NaT bits even if all the conditions are successful. I suspect the reason for the unexpected deferrals is "spontaneous deferral". According to "Intel Itanium architecture software developer's manual (revision 2.1)", "In addition to the deferral of exceptional conditions, speculative loads may be deferred automatically by hardware based on implementation-dependent criteria, such as the detection of a cache miss. Such deferral is referred to as 'spontaneous deferral', and is done in order to increase performance"(volume 2, section 5.5.5 "deferral of speculative load faults") I wonder spontaneous deferral is turned on by default on Itanium. If so, I wanna know how to turn it off or bypass it. (I found several options on the manual to turn the spontaneous deferral off, but they all required system privilege. Your kind help will be GREATLY appreciated. Thanks in advance. |
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