[llvm-mca][scheduler-stats] Print issued micro opcodes per cycle. NFCI

It makes more sense to print out the number of micro opcodes that are issued
every cycle rather than the number of instructions

[llvm-mca][scheduler-stats] Print issued micro opcodes per cycle. NFCI

It makes more sense to print out the number of micro opcodes that are issued
every cycle rather than the number of instructions issued per cycle.
This behavior is also consistent with the dispatch-stats: numbers from the two
views can now be easily compared.

llvm-svn: 357919

show more ...

[llvm-mca] Add fields "Total uOps" and "uOps Per Cycle" to the report generated by the SummaryView.

This patch adds two new fields to the perf report generated by the SummaryView.
Fields are now log

[llvm-mca] Add fields "Total uOps" and "uOps Per Cycle" to the report generated by the SummaryView.

This patch adds two new fields to the perf report generated by the SummaryView.
Fields are now logically organized into two small groups; only the second group
contains throughput indicators.

Example:
```
Iterations: 100
Instructions: 300
Total Cycles: 414
Total uOps: 700

Dispatch Width: 4
uOps Per Cycle: 1.69
IPC: 0.72
Block RThroughput: 4.0
```

This patch also updates the docs for llvm-mca.
Due to the nature of this change, several tests in the tools/llvm-mca directory
were affected, and had to be updated using script `update_mca_test_checks.py`.

llvm-svn: 340946

show more ...

[llvm-mca] Improved report generated by the SchedulerStatistics view.

Before this patch, the SchedulerStatistics only printed the maximum number of
buffer entries consumed in each scheduler's queue

[llvm-mca] Improved report generated by the SchedulerStatistics view.

Before this patch, the SchedulerStatistics only printed the maximum number of
buffer entries consumed in each scheduler's queue at a given point of the
simulation.

This patch restructures the reported table, and adds an extra field named
"Average number of used buffer entries" to it.
This patch also uses different colors to help identifying bottlenecks caused by
high scheduler's buffer pressure.

llvm-svn: 340746

show more ...

[llvm-mca] Use a different character to flag instructions with side-effects in the Instruction Info View. NFC

This makes easier to identify changes in the instruction info flags. It also
helps spot

[llvm-mca] Use a different character to flag instructions with side-effects in the Instruction Info View. NFC

This makes easier to identify changes in the instruction info flags. It also
helps spotting potential regressions similar to the one recently introduced at
r336728.

Using the same character to mark MayLoad/MayStore/HasSideEffects is problematic
for llvm-lit. When pattern matching substrings, llvm-lit consumes tabs and
spaces. A change in position of the flag marker may not trigger a test failure.

This patch only changes the character used for flag `hasSideEffects`. The reason
why I didn't touch other flags is because I want to avoid spamming the mailing
because of the massive diff due to the numerous tests affected by this change.

In future, each instruction flag should be associated with a different character
in the Instruction Info View.

llvm-svn: 336797

show more ...

[llvm-mca] Make sure not to end the test files with an empty line.

Summary:
It's super irritating.

[properly configured] git client then complains about that double-newline,
and you have to use `--

[llvm-mca] Make sure not to end the test files with an empty line.

Summary:
It's super irritating.

[properly configured] git client then complains about that double-newline,
and you have to use `--force` to ignore the warning, since even if you
fix it manually, it will be reintroduced the very next runtime :/

Reviewers: RKSimon, andreadb, courbet, craig.topper, javed.absar, gbedwell

Reviewed By: gbedwell

Subscribers: javed.absar, tschuett, gbedwell, llvm-commits

Differential Revision: https://reviews.llvm.org/D47697

llvm-svn: 333887

show more ...

[llvm-mca] Print the "Block RThroughput" in the SummaryView.

This patch implements the "block reciprocal throughput" computation in the
SummaryView.

The block reciprocal throughput is computed as t

[llvm-mca] Print the "Block RThroughput" in the SummaryView.

This patch implements the "block reciprocal throughput" computation in the
SummaryView.

The block reciprocal throughput is computed as the MAX of:
- NumMicroOps / DispatchWidth
- Resource Cycles / #Units (for every resource consumed).

The block throughput is bounded from above by the hardware dispatch throughput.
That is because the DispatchWidth is an upper bound on how many opcodes can be part
of a single dispatch group.

The block throughput is also limited by the amount of hardware parallelism. The
number of available resource units affects how the resource pressure is
distributed, and also how many blocks can be delivered every cycle.

llvm-svn: 333095

show more ...

[llvm-mca] Regenerate tests after r332381 and r332361. NFC

llvm-svn: 332447

[UpdateTestChecks] Add update_mca_test_checks.py script

This script can be used to regenerate tests in the
test/tools/llvm-mca directory (PR36904).

Regenerated a number of tests using the pattern:

[UpdateTestChecks] Add update_mca_test_checks.py script

This script can be used to regenerate tests in the
test/tools/llvm-mca directory (PR36904).

Regenerated a number of tests using the pattern: test/tools/llvm-mca/*/*/*.s

Differential Revision: https://reviews.llvm.org/D45369

llvm-svn: 330246

show more ...

[llvm-mca] Move the logic that prints scheduler statistics from BackendStatistics to its own view.

Added flag -scheduler-stats to print scheduler related statistics.

llvm-svn: 329792

[X86][Btver2] Correctly distinguish between scheduling pipe and functional unit for JWriteResFpuPair defs

Jaguar's FPU has 2 scheduler pipes (JFPU0/JFPU1) which forward to multiple functional sub-un

[X86][Btver2] Correctly distinguish between scheduling pipe and functional unit for JWriteResFpuPair defs

Jaguar's FPU has 2 scheduler pipes (JFPU0/JFPU1) which forward to multiple functional sub-units each. We need to model that an micro-op will both consume the scheduler pipe and a functional unit.

This patch just handles the ops defined through JWriteResFpuPair, I'll go through the custom cases later.

llvm-svn: 327791

show more ...

[llvm-mca] BackendStatistics: early exit from method printSchedulerUsage if the
no scheduler resources were consumed.

llvm-svn: 327215