LLVM-Clang On Ubuntu Linux ARM

Comparing GCC 4.7.0 and LLVM-Clang 3.0 from Ubuntu repository on Ubuntu 12.10 daily snapshot from 5 June 2012. Testing for a future article on Phoronix.com. The CFLAGS/CXXFLAGS passed to each compiler were -O3 and -march=armv7-a.

Compare your own system(s) to this result file with the Phoronix Test Suite by running the command: phoronix-test-suite benchmark 1206060-SU-LLVMCLANG78
Jump To Table - Results

View

Do Not Show Noisy Results
Do Not Show Results With Incomplete Data
Do Not Show Results With Little Change/Spread
List Notable Results
Show Result Confidence Charts
Allow Limiting Results To Certain Suite(s)

Statistics

Show Overall Harmonic Mean(s)
Show Overall Geometric Mean
Show Wins / Losses Counts (Pie Chart)
Normalize Results
Remove Outliers Before Calculating Averages

Graph Settings

Force Line Graphs Where Applicable
Convert To Scalar Where Applicable
Prefer Vertical Bar Graphs

Table

Show Detailed System Result Table

Run Management

Highlight
Result
Toggle/Hide
Result
Result
Identifier
View Logs
Performance Per
Dollar
Date
Run
  Test
  Duration
LLVM-Clang 3.0
June 06 2012
 
GCC 4.7
June 06 2012
 
Invert Behavior (Only Show Selected Data)
 
Only show results matching title/arguments (delimit multiple options with a comma):
Do not show results matching title/arguments (delimit multiple options with a comma):

LLVM-Clang 3.0

Processor: ARMv7 rev 10 @ 1.20GHz (2 Cores), Motherboard: OMAP4 Panda board, Memory: 1024MB, Disk: 16GB SD16G, Graphics: Texas Instruments OMAP

OS: Ubuntu 12.10, Kernel: 3.4.0-201-omap4 (armv7l), Desktop: Unity 2D 5.12.0, Display Server: X Server 1.11.3, Display Driver: fbdev 0.4.2, Compiler: Clang 3.0-6ubuntu3, File-System: ext4, Screen Resolution: 1920x1080

Processor Notes: Scaling Governor: ondemand

GCC 4.7

OS: Ubuntu 12.10, Kernel: 3.4.0-201-omap4 (armv7l), Desktop: Unity 2D 5.12.0, Display Server: X Server 1.11.3, Display Driver: fbdev 0.4.2, Compiler: GCC 4.7, File-System: ext4, Screen Resolution: 1920x1080

Compiler Notes: --build=arm-linux-gnueabihf --disable-libitm --disable-sjlj-exceptions --disable-werror --enable-checking=release --enable-clocale=gnu --enable-gnu-unique-object --enable-languages=c,c++,go,fortran,objc,obj-c++ --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-multilib --enable-nls --enable-objc-gc --enable-plugin --enable-shared --enable-threads=posix --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf --with-arch=armv7-a --with-float=hard --with-fpu=vfpv3-d16 --with-mode=thumb -v
Processor Notes: Scaling Governor: ondemand

LLVM-Clang On Ubuntu Linux ARMOpenBenchmarking.orgPhoronix Test SuiteARMv7 rev 10 @ 1.20GHz (2 Cores)OMAP4 Panda board1024MB16GB SD16GTexas Instruments OMAPUbuntu 12.103.4.0-201-omap4 (armv7l)Unity 2D 5.12.0X Server 1.11.3fbdev 0.4.2Clang 3.0-6ubuntu3GCC 4.7ext41920x1080ProcessorMotherboardMemoryDiskGraphicsOSKernelDesktopDisplay ServerDisplay DriverCompilersFile-SystemScreen ResolutionLLVM-Clang On Ubuntu Linux ARM BenchmarksSystem Logs- Scaling Governor: ondemand- GCC 4.7: --build=arm-linux-gnueabihf --disable-libitm --disable-sjlj-exceptions --disable-werror --enable-checking=release --enable-clocale=gnu --enable-gnu-unique-object --enable-languages=c,c++,go,fortran,objc,obj-c++ --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-multilib --enable-nls --enable-objc-gc --enable-plugin --enable-shared --enable-threads=posix --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf --with-arch=armv7-a --with-float=hard --with-fpu=vfpv3-d16 --with-mode=thumb -v

