1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

FX-8350 Piledriver Tuning On AMD's Open64 Compiler

Michael Larabel

Published on 24 October 2012
Written by Michael Larabel
Page 1 of 4 - 1 Comment

With this week's unveiling of the FX-8350 eight-core processor being based on AMD's new Piledriver architecture, in this article are benchmarks when testing out the Piledriver "bdver2" optimizations within AMD's own Open64 compiler.

Back in August was when AMD released the AMD Open64 4.5.2 compiler, which introduced support for Family 15h Piledriver cores. With the Piledriver support came work within AMD's Open64 compiler fork for handling AVX, XOP, FMA3, FMA4, BMI, TBM, and F16C instruction sets.

From the features list for the Open64 4.5.2 release, "You can enable this new instructions in Piledriver core using the -march=bdver2. Alternately you can pick and choose the ISA to be enabled using -mfma (for FMA3), -mfma4, -mbmi, -mtbm flags." The "bdver2" target is the same as is used by GCC and LLVM/Clang for supporting the second-generation Bulldozer -- a.k.a. Piledriver -- AMD processors.

Earlier this month I did do some GCC compiler tuning tests for the Piledriver-based AMD A10-5800K Trinity APU. With the GCC testing of comparing the bdver2 micro-architecture support against bdver1 and other earlier AMD CPU targets, there wasn't much improvement out of using "-march=bdver2" when compiling the test application / benchmark binaries.

In the GCC Piledriver tuning tests from last week with GCC 4.7.2 I went over what the bdver2 target adds: BMI, TBM, F16C, and FMA3. FMA3 is a three operand variant (that's being pushed by Intel with Haswell) of Fused Multiply-Add rather than the four operand version, F16C allows for converting and storing 32-bit floating point values using 16-bits, TBM is Trailing Bit Manipulation, and BMI is Bit Manipulation Instructions.

From the AMD FX-8350 Eight-Core "Vishera" setup running Ubuntu 12.10 with the Linux 3.5 kernel, AMD's official 64-bit Open64 4.5.2 compiler was tested. Each time this compiler built the Phoronix Test Suite collection of tests while passing each time a different "-march=" value of k8, barcelona, bdver1, and then bdver2.

<< Previous Page
1
Latest Linux Hardware Reviews
  1. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  2. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
  3. AMD Radeon R9 285 Tonga Performance On Linux
  4. Apotop Wi-Copy
Latest Linux Articles
  1. AMD Moves Forward With Unified Linux Driver Strategy, New Kernel Driver
  2. MSI: Update Your BIOS From The Linux Desktop
  3. NVIDIA vs. AMD 2D Linux Drivers: Catalyst Is Getting Quite Good At 2D
  4. 15-Way GPU Comparison With Mesa 10.3 + Linux 3.17
Latest Linux News
  1. Linux 3.18-rc1 Released One Week Early With Many Changes
  2. The VC4 Gallium3D Driver Is Still Moving Along For The Raspberry Pi
  3. Direct3D 9 Support Might Land Within Mainline Mesa 3D Drivers
  4. OpenGL Preview Benchmarks For NVIDIA's GeForce GTX 970
  5. HOPE: The Ease Of Python With The Speed Of C++
  6. Vitesse: Using LLVM To Speed Up Databases
  7. AMD Is Restructuring Again, Losing 7% Of Employees
  8. Linux Testing Of The NVIDIA GeForce GTX 970
  9. Qt 5.4 Now In Beta With Web, Bluetooth LE, Graphics Improvements
  10. AMD's Radeon R9 285 On Linux Offers Good OpenCL Performance
Latest Forum Discussions
  1. AMD Is Restructuring Again, Losing 7% Of Employees
  2. Bye bye BSD, Hello Linux: A Sys Admin's Story
  3. NVIDIA Presents Its Driver Plans To Support Mir/Wayland & KMS On Linux
  4. Open-Source AMD Fusion E-350 Support Takes A Dive
  5. Upgrade to Kaveri, very slow VDPAU performance
  6. ChromeOS Drops Support For EXT2/EXT3/EXT4 File-Systems
  7. Lennart Poettering On The Open-Source Community: A Sick Place To Be In
  8. The Slides Announcing The New "AMDGPU" Kernel Driver