Andrew Trick 573931394f MI-Sched: handle latency of in-order operations with the new machine model. ... The per-operand machine model allows the target to define "unbuffered" processor resources. This change is a quick, cheap way to model stalls caused by the latency of operations that use such resources. This only applies when the processor's micro-op buffer size is non-zero (Out-of-Order). We can't precisely model in-order stalls during out-of-order execution, but this is an easy and effective heuristic. It benefits cortex-a9 scheduling when using the new machine model, which is not yet on by default. MI-Sched for armv7 was evaluated on Swift (and only not enabled because of a performance bug related to predication). However, we never evaluated Cortex-A9 performance on MI-Sched in its current form. This change adds MI-Sched functionality to reach performance goals on A9. The only remaining change is to allow MI-Sched to run as a PostRA pass. I evaluated performance using a set of options to estimate the performance impact once MI sched is default on armv7: -mcpu=cortex-a9 -disable-post-ra -misched-bench -scheditins=false For a simple saxpy loop I see a 1.7x speedup. Here are the llvm-testsuite results: (min run time over 2 runs, filtering tiny changes) Speedups: | Benchmarks/BenchmarkGame/recursive | 52.39% | | Benchmarks/VersaBench/beamformer | 20.80% | | Benchmarks/Misc/pi | 19.97% | | Benchmarks/Misc/mandel-2 | 19.95% | | SPEC/CFP2000/188.ammp | 18.72% | | Benchmarks/McCat/08-main/main | 18.58% | | Benchmarks/Misc-C++/Large/sphereflake | 18.46% | | Benchmarks/Olden/power | 17.11% | | Benchmarks/Misc-C++/mandel-text | 16.47% | | Benchmarks/Misc/oourafft | 15.94% | | Benchmarks/Misc/flops-7 | 14.99% | | Benchmarks/FreeBench/distray | 14.26% | | SPEC/CFP2006/470.lbm | 14.00% | | mediabench/mpeg2/mpeg2dec/mpeg2decode | 12.28% | | Benchmarks/SmallPT/smallpt | 10.36% | | Benchmarks/Misc-C++/Large/ray | 8.97% | | Benchmarks/Misc/fp-convert | 8.75% | | Benchmarks/Olden/perimeter | 7.10% | | Benchmarks/Bullet/bullet | 7.03% | | Benchmarks/Misc/mandel | 6.75% | | Benchmarks/Olden/voronoi | 6.26% | | Benchmarks/Misc/flops-8 | 5.77% | | Benchmarks/Misc/matmul_f64_4x4 | 5.19% | | Benchmarks/MiBench/security-rijndael | 5.15% | | Benchmarks/Misc/flops-6 | 5.10% | | Benchmarks/Olden/tsp | 4.46% | | Benchmarks/MiBench/consumer-lame | 4.28% | | Benchmarks/Misc/flops-5 | 4.27% | | Benchmarks/mafft/pairlocalalign | 4.19% | | Benchmarks/Misc/himenobmtxpa | 4.07% | | Benchmarks/Misc/lowercase | 4.06% | | SPEC/CFP2006/433.milc | 3.99% | | Benchmarks/tramp3d-v4 | 3.79% | | Benchmarks/FreeBench/pifft | 3.66% | | Benchmarks/Ptrdist/ks | 3.21% | | Benchmarks/Adobe-C++/loop_unroll | 3.12% | | SPEC/CINT2000/175.vpr | 3.12% | | Benchmarks/nbench | 2.98% | | SPEC/CFP2000/183.equake | 2.91% | | Benchmarks/Misc/perlin | 2.85% | | Benchmarks/Misc/flops-1 | 2.82% | | Benchmarks/Misc-C++-EH/spirit | 2.80% | | Benchmarks/Misc/flops-2 | 2.77% | | Benchmarks/NPB-serial/is | 2.42% | | Benchmarks/ASC_Sequoia/CrystalMk | 2.33% | | Benchmarks/BenchmarkGame/n-body | 2.28% | | Benchmarks/SciMark2-C/scimark2 | 2.27% | | Benchmarks/Olden/bh | 2.03% | | skidmarks10/skidmarks | 1.81% | | Benchmarks/Misc/flops | 1.72% | Slowdowns: | Benchmarks/llubenchmark/llu | -14.14% | | Benchmarks/Polybench/stencils/seidel-2d | -5.67% | | Benchmarks/Adobe-C++/functionobjects | -5.25% | | Benchmarks/Misc-C++/oopack_v1p8 | -5.00% | | Benchmarks/Shootout/hash | -2.35% | | Benchmarks/Prolangs-C++/ocean | -2.01% | | Benchmarks/Polybench/medley/floyd-warshall | -1.98% | | Polybench/linear-algebra/kernels/3mm | -1.95% | | Benchmarks/McCat/09-vor/vor | -1.68% | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196516 91177308-0d34-0410-b5e6-96231b3b80d8		2013-12-05 17:55:58 +00:00
..
Analysis
Assembler	Debug Info: update testing cases to specify the debug info version number.	2013-11-23 01:16:29 +00:00
Bindings	Update Ocaml/vmcore.ml to emit a "Debug Info Version" module flag.	2013-12-02 21:25:56 +00:00
Bitcode	Debug Info: drop debug info via upgrading path if version number does not match.	2013-12-02 21:29:56 +00:00
BugPoint	Debug Info: update testing cases to specify the debug info version number.	2013-11-23 01:16:29 +00:00
CodeGen	MI-Sched: handle latency of in-order operations with the new machine model.	2013-12-05 17:55:58 +00:00
DebugInfo	Make these two tests resilient in the face of compile unit size	2013-12-05 01:00:12 +00:00
ExecutionEngine	Fix lit config for disabled MCJIT tests on ARM	2013-12-03 13:48:28 +00:00
Feature	Debug Info: update testing cases to specify the debug info version number.	2013-11-23 01:16:29 +00:00
FileCheck
Instrumentation	[tsan] fix PR18146: sometimes a variable written into vptr could have an integer type (after other optimizations)	2013-12-05 15:03:02 +00:00
Integer
JitListener
Linker
LTO
MC	[mips][msa] Fix issue with immediate fields of LD/ST instructions	2013-12-05 11:06:22 +00:00
Object	Correct word hyphenations	2013-12-05 05:44:44 +00:00
Other
TableGen
tools	Un-revert r196358: "llvm-cov: Added support for function checksums."	2013-12-04 08:57:17 +00:00
Transforms	SLPVectorizer: An in-tree vectorized entry cannot also be a scalar external use	2013-12-05 15:14:40 +00:00
Unit
Verifier
YAMLParser
.clang-format
CMakeLists.txt	check-llvm: Ask llvm-config about assertion mode, instead of llc.	2013-12-03 23:22:25 +00:00
lit.cfg	check-llvm: Ask llvm-config about assertion mode, instead of llc.	2013-12-03 23:22:25 +00:00
lit.site.cfg.in
Makefile
Makefile.tests
TestRunner.sh