ARMv7 Cortex A9 GCC 4.7 LTO Link-Time Optimizations
GCC 4.7 benchmarks of GCC 4.7.2 LTO. Testing the compiler link-time optimization performance with the -flto CFLAGS/CXXFLAGS. Benchmarking from a NVIDIA tegra 3 Cardhu quad-core ARM Cortex-A9 tablet. Benchmarking for future article on Phoronix by Michael Larabel.


Stock: 

	Processor: ARMv7 rev 9 @ 1.40GHz (4 Cores), Motherboard: cardhu, Memory: 1024MB, Disk: 16GB SEM16G + 32GB SD32G, Graphics: NVIDIA TEGRA, Network: Realtek RTL8111/8168B

	OS: Ubuntu 13.04, Kernel: 3.1.10-gfc993d9 (armv7l), Compiler: GCC 4.7, File-System: ext3, Screen Resolution: 1366x1536

GCC LTO: 

	Processor: ARMv7 rev 9 @ 1.40GHz (4 Cores), Motherboard: cardhu, Memory: 1024MB, Disk: 16GB SEM16G + 32GB SD32G, Graphics: NVIDIA TEGRA, Network: Realtek RTL8111/8168B

	OS: Ubuntu 13.04, Kernel: 3.1.10-gfc993d9 (armv7l), Compiler: GCC 4.7, File-System: ext3, Screen Resolution: 1366x1536


VP8 libvpx Encoding 1.1.0
vpxenc
Frames Per Second > Higher Is Better
Stock ... 0.40 |===============================================================
GCC LTO . 0.40 |===============================================================


GraphicsMagick 1.3.16
Operation: Blur
Iterations Per Minute > Higher Is Better
Stock ... 17 |==========================================================
GCC LTO . 19 |=================================================================


GraphicsMagick 1.3.16
Operation: Sharpen
Iterations Per Minute > Higher Is Better
Stock ... 15 |=============================================================
GCC LTO . 16 |=================================================================


GraphicsMagick 1.3.16
Operation: Resizing
Iterations Per Minute > Higher Is Better
Stock ... 25 |=================================================================
GCC LTO . 25 |=================================================================


GraphicsMagick 1.3.16
Operation: HWB Color Space
Iterations Per Minute > Higher Is Better
Stock ... 33 |==========================================================
GCC LTO . 37 |=================================================================


GraphicsMagick 1.3.16
Operation: Local Adaptive Thresholding
Iterations Per Minute > Higher Is Better
Stock ... 17 |=================================================================
GCC LTO . 17 |=================================================================


Timed ImageMagick Compilation 6.8.1-10
Time To Compile
Seconds < Lower Is Better
Stock ... 1123.07 |=========================================
GCC LTO . 1627.51 |============================================================


Timed PHP Compilation 5.2.9
Time To Compile
Seconds < Lower Is Better
Stock ... 492.43  |========================
GCC LTO . 1210.48 |============================================================


FLAC Audio Encoding 1.2.1
WAV To FLAC
Seconds < Lower Is Better
Stock ... 40.58 |==============================================================
GCC LTO . 40.65 |==============================================================


LAME MP3 Encoding 3.99.3
WAV To MP3
Seconds < Lower Is Better
Stock ... 93.26 |==============================================================
GCC LTO . 89.29 |===========================================================


FFmpeg 1.1
H.264 HD To NTSC DV
Seconds < Lower Is Better
Stock ... 354.36 |=============================================================
GCC LTO . 354.49 |=============================================================


Open FMM Nero2D 2.0.2
Total Time
Seconds < Lower Is Better
Stock ... 4374.94 |============================================================
GCC LTO . 4223.39 |==========================================================