Metric Formats
The four possible formats for
the metrics that can appear on a line of annotated source code are explained
in Table 8–1.
Table 8–1 Annotated Source-Code Metrics
Metric
|
Significance
|
(Blank)
|
No PC in the program corresponds to this line of code. This case should
always apply to comment lines, and applies to apparent code lines in the following
circumstances:
-
All the instructions from the apparent piece of code have
been eliminated during optimization.
-
The code is repeated elsewhere, and the compiler performed
common subexpression recognition and tagged all the instructions with the
lines for the other copy.
-
The compiler tagged an instruction from that line with an
incorrect line number.
|
0.
|
Some PCs in the program were tagged as derived from this line, but no
data referred to those PCs: they were never in a call stack that was sampled
statistically or traced. The 0. metric does not indicate
that the line was not executed, only that it did not show up statistically
in a profiling data packet or a recorded tracing data packet.
|
0.000
|
At least one PC from this line appeared in the data, but the computed
metric value rounded to zero.
|
1.234
|
The metrics for all PCs attributed to this line added up to the non-zero
numerical value shown.
|