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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-07-26 18:38:11 +0000 |
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| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-07-26 18:38:11 +0000 |
| commit | 9f63e104271eb91e545fa8cdb16fb9e10a8a9578 (patch) | |
| tree | 129292c1e42af3731aa15b38dec315b74795fed6 /lib/CodeGen/CMakeLists.txt | |
| parent | 27db99fcee85939f0b7580ad55303c4c60a3b98d (diff) | |
| download | llvm-9f63e104271eb91e545fa8cdb16fb9e10a8a9578.tar.gz llvm-9f63e104271eb91e545fa8cdb16fb9e10a8a9578.tar.bz2 llvm-9f63e104271eb91e545fa8cdb16fb9e10a8a9578.tar.xz | |
Start scaffolding for a MachineTraceMetrics analysis pass.
This is still a work in progress.
Out-of-order CPUs usually execute instructions from multiple basic
blocks simultaneously, so it is necessary to look at longer traces when
estimating the performance effects of code transformations.
The MachineTraceMetrics analysis will pick a typical trace through a
given basic block and provide performance metrics for the trace. Metrics
will include:
- Instruction count through the trace.
- Issue count per functional unit.
- Critical path length, and per-instruction 'slack'.
These metrics can be used to determine the performance limiting factor
when executing the trace, and how it will be affected by a code
transformation.
Initially, this will be used by the early if-conversion pass.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160796 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/CMakeLists.txt')
| -rw-r--r-- | lib/CodeGen/CMakeLists.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/CodeGen/CMakeLists.txt b/lib/CodeGen/CMakeLists.txt index d240389d7c..2e189ad7e7 100644 --- a/lib/CodeGen/CMakeLists.txt +++ b/lib/CodeGen/CMakeLists.txt @@ -61,6 +61,7 @@ add_llvm_library(LLVMCodeGen MachineSSAUpdater.cpp MachineScheduler.cpp MachineSink.cpp + MachineTraceMetrics.cpp MachineVerifier.cpp OcamlGC.cpp OptimizePHIs.cpp |