GCC, LLVM/Clang 3.0, Open64 Compiler
Compiler performance benchmarking of GCC 4.6.2 RC, LLVM 3.0, and latest Open64 from AMD. All phoronix test suite benchmarks were built with CFLAGS/CXXFLAGS of -march=native and -mtune=native under each compiler. Tests by Michael Larabel for a future Phoronix.com article.


GCC 4.6.2-RC-20111019: 

	Processor: 2 x AMD Opteron 2384 @ 2.70GHz (8 Cores), Motherboard: TYAN S2932/S2932-E, Chipset: NVIDIA MCP55, Memory: 4096MB, Disk: 165GB Western Digital WD1600YS-01S + 128GB ity, Graphics: ATI Device 9456, Audio: ATI R6xx HDMI, Monitor: DELL S2409W

	OS: Ubuntu 11.10, Kernel: 3.0.0-12-generic (x86_64), Desktop: Unity 4.22.0, Display Server: X Server 1.10.4, Display Driver: radeon 6.14.99, OpenGL: 2.1 Mesa 7.11 Gallium 0.4, Compiler: GCC 4.6.2, File-System: ext4, Screen Resolution: 1920x1080

LLVM/Clang 3.0-RC1: 

	Processor: 2 x AMD Opteron 2384 @ 2.70GHz (8 Cores), Motherboard: TYAN S2932/S2932-E, Chipset: NVIDIA MCP55, Memory: 4096MB, Disk: 165GB Western Digital WD1600YS-01S, Graphics: ATI Device 9456, Audio: ATI R6xx HDMI, Monitor: DELL S2409W

	OS: Ubuntu 11.10, Kernel: 3.0.0-12-generic (x86_64), Desktop: Unity 4.22.0, Display Server: X Server 1.10.4, Display Driver: radeon 6.14.99, OpenGL: 2.1 Mesa 7.11 Gallium 0.4, Compiler: Clang 3.0 + LLVM 3.0, File-System: ext4, Screen Resolution: 1920x1080

AMD Open64 4.2.5.2: 

	Processor: 2 x AMD Opteron 2384 @ 2.70GHz (8 Cores), Motherboard: TYAN S2932/S2932-E, Chipset: NVIDIA MCP55, Memory: 4096MB, Disk: 165GB Western Digital WD1600YS-01S, Graphics: ATI Device 9456, Audio: ATI R6xx HDMI, Monitor: DELL S2409W

	OS: Ubuntu 11.10, Kernel: 3.0.0-12-generic (x86_64), Desktop: Unity 4.22.0, Display Server: X Server 1.10.4, Display Driver: radeon 6.14.99, OpenGL: 2.1 Mesa 7.11 Gallium 0.4, Compiler: Open64 4.2.5.2, File-System: ext4, Screen Resolution: 1920x1080


C-Ray 1.1
Total Time
Seconds < Lower Is Better
GCC 4.6.2-RC-20111019 . 63.01 |=============================================
LLVM/Clang 3.0-RC1 .... 67.01 |================================================
AMD Open64 4.2.5.2 .... 27.89 |====================


Smallpt 1.0
Global Illumination Renderer; 100 Samples
Seconds < Lower Is Better
GCC 4.6.2-RC-20111019 . 114 |======
LLVM/Clang 3.0-RC1 .... 974 |==================================================


7-Zip Compression 9.13
Compress Speed Test
MIPS > Higher Is Better
GCC 4.6.2-RC-20111019 . 16101 |================================================
AMD Open64 4.2.5.2 .... 16197 |================================================


OpenSSL 1.0.0a
RSA 4096-bit Performance
Signs Per Second > Higher Is Better
GCC 4.6.2-RC-20111019 . 51.48 |================================================
LLVM/Clang 3.0-RC1 .... 51.13 |================================================


John The Ripper 1.7.8
Test: Traditional DES
Real C/S > Higher Is Better
GCC 4.6.2-RC-20111019 . 1992333 |=======================================
LLVM/Clang 3.0-RC1 .... 2362667 |==============================================
AMD Open64 4.2.5.2 .... 2354000 |==============================================


John The Ripper 1.7.8
Test: MD5
Real C/S > Higher Is Better
GCC 4.6.2-RC-20111019 . 12253 |================================================
LLVM/Clang 3.0-RC1 .... 11399 |=============================================
AMD Open64 4.2.5.2 .... 7139  |============================


John The Ripper 1.7.8
Test: Blowfish
Real C/S > Higher Is Better
GCC 4.6.2-RC-20111019 . 806 |==================================================
LLVM/Clang 3.0-RC1 .... 660 |=========================================
AMD Open64 4.2.5.2 .... 672 |==========================================


Timed MAFFT Alignment 6.706
Multiple Sequence Alignment
Seconds < Lower Is Better
GCC 4.6.2-RC-20111019 . 36.00 |=============================================
LLVM/Clang 3.0-RC1 .... 38.24 |================================================
AMD Open64 4.2.5.2 .... 34.73 |============================================