LLVM-Clang 3.0 vs. GCC 4.7 ComparisonPhoronix Test SuiteBaseline+14%+14%+28%+28%+42%+42%+56%+56%56.1%11.4%Total TimeA.C.PC.S.T10.2%C-RayTSCP7-Zip CompressionLLVM-Clang 3.0GCC 4.7

TSCP

OpenBenchmarking.orgNodes Per Second, More Is BetterTSCP 1.81AI Chess PerformanceGCC 4.7LLVM-Clang 3.016K32K48K64K80KSE +/- 31.40, N = 5SE +/- 27.65, N = 57424466660

7-Zip Compression

OpenBenchmarking.orgMIPS, More Is Better7-Zip Compression 9.20.1Compress Speed TestGCC 4.7LLVM-Clang 3.02004006008001000SE +/- 7.26, N = 3SE +/- 11.50, N = 38629501. (CXX) g++ options: -pipe -lpthread

C-Ray

This is a test of C-Ray, a simple raytracer designed to test the floating-point CPU performance. This test is multi-threaded (16 threads per core), will shoot 8 rays per pixel for anti-aliasing, and will generate a 1600 x 1200 image. Learn more via the OpenBenchmarking.org test page.

OpenBenchmarking.orgSeconds, Fewer Is BetterC-Ray 1.1Total TimeGCC 4.7LLVM-Clang 3.02004006008001000SE +/- 0.27, N = 3SE +/- 4.36, N = 3721.541126.291. (CC) gcc options: -lm -lpthread -O3 -march=armv7-a

LLVM-Clang 3.0

Processor: ARMv7 rev 10 @ 1.20GHz (2 Cores), Motherboard: OMAP4 Panda board, Memory: 1024MB, Disk: 16GB SD16G, Graphics: Texas Instruments OMAP

OS: Ubuntu 12.10, Kernel: 3.4.0-201-omap4 (armv7l), Desktop: Unity 2D 5.12.0, Display Server: X Server 1.11.3, Display Driver: fbdev 0.4.2, Compiler: Clang 3.0-6ubuntu3, File-System: ext4, Screen Resolution: 1920x1080

Processor Notes: Scaling Governor: ondemand

Testing initiated at 6 June 2012 11:35 by user phoronix.

GCC 4.7

Processor: ARMv7 rev 10 @ 1.20GHz (2 Cores), Motherboard: OMAP4 Panda board, Memory: 1024MB, Disk: 16GB SD16G, Graphics: Texas Instruments OMAP

OS: Ubuntu 12.10, Kernel: 3.4.0-201-omap4 (armv7l), Desktop: Unity 2D 5.12.0, Display Server: X Server 1.11.3, Display Driver: fbdev 0.4.2, Compiler: GCC 4.7, File-System: ext4, Screen Resolution: 1920x1080

Compiler Notes: --build=arm-linux-gnueabihf --disable-libitm --disable-sjlj-exceptions --disable-werror --enable-checking=release --enable-clocale=gnu --enable-gnu-unique-object --enable-languages=c,c++,go,fortran,objc,obj-c++ --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-multilib --enable-nls --enable-objc-gc --enable-plugin --enable-shared --enable-threads=posix --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf --with-arch=armv7-a --with-float=hard --with-fpu=vfpv3-d16 --with-mode=thumb -v
Processor Notes: Scaling Governor: ondemand

Testing initiated at 6 June 2012 14:54 by user phoronix.