LLVM Clang vs. GCC On ARM Cortex-A15
ARM Cortex-A15 compiler benchmarks of GCC 4.6, 4.7, and 4.8 compared to LLVM/Clang 3.0 on the Samsung Chromebook with Samsung Exynos 5 Dual. Benchmarks for a future article on Phoronix.com.


GCC 4.6.3: 

	Processor: Exynos ARMv7 rev 4 @ 1.70GHz (2 Cores), Motherboard: SAMSUNG EXYNOS5 (Flattened Device Tree), Memory: 2048MB, Disk: 16GB SEM16G

	OS: Ubuntu 12.04, Kernel: 3.4.0 (armv7l), Desktop: Unity 2D 5.16.0, Display Server: X Server 1.11.3, Compiler: GCC 4.6, File-System: ext4, Screen Resolution: 1366x768

GCC 4.7.2: 

	Processor: Exynos ARMv7 rev 4 @ 1.70GHz (2 Cores), Motherboard: SAMSUNG EXYNOS5 (Flattened Device Tree), Memory: 2048MB, Disk: 16GB SEM16G

	OS: Ubuntu 12.04, Kernel: 3.4.0 (armv7l), Desktop: Unity 2D 5.16.0, Display Server: X Server 1.11.3, Compiler: GCC 4.7, File-System: ext4, Screen Resolution: 1366x768

GCC 4.8.0 SVN: 

	Processor: Exynos ARMv7 rev 4 @ 1.70GHz (2 Cores), Motherboard: SAMSUNG EXYNOS5 (Flattened Device Tree), Memory: 2048MB, Disk: 16GB SEM16G

	OS: Ubuntu 12.04, Kernel: 3.4.0 (armv7l), Desktop: Unity 2D 5.16.0, Display Server: X Server 1.11.3, Compiler: GCC 4.8.0 20121008, File-System: ext4, Screen Resolution: 1366x768

LLVM Clang 3.0: 

	Processor: Exynos ARMv7 rev 4 @ 1.70GHz (2 Cores), Motherboard: SAMSUNG EXYNOS5 (Flattened Device Tree), Memory: 2048MB, Disk: 16GB SEM16G

	OS: Ubuntu 12.04, Kernel: 3.4.0 (armv7l), Desktop: Unity 2D 5.16.0, Display Server: X Server 1.11.3, Compiler: Clang 3.0-6ubuntu3, File-System: ext4, Screen Resolution: 1366x768


Timed HMMer Search 2.3.2
Pfam Database Search
Seconds < Lower Is Better
GCC 4.6.3 ...... 124.30 |===================================================
GCC 4.7.2 ...... 114.98 |===============================================
GCC 4.8.0 SVN .. 124.65 |===================================================
LLVM Clang 3.0 . 131.65 |======================================================


Timed MrBayes Analysis 3.1.2
Primate Phylogeny Analysis
Seconds < Lower Is Better
GCC 4.6.3 ...... 201.62 |================================================
GCC 4.7.2 ...... 200.22 |================================================
GCC 4.8.0 SVN .. 197.95 |===============================================
LLVM Clang 3.0 . 226.50 |======================================================


GraphicsMagick 1.3.16
Operation: Blur
Iterations Per Minute > Higher Is Better
GCC 4.6.3 ...... 32 |==========================================================
GCC 4.7.2 ...... 32 |==========================================================
GCC 4.8.0 SVN .. 32 |==========================================================
LLVM Clang 3.0 . 19 |==================================


GraphicsMagick 1.3.16
Operation: Sharpen
Iterations Per Minute > Higher Is Better
GCC 4.6.3 ...... 23 |==========================================================
GCC 4.7.2 ...... 23 |==========================================================
GCC 4.8.0 SVN .. 23 |==========================================================
LLVM Clang 3.0 . 11 |============================


GraphicsMagick 1.3.16
Operation: Resizing
Iterations Per Minute > Higher Is Better
GCC 4.6.3 ...... 40 |==========================================================
GCC 4.7.2 ...... 40 |==========================================================
GCC 4.8.0 SVN .. 40 |==========================================================
LLVM Clang 3.0 . 22 |================================


GraphicsMagick 1.3.16
Operation: HWB Color Space
Iterations Per Minute > Higher Is Better
GCC 4.6.3 ...... 50 |==========================================================
GCC 4.7.2 ...... 47 |=======================================================
GCC 4.8.0 SVN .. 47 |=======================================================
LLVM Clang 3.0 . 39 |=============================================


GraphicsMagick 1.3.16
Operation: Local Adaptive Thresholding
Iterations Per Minute > Higher Is Better
GCC 4.6.3 ...... 22 |=======================================================
GCC 4.7.2 ...... 23 |==========================================================
GCC 4.8.0 SVN .. 23 |==========================================================
LLVM Clang 3.0 . 13 |=================================


C-Ray 1.1
Total Time
Seconds < Lower Is Better
GCC 4.6.3 ...... 435.43 |==============================================
GCC 4.7.2 ...... 313.32 |=================================
GCC 4.8.0 SVN .. 313.27 |=================================
LLVM Clang 3.0 . 508.53 |======================================================


Primesieve 4.0
1e12 Prime Number Generation
Seconds < Lower Is Better
GCC 4.6.3 ...... 883.94  |===============================
GCC 4.7.2 ...... 866.18  |==============================
GCC 4.8.0 SVN .. 886.19  |===============================
LLVM Clang 3.0 . 1507.90 |=====================================================