diff options
| author | Andrea Di Biagio <Andrea_DiBiagio@sn.scee.net> | 2019-06-19 16:10:58 +0000 |
|---|---|---|
| committer | Andrea Di Biagio <Andrea_DiBiagio@sn.scee.net> | 2019-06-19 16:10:58 +0000 |
| commit | 792510f86949b9c14c2f26843f612e96ffbf82ec (patch) | |
| tree | 6289feb6f0ee782c109c13567990490f08350940 /llvm/docs/CommandGuide | |
| parent | 1f6ddfb6a359e8459d2fae8d7a908de03a727c05 (diff) | |
| download | bcm5719-llvm-792510f86949b9c14c2f26843f612e96ffbf82ec.tar.gz bcm5719-llvm-792510f86949b9c14c2f26843f612e96ffbf82ec.zip | |
[llvm-mca][docs] clarify how the quality of the perf report is affected by the quality of the scheduling models.
Differential Revision: https://reviews.llvm.org/D63556
llvm-svn: 363830
Diffstat (limited to 'llvm/docs/CommandGuide')
| -rw-r--r-- | llvm/docs/CommandGuide/llvm-mca.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/llvm/docs/CommandGuide/llvm-mca.rst b/llvm/docs/CommandGuide/llvm-mca.rst index d8c3b57207c..847a043fe7a 100644 --- a/llvm/docs/CommandGuide/llvm-mca.rst +++ b/llvm/docs/CommandGuide/llvm-mca.rst @@ -38,6 +38,17 @@ Or for Intel syntax: $ clang foo.c -O2 -target x86_64-unknown-unknown -mllvm -x86-asm-syntax=intel -S -o - | llvm-mca -mcpu=btver2 +Scheduling models are not just used to compute instruction latencies and +throughput, but also to understand what processor resources are available +and how to simulate them. + +By design, the quality of the analysis conducted by :program:`llvm-mca` is +inevitably affected by the quality of the scheduling models in LLVM. + +If you see that the performance report is not accurate for a processor, +please `file a bug <https://bugs.llvm.org/enter_bug.cgi?product=libraries>`_ +against the appropriate backend. + OPTIONS ------- |
