- optimization.
Other new instructions: FCMOV, FCOMI/FCOMIP/FUCOMI/FUCOMIP,
RDPMC, UD2. New
instructions in
Pentium II
Deschutes core: MMX, FXSAVE, FXRSTOR...
-
Later processors removed this restriction.
RDPMC can be run
outside Ring 0 only if CR4.PCE=1. The
RDPMC instruction is not
present in VIA processors...
-
first processors to
implement such
counter and an ****ociated
instruction RDPMC to
access it was the
Intel Pentium, but they were not do****ented
until Terje...
- Performance-Monitoring
Counter enable If set,
RDPMC can be
executed at any
privilege level, else
RDPMC can only be used in ring 0. 9
OSFXSR Operating...
-
cmovpo cmovs cmovz cpuid fcmov floating point conditional move
fcomi nopl
rdpmc read
performance monitor counts rdtsc read time
stamp counter syscall sysenter...
- path. [...] High-precision
internal CPU counters, such as RDTSC, RDMSR,
RDPMC [omitted: long
lists of low-level
system information fields and performance...
