HP Caliper User's Guide

fp Event Set
The fp event set provides information relating to floating-point operation density,
execution rate, and flush/trap events density.
If you use this event set, the default is to make the measurements irrespective of CPU
operating state (that is, user, system, or interrupt states). By default, the idle state is
not included in the measurement. You can use command-line options to limit the scope
of the measurement. Specifically, you can:
• Limit measurement to a specific privilege level: -m
event_set[:all|user|kernel]
• Include idle: --exclude-idle False
• Exclude the interruption state: --measure-on-interrupts off
• Only measure the interruption state: --measure-on-interrupts only
The event per kinst (event per 1000 instructions) metrics are computed using all
instructions retired. This includes nops, predicated off instructions, failed speculation
and instructions and associated recovery code as well as the architecturally visible
instruction. You can eliminate idle loops effects by using the command-line option
--exclude-idle True (which is the default). The effects of failed speculative
operations and TLB misses cannot be directly eliminated, but you can get an estimate
of the impact of events from the cspec, dspec, and tlb event sets. You can use the
cpi event set to obtain the fraction of all instructions retired that have an architecturally
visible result, except for predicated off branches, which are counted as useful instructions
(non-taken branch) by the Itanium 2 PMU.
Correspondence Between Floating-Point Instructions and Operations
In interpreting this information, it is important to realize that there is not necessarily
a 1-to-1 correspondence between floating-point instructions and floating-point
operations and floating-point as counted by the performance monitoring unit (PMU).
The following list shows instruction, the operation, and the number of operations
corresponding to the instruction:
FNORM
Floating-Point Normalize: 1 operation
FADD
Floating-Point Add: 1 operation
FMA
Floating-Point Multiply Add: 2 operations
FMS
Floating-Point Multiply Subtract: 2 operations
FSUB
Floating-Point Subtract: 1 operation
FMPY
Floating-Point Multiply: 1 operation
FMIN
Floating-Point Minimum: 1 operation
FAMIN
Floating-Point Absolute Minimum: 1 operation
FMAX
Floating-Point Maximum: 1 operation
FAMAX
Floating-Point Absolute Maximum: 1 operation
FCMP
Floating-Point Compare: 1 operation
fp Event Set 317