PowerPC e500 Core Family Reference Manual, Rev. 1
7-14 Freescale Semiconductor
Performance Monitor
Com:14 Finished unconditional branches
that miss the BTB
Spec Includes all taken branch instructions not allocated in the BTB
Com:15 Branches mispredicted (for any
reason)
Spec Counts branch instructions mispredicted due to direction, target (for
example if the CTR contents change), or IAB prediction. Does not
count instructions that the branch predictor incorrectly predicted to
be branches.
Com:16 Branches in the BTB mispredicted
due to direction prediction.
Spec Counts branch instructions mispredicted due to direction prediction.
Com:17 BTB hits and pseudo-hits Spec Branch instructions that hit in the BTB or miss in the BTB and are
not-taken (a pseudo-hit). Characterizes upper bound on prediction
rate.
Pipeline Stalls
Com:18 Cycles decode stalled Spec Cycles the IQ is not empty but 0 instructions decoded
Com:19 Cycles issue stalled Spec Cycles the issue buffer is not empty but 0 instructions issued
Com:20 Cycles branch issue stalled Spec Cycles the branch buffer is not empty but 0 instructions issued
Com:21 Cycles SU1 schedule stalled Spec Cycles SU1 is not empty but 0 instructions scheduled
Com:22 Cycles SU2 schedule stalled Spec Cycles SU2 is not empty but 0 instructions scheduled
Com:23 Cycles MU schedule stalled Spec Cycles MU is not empty but 0 instructions scheduled
Com:24 Cycles LRU schedule stalled Spec Cycles LRU is not empty but 0 instructions scheduled
Com:25 Cycles BU schedule stalled Spec Cycles BU is not empty but 0 instructions scheduled
Load/Store, Data Cache, and Data Line Fill Buffer (DLFB) Events
Com:26 Total translated Spec Total of load and store micro-ops that reach the second stage of the
LSU
1, 2
Com:27 Loads translated Spec Cacheable l* or evl* micro-ops translated. (includes load micro-ops
from load-multiple and load-update instructions)
1,2
Com:28 Stores translated Spec Cacheable st* or evst* micro-ops translated. (includes micro-ops
from store-multiple, and store-update instructions)
1,2
Com:29 Touches translated Spec Cacheable dcbt and dcbtst instructions translated (L1 only) (Doesn’t
count touches that are converted to nops i.e. exceptions,
noncacheable, HID0[NOPTI] is set.)
Com:30 Cacheops translated Spec dcba, dcbf, dcbst, and dcbz instructions translated.
Com:31 Cache-inhibited accesses
translated
Spec Cache inhibited accesses translated
Com:32 Guarded loads translated Spec Guarded loads translated
Com:33 Write-through stores translated Spec Write-through stores translated
Com:34 Misaligned load or store accesses
translated
Spec Misaligned load or store accesses translated.
Com:35 Total allocated to DLFB Spec —
Com:36 Loads translated and allocated to
DLFB
Spec Applies to same class of instructions as loads translated.
Table 7-10. Performance Monitor Event Selection (continued)
Number Event
Spec/
Nonspec
Count Description
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