LLVM Clang 3.2 vs. GCC 4.8 - Intel Ivy Bridge
Intel Core i7-3517UE Ivy Bridge quick comparison of LLVM 3.2 SVN and GCC 4.8 SVN as of 17 August 2012 for a quick future article on phoronix.com by Michael Larabel looking at the GCC vs. LLVM/Clang compiler performance on this latest Intel hardware.


LLVM 3.2 SVN 2012-08-17: 

	Processor: Intel Core i7-3517UE @ 2.10GHz (4 Cores), Motherboard: CompuLab Intense-PC, Chipset: Intel 3rd Gen Core DRAM, Memory: 8192MB, Disk: 500GB Hitachi HCC54755, Graphics: Intel 3rd Gen Core, Audio: Realtek ALC888, Monitor: VA2431, Network: Intel 82579LM Gigabit Connection + Realtek RTL8188CE 802.11b/g/n

	OS: Ubuntu 12.10, Kernel: 3.6.0-999-generic (x86_64), Desktop: Unity 2D 6.2.0, Display Server: X Server 1.12.1.902 (1.12.2 RC 2), Display Driver: intel 2.20.3, OpenGL: 2.1 Mesa 8.1-devel (git-6a3ac03), Compiler: Clang 3.2 (SVN 162102) + LLVM 3.2svn, File-System: ext4, Screen Resolution: 1920x1080

GCC 4.8.0 2012-08-17: 

	Processor: Intel Core i7-3517UE @ 2.10GHz (4 Cores), Motherboard: CompuLab Intense-PC, Chipset: Intel 3rd Gen Core DRAM, Memory: 8192MB, Disk: 500GB Hitachi HCC54755, Graphics: Intel 3rd Gen Core, Audio: Realtek ALC888, Monitor: VA2431, Network: Intel 82579LM Gigabit Connection + Realtek RTL8188CE 802.11b/g/n

	OS: Ubuntu 12.10, Kernel: 3.6.0-999-generic (x86_64), Desktop: Unity 2D 6.2.0, Display Server: X Server 1.12.1.902 (1.12.2 RC 2), Display Driver: intel 2.20.3, OpenGL: 2.1 Mesa 8.1-devel (git-6a3ac03), Compiler: GCC 4.8.0 20120817, File-System: ext4, Screen Resolution: 1920x1080


FFTE 5.0
Test: N=64, 1D Complex FFT Routine
MFLOPS > Higher Is Better
LLVM 3.2 SVN 2012-08-17 . 4174.48 |============================================
GCC 4.8.0 2012-08-17 .... 4144.41 |============================================


Timed HMMer Search 2.3.2
Pfam Database Search
Seconds < Lower Is Better
LLVM 3.2 SVN 2012-08-17 . 32.57 |==============================================
GCC 4.8.0 2012-08-17 .... 26.31 |=====================================


Timed MAFFT Alignment 6.864
Multiple Sequence Alignment
Seconds < Lower Is Better
LLVM 3.2 SVN 2012-08-17 . 15.58 |==============================================
GCC 4.8.0 2012-08-17 .... 13.60 |========================================


Timed MrBayes Analysis 3.1.2
Primate Phylogeny Analysis
Seconds < Lower Is Better
LLVM 3.2 SVN 2012-08-17 . 32.40 |==============================================
GCC 4.8.0 2012-08-17 .... 26.48 |======================================


John The Ripper 1.7.9
Test: Blowfish
Real C/S > Higher Is Better
LLVM 3.2 SVN 2012-08-17 . 721  |================
GCC 4.8.0 2012-08-17 .... 2102 |===============================================


VP8 libvpx Encoding 0.9.7-p1
vpxenc
Frames Per Second > Higher Is Better
LLVM 3.2 SVN 2012-08-17 . 13.94 |===========================================
GCC 4.8.0 2012-08-17 .... 14.79 |==============================================


Himeno Benchmark 3.0
Poisson Pressure Solver
MFLOPS > Higher Is Better
LLVM 3.2 SVN 2012-08-17 . 1170.53 |===========================================
GCC 4.8.0 2012-08-17 .... 1210.23 |============================================


7-Zip Compression 9.20.1
Compress Speed Test
MIPS > Higher Is Better
LLVM 3.2 SVN 2012-08-17 . 8261 |===============================================
GCC 4.8.0 2012-08-17 .... 7958 |=============================================


C-Ray 1.1
Total Time
Seconds < Lower Is Better
LLVM 3.2 SVN 2012-08-17 . 92.01 |==============================================
GCC 4.8.0 2012-08-17 .... 91.87 |==============================================


Smallpt 1.0
Global Illumination Renderer; 100 Samples
Seconds < Lower Is Better
LLVM 3.2 SVN 2012-08-17 . 205 |================================================
GCC 4.8.0 2012-08-17 .... 70  |================


Crafty 23.4
Elapsed Time
Seconds < Lower Is Better
LLVM 3.2 SVN 2012-08-17 . 99.85  |===========================================
GCC 4.8.0 2012-08-17 .... 103.38 |=============================================


LAME MP3 Encoding 3.99.3
WAV To MP3
Seconds < Lower Is Better
LLVM 3.2 SVN 2012-08-17 . 20.64 |==============================================
GCC 4.8.0 2012-08-17 .... 18.86 |==========================================


FFmpeg 0.10
AVI To NTSC VCD
Seconds < Lower Is Better
LLVM 3.2 SVN 2012-08-17 . 13.55 |==============================================


Minion 0.12
Benchmark: Bibd
Seconds < Lower Is Better
LLVM 3.2 SVN 2012-08-17 . 160.66 |=============================================
GCC 4.8.0 2012-08-17 .... 153.65 |===========================================


Minion 0.12
Benchmark: Graceful
Seconds < Lower Is Better
LLVM 3.2 SVN 2012-08-17 . 91.00 |============================================
GCC 4.8.0 2012-08-17 .... 94.20 |==============================================


Minion 0.12
Benchmark: Solitaire
Seconds < Lower Is Better
LLVM 3.2 SVN 2012-08-17 . 154.67 |=============================================
GCC 4.8.0 2012-08-17 .... 143.26 |==========================================


Minion 0.12
Benchmark: Quasigroup
Seconds < Lower Is Better
LLVM 3.2 SVN 2012-08-17 . 209.94 |=============================================
GCC 4.8.0 2012-08-17 .... 204.23 |============================================


OpenSSL 1.0.0e
RSA 4096-bit Performance
Signs Per Second > Higher Is Better
LLVM 3.2 SVN 2012-08-17 . 70.90 |=============================================
GCC 4.8.0 2012-08-17 .... 71.70 |==============================================


NGINX Benchmark 1.0.11
Static Web Page Serving
Requests Per Second > Higher Is Better
LLVM 3.2 SVN 2012-08-17 . 23429.56 |===========================================
GCC 4.8.0 2012-08-17 .... 22927.29 |==========================================


Apache Benchmark 2.2.21
Static Web Page Serving
Requests Per Second > Higher Is Better
LLVM 3.2 SVN 2012-08-17 . 16978.74 |===========================================
GCC 4.8.0 2012-08-17 .... 16801.78 |===========================================